Page 1
STRATIGRAPHY OF BURGER J (OCS-Y-2321), BLOCK 6912,
CHUKCHI SEA
FEBRUARY 2016
Jonathan Bujak, Bujak Research Ltd: palynology
Paul Connell: micropaleontology
Malcolm Jones, Palynological Laboratory Services Ltd: sample processing
www.bujakresearch.com
PROPRIETARY
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Burger J biostratigraphy page 1
STRATIGRAPHY OF BURGER J (OCS-Y-2321), BLOCK 6912,
CHUKCHI SEA
TABLE OF CONTENTS
1. INTRODUCTION ........................................................................................................ 3
1.1 Material and methods .......................................................................................... 3
1.2 Biostratigraphic zonation .................................................................................... 4
1.3 Report format ...................................................................................................... 6
2. SUMMARY OF RESULTS ......................................................................................... 7
2.1 Palynological zonation ........................................................................................ 7
2.2 Micropaleontological assemblages ..................................................................... 8
3. BIOSTRATIGRAPHIC RESULTS .......................................................................... 10
3.1 Introduction ....................................................................................................... 10
3.2 Biostratigraphic subdivision ............................................................................. 11
4. LITHOSTRATIGRAPHIC PICKS .......................................................................... 29
5 SAMPLES ANALYSED ............................................................................................ 30
6. REFERENCES AND SELECTED SOURCES ........................................................ 31
7. APPENDIX A .............................................................................................................. 36
Species occurrence charts
PROPRIETARY
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Burger J biostratigraphy page 2
FIGURES
Figure 1 Northern Alaskan and Chukchi Sea Jurassic - Cretaceous palynological zones of
Bujak Research International (2003a, b) plotted against the ICS 2012 time scale.
Note the local subdivision of Zone K6 in the Chukchi Sea.
Figure 2 Late Aptian to Cenomanian Arctic zonation showing Albian subzones and their
calibration with North Sea and northwest European stages and ammonite zones.
RANGE CHARTS (APPENDIX A)
Micropaleontological range chart in StrataBugs format: Plot showing lithostratigraphy, age,
palynological zones and micropaleontological assemblages, plus interpreted depositional
environments. Taxa are arranged by highest occurrence (tops) within major groups.
Palynological range chart in StrataBugs format: Plot showing lithostratigraphy, age,
palynological zones and micropaleontological assemblages, plus interpreted depositional
environments. Taxa are arranged by highest occurrence (tops) within major groups.
PROPRIETARY
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Burger J biostratigraphy page 3
1. INTRODUCTION
The Burger J well is located on lease OCS-Y-2321, Block 6912, in the Chukchi Sea. It was
drilled on the Burger J prospect by the "Polar Pioneer" semi-submersible drilling rig and spudded
at approximately 71° 10' 24.03"N, 163° 28' 18.522"W on 30th July 2015. Total depth was reached
at 6800 ft in the last week of September 2015 (public information and press releases from Shell
Gulf of Mexico Inc.).
1.1 MATERIAL AND METHODS
Material
This report is based on micropaleontological and palynological analysis of 100 composite
cuttings samples, which were selected by the operator between 1512 ft and 6800 ft (TD).
Analyzed samples are listed in Section 5 of this report.
All depths in the report are based on depths listed on the sample bags. These are assumed to
indicate depth below the drill floor, which was 76 ft above mean sea level (BSEE daily reports,
public version).
In this report, the North American convention of using the top of the marked depth on the sample
bag as the reference point is followed. The "top" event can therefore be no higher in the well than
the top sample depth marked on the bag, but the actual "top" could occur at an intermediate depth
down to the bottom depth marked on the sample bag.
Processing and analysis
Samples were processed for palynology and micropaleontology by Malcolm Jones at
Palynological Laboratory Services Ltd in North Wales.
Micropaleontological fossil picking and analysis were undertaken by Paul Connell. Palynological
analysis was undertaken by Jonathan Bujak. No other biostratigraphic consultants or technical
staff were involved in any aspect of this work.
PROPRIETARY
Page 5
70
95
105
90
80
85
66
75
100
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
185
190
195
200
205
Figure 1. Northern Alaskan and Chukchi Sea Jurassic - Cretaceous palynological zones of Bujak Research International(2003a, b) plotted against the ICS 2012 time scale. Note the local subdivision of Zone K6 in the Chukchi Sea..
66.0
72.1
83.6
86.3
89.893.9
100.5
113.0
125.0
129.4
132.5
145.0
152.1
157.3
163.5
166.1
168.3170.3
66
174.1
66
182.7
66
190.8
66
201.3
139.8
66
199.3
EA
RLY
JU
RA
SS
IC
Maastrichtian
Campanian
Santonian
Coniacian
Turonian
Cenomanian
Albian
Aptian
Barremian
Hauterivian
Valanginian
Kimmeridigian
Oxfordian
Callovian
BathonianBajocianAalenian
Toarcian
Pliensbachian
Sinemurian
Hettangian
MID
DLE
JUR
AS
SIC
LATE
JUR
AS
SIC
EA
RLY
CR
ETA
CE
OU
SLA
TE C
RE
TAC
EO
US
Tithonian /Volgian s.l.
Berriasian
K15
CHUKCHI SEA
K14
K13K12
K11
K10K9
K8
K7
K6
K5
K4
K3
K2
K1
J9
J8
J7
J6
b
J4
J3
J2
J1
Isabelidinium amphiatum
Heterosphaeridium difficile
Chatangiella coronata
Chatangiella ditissima
Chatangiella verrucosa
Eurydinium glomeratum
Bacchidinium polypes
Gardodinium trabeculosum
Oligospheridium asterigerum
Muderongia asymmetrica
Aptea anaphrissa
Gochteodinia villosa
Gochteodinia judilentinae
Horologinella spinosigibberosa
Densoisporites velatus
Hystrichogonyaulax cladophora
Tubotuberella eisenackii
Ctenidodinium sellwoodii
Nannoceratopsis gracile
Phallocysta eumekes
Comparodinium perpunctatum
Dapcodinium priscum
TIM
E (M
a) AGE
(2012 INTERNATIONALCHRONOSTRATIGRAPHIC
CHART) SE
QU
EN
CE
BR
OO
KIA
NE
LLE
SM
ER
IAN
Cyclonephelium distinctum
Gonyaulacysta jurassica
Rhaetian
a
Teaniaesporites rhaeticus TrL3
J5
ba
cde
ba
bc
a(ii)a(i)
ba
K15
NORTHERN ALASKA
K14
K13K12
K11
K10K9
K8
K7
K6
K5
K4
K3
K2
K1
J9
J8
J7
J6
b
J4
J3
J2
J1
Isabelidinium amphiatum
Heterosphaeridium difficile
Chatangiella coronata
Chatangiella ditissima
Chatangiella verrucosa
Eurydinium glomeratum
Bacchidinium polypes
Gardodinium trabeculosum
Oligospheridium asterigerum
Muderongia asymmetrica
Aptea anaphrissa
Gochteodinia villosa
Gochteodinia judilentinae
Horologinella spinosigibberosa
Densoisporites velatus
Hystrichogonyaulax cladophora
Tubotuberella eisenackii
Ctenidodinium sellwoodii
Nannoceratopsis gracile
Phallocysta eumekes
Comparodinium perpunctatum
Dapcodinium priscum
Cyclonephelium distinctum
Gonyaulacysta jurassica
a
Teaniaesporites rhaeticus TrL3
J5
ba
cde
ba
bc
a(ii)a(i)
ba
b
a
PROPRIETARY
Page 6
ARCTIC ZONE *
ARCTIC SUBZONE *
NORTH SEA DINO ZONE **
NORTH SEA MFS AMMONITE ZONE
ABSOLUTE AGE (Ma) (Gradstein et
al. 2012)STAGE
top occurrence Epiplosphaera spinosa 96.7top occurrence Senoniasphaera 'reticulata'
top occurrence Sidridinium borealis
top occurrence Ovoidinium scabrosum 100.5top occurrence Aptea polymorpha
top sporadic Dingodinium cerviculum [A]
top consistent Cyclonephelium brevispinosum
top occurrence Chichaouadinium vestitum [A]
top consistent Senoniasphaera microreticulata [A]
top occurrence Luxadinium propatulum [A]
top occurrence Pseudoceratium / Endoceratium turneri
top common Pterodinium grande ALB16 MFS 103.0top occurrence Litosphaeridium arundum
top occurrence Gonyaulacysta cretacea / helicoidea [A]
top influx Litosphaeridium siphoniphorum
top occurrence Leptodinium modicum [A]
top occurrence Leptodinium? hyalodermopsis [A]
top occurrence Lunatadinium dissolutum [A]
top occurrence Protoellipsodinium spinocristatum
top occurrence Endoscrinium turneri 106.4top occurrence Endoscrinium rostratum [A]
top occurrence Carpodinium granulatum
top occurrence common / consistent Luxadinium primulum [A]
top consistent Oligosphaeridium totum totum [A]
top frequent Cribroperidinium edwardsii
top occurrence Odontochitina singhii
top influx Oligosphaeridium complex
top base Litosphaeridium siphoniphorum
top occurrence Apteodinium granulatum
top occurrence Apteodinium grande
top occurrence Scriniodinium heikei 107.0top occurrence Systematophora cretacea
top occurrence Gardodonium trabeculosum [A]
top occurrence Ellipsoidictyum imperfectum
top occurrence Cauca parva
top occurrence Pseudoceratium expolitum [A] 107.6top occurrence Cyclonephelium brevispinosum 'extremum' [A]
top occurrence Pseudoceratium retusum [A]
top influx Systematophora silyba
top occurrence Microdinium opacum [A] 108.2top occurrence Microdinium setosum
top occurrence Tehamadinium tenuiceras
top occurrence Leptodinium cancellatum [A]
top occurrence Stephodinium spinulosum
top occurrence Impagidinium verrucosum [A] 108.8top occurrence Escharisphaeridia rudis [A]
top occurrence Kleithriasphaeeridium simplicispinosum ALB5 110.8top occurrence Occisucysta tentoria
top occurrence Impagidinium alectrolophum
top influx Ellipsoidictyum imperfectum
top occurrence Kiokansium prolatum 112.0top occurrence Cyclonephelium compactum (extreme ornament)
top influx Cauca parva
top common Kiokansium prolatum
top common Kiokansium polypes
top occurrence Ellipsoidictyum inaffectum subsp. elongataum
base common Surculosphaeridium longifurcatum
top occurrence Occisucysta echinata
top occurrence Dingodinium albertii
top occurrence Aldorfia vectensis
top occurrence Protoellipsodinium clavulum 113.0top occurrence Achomosphaera verdieri
top occurrence Cerbia tabulata
** Arctic zonation (Bujak Research International 2003a, b) * North Sea scheme of Duxbury (2001) renamed with alphanumeric notation
Figure 2. Late Aptian to Cenomanian Arctic zonation showing Albian subzones and theit calibration with North Sea and northwest European stages and ammonite zones.
INFLATUM
ALB12
ALB7
ALB9
DINOCYST BIOEVENT (Note: [1] not all bioevents occur in both the North Sea and Arctic regions; [2] some bioevents show minor diachronism between the two regions;
[A] indicates Arctic range
K8A K8A CEN1
ALB13
ALB11
MFS
EARLY CENOMANIAN
ALB17
DISPAR
LATE ALBIAN
ALB15
ALB10
MANTELLI
LAUTUS
MIDDLE ALBIAN
DENTATUS
K7
MAMILLATUM
K7
ALB14
LATE K7C
LATE K7B
ALB8
LORICATUS
ALB6
LATE APTIANK6 K6C APT18 JACOBI
EARLY ALBIAN
ALB4
TARDEFURCATA
ALB3
ALB2
ALB1
EARLY K7C
LATE K7A
EARLY K7A
LATE K7E
EARLY K7E
LATE K7D
EARLY K7D
EARLY K7BPROPRIETARY
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Burger J biostratigraphy page 4
1.2 BIOSTRATIGRAPHIC ZONATION
Mesozoic (Figure 1)
During the Triassic to Maastrichtian, the Arctic Ocean was connected to the Pacific Ocean,
permitting continuous interchange of marine fauna between the two oceans. Relatively low
latitudinal thermal gradients of the greenhouse climate also resulted in warmer Arctic air and sea-
surface temperatures (SST) than those of the present bipolar icehouse climate. Arctic Mesozoic
strata therefore contain abundant populations of dinoflagellates, which were the major
phytoplankton during this time.
The Arctic Ocean was centred on the North Pole throughout most of the Mesozoic, enabling an
Arctic Basin-wide scheme for the Arctic, except for the Oligocene to Recent of the Barents Sea
which was influenced by warmer waters of the Gulf Stream.
The Mesozoic Arctic Ocean was fringed by land inhabited by diverse plant communities, as
indicated by the presence of abundant pollen and spores in many Arctic and circum-Arctic
sediments. The Mesozoic palynological zonal scheme used in this report is therefore based on a
combination of dinoflagellates, pollen and spores, but with marine taxa providing most of the
zonal markers as they are less prone to local facies control and diachronism.
Arctic dinoflagellate assemblages include several distinctive endemic populations, plus more
cosmopolitan taxa that permit correlation into lower latitudes and calibration of the Arctic zones
with absolute time. The zonal scheme used in this report is summarised in Figures 1 and 2, based
on extensive analysis of wells and surface sections by Jonathan Bujak (Bujak Research
International, 2003a, b). Several Mesozoic zones are subdivided into subzones, with Albian
subzones being particularly significant to the present study,
Albian Subzones (Figure 2)
The Albian Gardodinium trabeculosum Zone (K7) is subdivided into five subzones. Most of the
taxa that define the subzones are dinoflagellate cysts that have relatively wide geographic
distribution. The stratigraphic ranges of these species can therefore be compared with those in
northwest Europe (e.g., Duxbury 2001), and there is sufficient similarity to permit correlation
PROPRIETARY
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Burger J biostratigraphy page 5
with northwest European Ammonite zones. Some of the Alaskan biomarkers have slightly
different stratigraphic ranges from their North Sea / northwest European distribution and these
are noted in Figure 2.
Foraminifera
Despite the long history of micropaleontological analyses undertaken in Alaska and the adjacent
Beaufort-Mackenzie and Sverdrup basins, no comprehensive microfossil zonation scheme for the
Lower Cretaceous strata has been published.
The early monograph reports of Tappan (1962) and Bergquist (1966) largely neglected the pre-
Albian strata in Alaska and there have been no further detailed publications. Detailed research in
the Yukon and Sverdrup basins by Chamney (1969, 1971, 1978), Fowler and Braun (1993),
Hedinger (1994), Souaya (1976) and Wall (1983) have resulted in well-illustrated monographs
with modern foraminiferal taxonomy.
The large compilation of biostratigraphic data from many Alaskan wells, including all of those in
the Chukchi Sea, by Mickey et al. (2006) utilised a system of F-Zones to subdivide the
micropaleontological succession. Unfortunately the microfossil taxonomy remained unrevised
from the original analytical work in the early 1990's and the defining details of the zones were
never published. Our review of their well data was unable to recognise consistent criteria for the
definition of the F-Zones.
The taxonomy utilised in this report draws on the compilations mentioned above as well as the
available Russian literature (Dain, 1972; Bulynnikova et al., 1990) which deals with the,
frequently rich, microfossiliferous Barremian to Volgian strata of the northern basins of Siberia.
The assemblages, which have been recognised in this well are based on the characteristic
microfossils from each interval, are tabulated in Section 2 of this report. These assemblages
mainly reflect the lithostratigraphy, so that they have limited chronostratigraphic significance.
PROPRIETARY
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Burger J biostratigraphy page 6
1.3 REPORT FORMAT
The report is divided into the following six sections and Appendix A.
• Section 1 discussed the examined material and methodology.
• Biostratigraphic results of the study are summarised in Section 2 and include a four-fold
degree of confidence for each zonal assignment that ranges from 1 (highest) to 4 (lowest).
• Section 3 documents the biostratigraphic subdivision of the well in more detail, including lists
of the bioevents used to recognise individual zones and subzones, plus environmental
interpretations.
• Section 4 lists the lithostratigraphic subdivision of the well based on the biostratigraphic
succession. Depths are approximate because well logs were not provided for the study.
• Section 5 tabulates the examined samples and their paleontological analyses.
• Section 6 lists an abbreviated bibliography.
• Micropaleontological and palynological range charts are provided in Appendix A.
PROPRIETARY
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Burger J biostratigraphy page 7
2. SUMMARY OF RESULTS: BURGER J (OCS-Y-2321)
2.1 PALYNOLOGICAL ZONATION: BURGER J (OCS-Y-2321)
1512 ft highest examined sample
1512-3480 ft Gardodinium trabeculosum Zone K7 (Albian) [1]
• 1512-1590 ft Subzone K7d (late Albian) [2]
• 1590-1950 ft Subzone K7c (middle Albian) [3]
• 1950-3210 ft Subzone K7b (middle Albian) [3]
• 3210-3480 ft Subzone K7a (early Albian) [3]
3480-5280 ft Oligosphaeridium asterigerum Zone K6 (Aptian) [2]
• 3480-3930 ft Subzone K6b (late Aptian) [2]
• 3930-5280 ft Subzone K6a (late part of the Early Aptian) [4]
-------------- 5280 FT (APPROXIMATE): BROOKIAN UNCONFORMITY----------------
5280-5790 ft Aptea anaphrissa Zone K4 (late Hauterivian to Barremian) [2] with
common reworked K2 (Valanginian) taxa
------- 5790 FT (APPROXIMATE): LOWER CRETACEOUS UNCONFORMITY-------
5790-6570 ft Gochteodinia judilentinae Zone K2 (Valanginian) [2]
6570-6800 ft (TD) Horologinella spinosigibberosa Zone K1 (Berriasian) [3]
PROPRIETARY
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Burger J biostratigraphy page 8
2.2 MICROPALEONTOLOGICAL ASSEMBLAGES: BURGER J (OCS-Y-2321)
1512 ft highest examined sample
1512-1590 ft no assemblage recognisable
1590-2130 ft megaspores
2130-3930 ft Haplophragmoides topagorukensis / Gaudryina tailleuri
3930-4980 ft Bathysiphon brosgei
4980-5280 ft radiolaria
-------------- 5280 FT (APPROXIMATE): BROOKIAN UNCONFORMITY----------------
5280-5790 ft Recurvoides ex gr. stschekuriensis / Haplophragmoides concavus
------- 5790 FT (APPROXIMATE): LOWER CRETACEOUS UNCONFORMITY-------
5790-5850 ft no assemblage recognisable
5850-6050 ft Glomospira / Haplophragmoides
6050-6570 ft Cribrostomoides infracretaceous / Labrospira goodenoughensis
6050-6080 ft Recurvoides sub-assemblage
6080-6140 ft Epistomina caracolla anterior sub-assemblage
6140-6290 ft Verneuilinoides neocomiensis sub-assemblage
6290-6570 ft Trochammina / Gaudryina sub-assemblage
6570-6800 ft (TD) Cribrostomoides canui
6630-6800 ft Ostracods / Pseudolamarckina sub-assemblage
PROPRIETARY
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Burger J biostratigraphy page 9
NOTES
1. The base of each zonal interval is listed down to the top of the highest sample assigned to the
underlying zone, consistent with other Bujak Research Arctic reports. It is possible that the
horizon occurs in the gap between the examined samples.
2. The degree of confidence is shown in square brackets [1-4] after each zonal assignment:
• Confidence level 1: highest confidence level
• Confidence level 2: medium confidence level
• Confidence level 3: lower confidence level
• Confidence level 4: lowest confidence level
PROPRIETARY
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Burger J biostratigraphy page 10
3. BIOSTRATIGRAPHIC RESULTS: BURGER J (OCS-Y-2321)
3.1 INTRODUCTION
1. This section of the report discusses the biostratigraphic succession interpreted from the
palynological and micropaleontological data shown on four range charts in Appendix A.
2. The zonal subdivision of the well is documented below in order of increasing downhole
depth, using the Bujak Research International zonal scheme shown in Figures 1 and 2.
3. The base of each zonal and subzonal interval is listed down to the highest sample assigned to
the underlying zone.
4. A confidence level is assigned to each zone in square brackets from 1 (highest) to 4 (lowest).
Each zonal bioevent listed within each zone or subzone is followed by the type of microfossil
in curved brackets, i.e., Palynomorphs (P): (A) algae, (D) dinocysts, (F) fungi and (S) spores
and pollen. Microfauna: (F) foraminifera, (O) ostracoda, (R) radiolaria (M) miscellaneous
microfossils and minerals.
5. Age-diagnostic species and other significant taxa are listed for each zone and subzone in
order of their highest occurrence observed in the well.
PROPRIETARY
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Burger J biostratigraphy page 11
3.2 BIOSTRATIGRAPHIC SUBDIVISION: BURGER J (OCS-Y-2321)
Sea bed to 1512 ft: not examined
1512-3480 ft: Gardodinium trabeculosum Zone K7 (Albian) [1]
1512-1590 ft Subzone K7d (late Albian) [2]
Diagnostic palynomorphs:
1512 ft top Bacchidinium polypes (D) Zone 8 and older
top Vitreisporites pallidus (P) Zone 8 and older
top Apteodinium grande (D) Subzone K7d and older
top Chichaouadinium vestitum (D) Subzone K7e and older
top Chlamydophorella nyei (long horn) (D) Subzone K7d and older
top Endoscrinium turneri (D) Subzone K7e and older
top Leptodinium? hyalodermopsis (D) Subzone K7e and older
top Luxadinium primulum (D) Subzone K7e and older
top Luxadinium propatulum (D) Subzone K7e and older
top Oligosphaeridium totum totum Subzone K7d and older
top Ovoidinium scabrosum (D) Subzone K7e and older
top Protoellipsodinium spinocristatum (D) Subzone K7e and older
top Pseudoceratium turneri (D) Subzone K7e and older
top Senoniasphaera microreticulata (D) Subzone K7e and older
Lithology:
The washed residue from the only sample in this interval consists of fine grade, well sorted, sub-
angular, loose sand and a few lumps of crystalline pyrite.
Palynology:
Palynomorphs in the interval have fair to good preservation with some broken specimens.
Dinocysts comprise 15% of the palynological assemblage, with some probably representing the
PROPRIETARY
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Burger J biostratigraphy page 12
cysts of nearshore marine dinoflagellates that were washed into non-marine locations during
storm surges.
Micropaleontology:
No foraminifera were recovered from this sample; the only biogenic material consists of
abundant coal fragments and carbonised woody debris.
Paleoenvironment:
Nonmarine to marginal marine coastal swamp if in situ, but could be deeper, inner neritic if re-
deposited as a debris flow. The presence of dinocysts and miospores may indicate deposition in
salt water creeks within a marginal marine environment.
Stratigraphic comments:
Age and lithology are typical of the Nanushuk Group and probably represent a lowstand deposit,
or a debris flow sourced from the coastal swamps.
1590-1950 ft: Subzone K7c (middle Albian) [3]
Diagnostic palynomorphs:
1590 ft top Cauca parva (D) Subzone K7e and older
top Ellipsoidictyum imperfectum (D) Subzone K7e and older
top Gardodinium trabeculosum (D) Subzone K7e and older
1680 ft top Cyclonephelium brevispinum 'extremum' (very short spines) (D) Subzone K7e
and older
1770 ft top Systematophora cretacea (D) Subzone K7e and older
Lithology:
The washed residue is dominated by fine-grained, sub-angular, well-sorted, loose sand, which
occasionally occurs as well-cemented fragments, and is accompanied by minor amounts of hard,
dark-brown dolomite, and a buff to light-brown sandy mudstone. The sand is generally finer
grained than in the overlying interval.
PROPRIETARY
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Burger J biostratigraphy page 13
Palynology:
Palynomorphs in the interval have fair to good preservation with some broken specimens.
Dinocysts comprise 12-15% of the palynological assemblage, with some probably representing
the cysts of nearshore marine dinoflagellates that were washed into non-marine locations during
storm surges.
Micropaleontology:
No foraminifera were recovered from this interval. The only microfossils consist of small, brown
to dark-brown plant megaspores. Compared to the overlying interval there is a noticeable
decrease in the amount of coal and carbonized vegetation fragments.
Paleoenvironment:
Nonmarine to transitional; possibly strand line rather than swamp if the assemblages are in situ,
otherwise inner neritic, or deeper if redeposited as a debrite.
Stratigraphic comments:
Typical of the Nanushuk Group strata and possibly a regressive sequence.
1950-3210 ft: Subzone K7b (middle Albian) [3]
Diagnostic palynomorphs:
1950 ft top Microdinium setosum (D) Subzone K7b and older
top Tehamadinium tenuiceras (D) Subzone K7b and older
2130 ft top Stephodinium spinulosum (D) Subzone K7b and older marker
Diagnostic foraminifera:
2130 ft highest occurrence of foraminifera including Gaudryina tailleuri (F)
2220 ft top Ammodiscus rotalarius (F)
2310 ft top Haplophragmoides topagorukensis (F)
PROPRIETARY
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Burger J biostratigraphy page 14
Lithology:
The washed residues consist of a monotonous series of light-brown, variably sandy, and variably
carbonaceous mudstones with common amounts of fine-grained sand which is occasionally seen
as well-cemented fragments. Minor amounts of light-brown dolomite, as seen above, and light-
gray limestone occur infrequently. Light-gray to light-brownish gray mudstone appear below
2670 ft. Minor amounts of oilwell cement were seen at 3030 ft. Crystalline pyrite occurs in every
sample with peak of common amounts at 2490 ft and 2580 ft.
Palynology:
Palynomorphs in the interval have good preservation with some broken specimens. Dinocysts
comprise 9-17% of the palynological assemblage, except in the cuttings sample at 2310-2340 ft
where they only comprise 3% of the assemblage. Some of the dinocysts may represent the cysts
of nearshore marine dinoflagellates that were washed into non-marine locations during storm
surges.
Micropaleontology:
Low numbers of light-brown, thin-walled, agglutinated foraminifera occur in most samples below
2130 ft. The most commonly occurring species are Haplophragmoides chapmani and
Haplophragmoides topagorukensis, which are the only foraminifera below 2580 ft. Maximum
numbers and diversity occur at 2400 ft which also marks the deepest occurrence of G. tailleuri,
Saccammina spp. and the highest occurrence of frequent H. topagorukensis. A single specimen of
a very small, calcareous benthonic foraminifer, Gavelinella spp. occurs at 2490 ft. With the
exception of Saccammina, all the genera in this interval are considered to be mobile epi-lithic,
possibly epi-phytal, browsers.
Fragments of coal occur in almost every sample and fluctuate from rare to abundant, particularly
at 2670 ft where there are common amounts of carbonised vegetation.
Paleoenvironment:
The top of the interval was possibly deposited in nonmarine to transitional environments if the
assemblages are in situ, but shallow marine, inner shelf conditions are suggested by the relative
abundant and diverse foraminifera between 2130 ft and 2490 ft. Below 2580 ft, the restricted
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Haplophragmoides biofacies suggests nearshore, transitional environments with brackish
influence. Environmental conditions were probably strongly influenced by rapid short-term
variations in salinity and current velocity in shifting channels within a marsh to nearshore setting.
Ubiquitous pyrite suggests reducing conditions below the sediment-water interface.
Stratigraphic comments:
The interval probably represents an initial transgressive sequence reaching a local maximum
flooding event at about 2490 ft and thereafter a regressive sequence until the disappearance of
marine influences above 2130 ft which marks the onset of a lowstand sequence.
3210-3480 ft: Subzone K7a (early Albian) [3]
Diagnostic palynomorphs:
3210 ft top Impagidinium alectrolophum (D) Subzone K7a and older
top Kleithriasphaeridium simplicispinosum (D) Subzone K7a and older
top Occisucysta tentoria (D) Subzone K7a and older
3315 ft top Occisucysta echinata (D) Subzone K7a and older
Diagnostic foraminifera:
3315 ft deepest occurrence of rare Haplophragmoides chapmani (F)
Lithology:
The three samples in this interval are composed of variably brown-colored, sandy mudstone that
occasionally grades to clean, fine-grained sandstone. Rare fragments of cemented, well-sorted
sandstone and light-brown, firm limestone also occur. Pyrite is rare and fragments of oilwell
cement are rare to frequent at 3315 ft and 3390 ft.
Palynology:
Palynomorphs in the interval have good to good preservation with some broken specimens.
Dinocysts comprise 18-19% of the palynological assemblage, with some possibly representing
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the cysts of marine dinoflagellates that were washed into non-marine locations during storm
surges.
Micropaleontology:
Low numbers of small agglutinated foraminifera occur in all three samples. H. topagorukensis is
the most common, particularly at 3315 ft, plus rarer H. chapmani and single occurrences of
Saccammina and Ammodiscus rotalarius. Plant megaspores are absent, but carbonised, woody
vegetation is abundant at 3315 ft and 3390 ft.
Paleoenvironment:
Probably nearshore, shifting channels in a marsh, with marine, inner neritic influences.
Stratigraphic comments:
The local foraminiferal maximum at 3315 ft may represent the most marine influence within this
shallow water facies. It was not possible to recognise the subtle boundary between the more
marine Torok Formation and the overlying, less marine Nanushuk Group in this well. Either the
influx of carbonised vegetation at 3390 ft or the uphole consistent occurrence of megaspores
above 3030 ft in the overlying interval are possible candidates, and the boundary is picked at the
early-middle Albian horizon between palynomorph zones K7a and K7b.
3480-5280 ft: Oligosphaeridium asterigerum Zone K6 (Aptian) [2]
3480-3930 ft: Subzone K6b (late Aptian) [2]
Diagnostic palynomorphs:
3480 ft top Cerbia tabulata (D) Zone K6 and older marker
top Oligosphaeridium asterigerum (D) Zone K6 and older marker
3660 ft top Achomosphaera verdieri (D) Zone K6 and older marker
top Protoellipsodinium clavulum (D) Zone K6 and older marker
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Lithology:
This interval is composed of brown sandy mudstone which grades into muddy sandstone with
variable amounts of carbonaceous debris, as in the overlying intervals. The appearance of very
fine flakes of white mica is the only difference. Frequent to common amounts of pyrite are only
present in the top two samples at 3480 ft and 3570 ft.
Palynology:
Palynomorphs in the interval have good to excellent preservation, with dinocysts comprising 18-
24% of the palynological assemblage. Miospores comprise both water and wind-borne pollen and
spores that were transported to the depositional site.
Micropaleontology:
Rare and single specimens of H. topagorukensis occur in decreasing numbers downhole.
Carbonised vegetation is frequent to common in the top three samples, but very rare in the
deepest two samples at 3750 ft and 3840 ft. The deepest sample, at 3840 ft, is almost barren and
only one indeterminate agglutinated foraminifer plus a few megaspores were recovered.
Fragments of coal are frequent to common in all samples.
Paleoenvironment:
The upper part of the interval may have been deposited in an inner neritic environment; the lower
part was probably deposited in a nearshore, transitional environment.
Stratigraphic comments:
The uphole biofacies development suggests a transgressive sequence that culminates with the
local microfaunal maximum at 3315 ft in the overlying interval. The base of the interval is
probably coincident with a sequence boundary which overlies a deeper marine biofacies of the
underlying interval.
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3930-5280 ft: Subzone K6a (late part of the Early Aptian) [4]
Diagnostic palynomorphs:
3930 ft top Oligosphaeridium asterigerum abundance (D) Subzone K6a and older marker
Diagnostic foraminifera:
3930 ft top Bathysiphon brosgei and Hippocrepina barksdalei (F)
4290 ft top rare occurrences of Conorboides umiatensis (F)
4980 ft top Parvicingula spp. (R)
top common to abundant loose, quartz pebbles (M)
top pyrite 'sticks' (M)
5010 ft top Verneuilinoides borealis (F) and top 'round browns' (M)
5220 ft base consistent occurrences of Pseudodictyomitra spp. (R),
isolated occurrence of Hedbergella aptiana (F)
5250 ft re-appearance of Gaudryina tailleuri (F),
base Haplophragmoides topagorukensis (F)
Lithology:
This interval can be divided into two sections based on the lithology and biofacies.
The upper section down to 4200 ft is much sandier than the overlying interval and the washed
residues are dominated by fragments of moderately well-cemented, fine-grained, subangular,
quartzose sand. Below 4290 ft, a medium to dark gray, micromicaceous mudstone occurs in
addition to the medium brownish gray, sandy mudstone. Pyrite is frequent to abundant down to
4380 ft, but is almost absent from 4470 ft to 4920 ft. In the same section, the mudstones are
richly carbonaceous and abundant coal fragments occur from 4560 ft to 4740 ft.
The lower section from 4980 ft downwards consists of brown, silty, carbonaceous, mudstone
accompanied by poorly sorted and occasionally well-cemented, sandstone. The grain size ranges
from very fine to coarse with scattered very coarse, well-rounded, subspherical quartz grains. In
the washed residue there are common to abundant well-polished quartz grains larger than 500
microns. At the same depth, pyrite reappears in abundance and remains abundant throughout the
remainder of the section. Crystalline lumps, plus small, finely crystalline spheres and discoids
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occur with frequent cylindrical pyrite 'sticks'. This lower section is also characterized by the
occurrence of a minor component of hard, light-gray to dark grayish brown, non-calcareous
fragments which are possibly tuffaceous. Some of the larger mudstone fragments below 5190 ft
seem to be veined with a white, non-calcareous mineral.
Palynology:
Palynomorphs in the interval have good to excellent preservation, with dinocysts mostly
comprising more than 20% of the palynological assemblage, and reaching a peak of 32% between
4020-4140 ft, and a minimum of 16% in the cuttings samples at 44709-4500 ft and 5100-5130 ft.
Miospores comprise both water and wind-borne pollen and spores that were transported to the
marine depositional site.
Micropaleontology:
The upper section from 3930 ft to 4920 ft is sparsely fossiliferous and the agglutinated
foraminifera are mainly H. topagorukensis, B. brosgei and H. barksdalei.
The following additional events also occur:
4020 ft isolated occurrence of Pseudodictyomitra spp. (R) and shelly debris (M)
4560 ft local base B. brosgei
4650 ft local base H. topagorukensis
The samples from 4740 ft to 4920 ft, which contain common to abundant coal fragments and
carbonaceous debris, are devoid of foraminifera and only yielded a single megaspore.
The section below 4980 ft is marked by the reappearance of H. topagorukensis and B. brosgei,
but very few agglutinated foraminifera occur between 5040 ft and 5190 ft. The section is further
characterized by the occurrence of the pyritized nassellarian radiolaria Parvicingula,
Pseudodictyomitra, Archaeodictyomitra and Xitus. These genera were probably assigned to
Lithocampe in older Chukchi well reports. It is possible that the small, finely crystalline spheres
and discoids are pseudomorphs after radiolaria, but the lack of any surface ornament precludes a
confident assignment. The other characteristic microfossil which occurs throughout this section is
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the small, smooth sphere, which may be the algal cyst reported as 'round browns' in modern
oceanographic reports.
The most interesting event in this section is the recovery of a few pyritized planktonic
foraminifera at 5220 ft which are assigned to Hedbergella aptiana. This species characterized the
early Aptian in northern Europe and southern Russia. As far as can be ascertained, there are no
previous reports of planktonic foraminifera from the Early Cretaceous of the Arctic region.
A few specimens of H. topagorukensis and a few calcareous benthonic foraminifera reappear in
the samples from 5190 ft to 5280 ft.
Paleoenvironment:
Within the section 3830 ft to 4650 ft, the presence of Bathysiphon and Hippocrepina reflect
marine, outer neritic water depths, with suboxic conditions below the sea bed being indicated by
the presence of abundant pyrite. The reappearance of abundant coal fragments in the lower half
of the section, below 4560 ft, may reflect a return to nearshore conditions, but the event probably
represents a substantial debrite flow sourced from the coastline.
Within the section from 4980 ft to 5280 ft deeper, outer neritic to upper bathyal water depths are
indicated by the agglutinated foraminifera and the presence of bathypelagic, nassellarian
radiolaria. Fluctuations in lithology and biofacies are consistent with debris flows and frequent
scouring of the substrate.
Stratigraphic comments:
The marked discontinuity between 4950 ft and 4980 ft may reflect a sequence boundary within
the Torok Formation or a tectonic slide plane.
There is no palynological evidence for the early Aptian Muderongia asymmetrica Zone K5,
indicating that the lower boundary of this interval represents a significant unconformity at the
base of the Brookian sequence.
The presence of abundant, coarse, well-rounded quartz grains could suggest the 'Pebble Shale' but
large, cemented, rock fragments indicate that they are associated with influxes of poorly sorted
sand.
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5280-5790 ft: Aptea anaphrissa Zone K4 (late Hauterivian to Barremian) [2]
Diagnostic palynomorphs:
5280 ft top Aptea anaphrissa (D) Zone K4 and older marker
top Muderongia asymmetrica (D) Zone K4 and older marker
top Muderongia tetracantha (D) Zone K5 and older marker
top Subtilisphaera perlucida (D) Zone K5 and older marker
5310 ft top Kleithriasphaeridium fasciatum (D) Zone K4 and older marker
Diagnostic foraminifera:
5280 ft top Haplophragmoides concavus (F),
top Recurvoides ex gr. stschekuriensis sensu Fowler & Braun 1993 (F),
top Recurvoides ex gr. canningensis (F)
5310 ft top Lagena hauteriviana hauteriviana (F)
5426 ft top Labrospira goodenoughensis (F)
5610 ft top Lenticulina saxocretacea (F)
Lithology:
The interval is characterized by the occurrence of dark-gray to almost black, laminated, non-
calcareous and occasionally micromicaceous, mudstone. Larger fragments contain isolated,
coarse, well-rounded quartz grains that sometimes do not have high sphericity. Mudstone and
sandy conglomeratic lithofacies occur locally. The shallowest five samples also contain
fragments of highly calcareous, reddish brown mudstone that is shot through with white
anastomosing veins. Lighter gray, carbonaceous and micromicaceous sandy mudstones, which
grade to poorly sorted argillaceous sandstones, are present in variable proportions in all samples.
Pyrite is ubiquitous and occurs as crystalline lumps, small spheres, small discoids and 'sticks'.
Framboidal pyrite lumps are mostly rare, but a slight increase was noted in the deepest three
samples. Dark-green, oviform pellets/peloids are common in the deepest sample at 5780 ft.
Palynology:
Palynomorphs in the interval have good to excellent preservation, with dinocysts comprising 52-
72% of the palynological assemblage, except in the cuttings sample at 5280-5310 ft where they
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comprise 43% of the assemblage. Miospores comprise both water and wind-borne pollen and
spores that were transported to the marine depositional site. Common specimens of
palynomorphs that characterize palynomorph Zone K2 (Valanginian) are interpreted to be
reworked in this interval.
Micropaleontology:
The rich and diverse foraminiferal assemblages are dominated by dark-brown, fine-grained
agglutinated foraminifera, particularly species of Recurvoides, with diverse but individually
sparse, calcareous benthonic foraminifera. A few nassellarian radiolaria also occur, plus two
occurrences of possible planktonic foraminifera, a single specimen of Hedbergella aptiana at
5310 ft, and a specimen tentatively assigned to Hedbergella tushepsensis at 5580 ft. Megaspores
and 'round browns' occur throughout.
Allowing for taxonomic revisions, the entire assemblage is comparable with those in adjacent
wells and published studies in Alaska and Arctic Canada (Wall, 1983; Fowler & Braun, 1993;
Mickey et al.,2006). The highest occurrence of Lagena hauteriviana hauteriviana may indicate
an age no younger than Middle Barremian. There is no available publication of a well-calibrated
microfauna that would allow recognition of Hauterivian strata in this well.
The most common, age-diagnostic and correlative agglutinated foraminiferal species are listed
above. Other frequently occurring taxa include Gaudryina tailleuri, Haplophragmoides
lobatoloculare, and undifferentiated specimens of Recurvoides. Very few of the species are
considered to be adapted to filter feeding, and most are mobile, epilithic morphotypes. Many of
the specimens of agglutinated foraminifera are either nearly opaque, deformed or broken, which
often precludes their confident identification, and such specimens are recorded as 'indet
frag/crushed agglut forams' on the range charts.
Approximately 20 species of calcareous benthonic foraminifera were recognised, although many
occur in only a few samples. The scattered occurrences of taxa that occur regularly in the
underlying Valanginian mudstones suggests that many of the calcareous benthonic foraminifera
are reworked in this interval. A distinct, and possibly in situ, sub-assemblage occurs below 5610
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ft which comprises Lenticulina saxocretacea, Lenticulina macrodisca, Lenticulina muensteri and
Conorboides walli.
Paleoenvironment:
Marine, bathyal water depths with near normal conditions of salinity and dysoxic to oxic
conditions at the sea bed. Some of the fragments of dark gray mudstone have the appearance of a
diamicton. The sandy beds are probably basin-floor, turbidite fan deposits. The pellets/peloids
recovered from the deepest sample may indicate a starved horizon.
Stratigraphic comments:
The underlying interval at 5790 ft is dated as Valanginian, indicating the presence of a significant
stratigraphic break at the base of this interval which marks the base of the 'Brookian Sequence',
also known as the Lower Cretaceous Unconformity. The interval is a highstand deposit with little
sequential change to indicate variation in depositional regime.
5790-6570 ft: Gochteodinia judilentinae Zone K2 (Valanginian) [2]
Diagnostic palynomorphs:
5790 ft top Batioladinium micropodum (D) Zone K2 and older marker
top Gochteodinia villosa (D) Zone K3 and older marker
top Muderongia cf. M. simplex sensu Brideaux & McIntyre 1980 (D) Zone K2 and
older marker
top Nelchinopsis kostromiensis (D) Zone K2 and older marker
top Oligosphaeridium sp. GE of Brideaux & McIntyre 1980 (D) Zone K2 and
older marker
top Oligosphaeridium vasiforme (D) Zone K2 and older marker
top Paragonyaulacysta borealis (D) Zone K2 and older marker
top Stiphrosphaeridium dictyophorum (D) Zone K2 and older marker
top Tubotuberella uncinata (D) Zone K2 and older marker
5820 ft top Cymososphaeridium validum (D) Zone K2 and older marker
top Egmontodinium expiratum (D) Zone K2 and older marker
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5850 ft top Gochteodinia judilentinae (D) Zone K2 and older marker
5880 ft top Oligosphaeridium diluculum (D) Zone K2 and older marker
5910 ft top Apteodinium spongiosum (D) Zone K2 and older marker
5990 ft top Parvocavatus spinosum (D) Zone K2 and older marker
Diagnostic foraminifera:
5850 ft top Cribrostomoides infracretaceous (F)
6050 ft top Saracenaria valanginiana (F),
top common Labrospira goodenoughensis (F)
6080 ft top Epistomina caracolla anterior (F)
6110 ft top Uvigerinammina sp.1 of Wall 1983 (F),
top common to abundant Cribrostomoides infracretaceous (F)
Lithology:
This interval can be subdivided into four sections: an upper mudstone; an upper sandstone; a
middle mudstone; and a lower sandstone.
The upper mudstone occurs in the top two samples and consists of grey to brown, occasionally
micromicaceous, variably sandy, mudstone together with dark gray, mudstone with coarse sand
grains.
The upper sandstone which is picked in the cuttings samples from 5850 ft to 6050 ft is gray to
white, quartzose, medium to fine-grained, occasionally with coarse 'floating' grains, well-sorted,
hard, occasionally loose, and with a white argillaceous matrix. Crystalline pyrite is common to
abundant throughout and pyrite 'sticks' are relatively rare. This section is attributed to the 'Burger
Sandstone' (Craig & Sherwood, 2004; Sherwood, 2012).
The underlying section, from 6050 ft to 6410 ft, is composed of light-grayish brown to brown,
silty, occasionally pyritic mudstone, grading to fine-grained, argillaceous sandstone which is
composed of varicoloured grains. The mudstone becomes noticeably less sandy below 6290 ft.
Pyrite 'sticks' and crystalline pyrite become abundant below 6290 ft and are accompanied by
small pyrite spheres.
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The lower sandstone is picked from 6410 ft to the base of the interval at 6560 ft. Compared to the
upper sandstone it is much more argillaceous and micromicaceous. Fragments of a relatively
clean sandstone occur at 6440 ft and 6470 ft.
Palynology:
Palynomorphs in the interval have good to excellent preservation. Dinocysts comprise 52-77% of
the palynological assemblage in the upper part of the interval from 5790-6500 ft, decreasing in
the lower part to 47-49% from 6500-6570 ft. Miospores comprise both water and wind-borne
pollen and spores that were transported to the marine depositional site. Reworked Late Jurassic
palynomorphs occur sporadically in this interval and mostly represent Kimmeridgian to early
Volgian Zones J7 and J8.
Micropaleontology:
The upper mudstone contains indeterminate fragments of agglutinated foraminifera, a few
Lenticulina muensteri and a specimen of Geinitzinita arctocretacea.
Recovery from the 'Burger Sandstone' was sparse but diverse. The agglutinated foraminifera are
composed of white specimens of Glomospira subarctica, Glomospira variabilis and
Glomospirella arctica. White, coarse-grained and occasionally large Haplophragmoides occur
below 5910 ft. The most characteristic feature is the occurrence of calcareous tubes which are
attributed to Ditrupa.
The microfauna from the middle mudstone is dominated by a rich and diverse assemblage of
agglutinated foraminifera with a diverse and consistently occurring assemblage of calcareous
benthonic foraminifera. Inoceramus debris and shelly fragments occur in every sample below
6140 ft. In addition to the listed diagnostic taxa, Bathysiphon vitta, Glomospira subarctica,
Recurvoides ex gr. canningensis and undifferentiated Recurvoides occur in all samples, together
with regular occurrences of the calcareous benthonic foraminifera Saracenaria pyramidata,
Lenticulina muensteri, Astacolus strombecki and undifferentiated fragments of Dentalina/
Nodosaria. Most of the scattered occurrences of these taxa in the overlying late Hauterivian to
Barremian, 'Pebble Shale Unit' probably represent reworking. In the highly pyritic mudstones
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below 6290 ft, the microfauna is dominated by C. infracretaceous and a suite of small finely
agglutinated species of Trochammina, Gaudryina and Haplophragmoides cushmani.
In the lower sandstone section, calcareous benthonic foraminifera are sparse and the agglutinated
foraminifera are reduced in numbers and diversity. Coarse-grained Haplophragmoides, similar to
those seen in the lower part of the 'Burger Sandstone', reappear between 6500 ft and 6500 ft.
Ditrupa tubes are absent.
Paleoenvironment:
The limited microfauna and the worm tubes in the 'Burger Sandstone' are consistent with
relatively shallow marine conditions and inner to middle neritic water depths. For the underlying
thick mudstone, a deep, outer neritic to upper bathyal environment with relatively tranquil
conditions is suggested by the rich and diverse microfaunas, but with strongly dysoxic conditions
within the substrate, particularly for the section below 6290 ft. Deposition of the lower sandstone
probably took place in a similar deep-water environment.
Stratigraphic comments:
The lower sandstone is probably a lowstand fan deposit overlain by a transgressive sequence of
deep marine mudstones which are separated from the overlying 'Burger Sandstone' by a sequence
boundary marking the start of a regressive sequence. This sequence is terminated upwards by a
return to transgressive conditions marked by the mudstone cap. The presence of pellets/peloids at
the upper boundary of the interval suggests prolonged sediment starvation.
6570-6800 ft (TD): Horologinella spinosigibberosa Zone K1 (Berriasian) [3]
Diagnostic palynomorphs:
6570 ft top Paragonyaulacysta capillosa (D) Zone K1 and older marker
top Priodinium alaskense (D) Zone K1 and older marker
6630 ft top Atopodinium prostatum (D) Zone K1 and older marker
top Horologinella spinosigibberosa (D) Zone K1 and older marker
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Diagnostic foraminifera:
6570 ft top Cribrostomoides canui (F)
6630 ft top Pseudolamarckina spp. (F)
6660 ft top regular occurrences Schuleridea spp. (O)
6690 ft top Ammobaculites alaskensis (F)
Lithology:
The upper part of the interval is very sandy. In the underlying samples, the mudstones are
dominated by dark gray colors in contrast to the brownish gray colors of the overlying interval.
Pyrite is common and the small 'sticks' occur in floods below 6630 ft.
Palynology:
Palynomorphs in the interval have good to excellent preservation, with dinocysts comprising 46-
53% of the assemblage. Miospores comprise both water and wind-borne pollen and spores that
were transported to the marine depositional site.
Micropaleontology:
The microfaunal change at the top of this interval is marked by the appearance and sustained
occurrence of frequent to common C. canui and the almost complete disappearance of
C. infracretaceous. Only agglutinated foraminifera and Ditrupa tubes occur in the sand-rich
samples at 6570 ft to 6600 ft. From 6300 ft to the base of the well at 6800 ft, the agglutinated
foraminifera are composed of diverse and moderately abundant assemblages dominated by
C. canui, L. goodenoughensis, B. vitta and species of Saccammina and Recurvoides. The only
consistently present calcareous benthonics are L. muensteri, Pseudolamarckina and small
polymorphinids. Other notable events in this interval are the regular occurrences of ostracoda
below 6660 ft and the occurrence of frequent numbers of species of Ammobaculites and small
Gaudryina below 6690 ft.
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Paleoenvironment:
Marine, outer neritic to shallow upper bathyal water depths with strongly dysoxic conditions
within the substrate. Some of the ostracoda have eye tubercles which may indicate that deposition
was within the photic zone.
Stratigraphic comments:
If the Ditrupa tubes recovered at the top of the interval are in situ, the interval would appear to be
a regressive sequence. There may be a sequence boundary at the top of this interval, below the
lowstand fan sandstone, at the base of the overlying Valanginian interval.
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4. LITHOSTRATIGRAPHIC PICKS: BURGER J (OCS-Y-2321)
The following lithostratigraphic picks are based on ages assigned to the well section in the
present study. Depths are based on the observations of cutting samples and are approximate
because well logs were not provided for the study
1512 FT: LOWER BROOKIAN SEQUENCE (top not seen)
1512 ft: Nanushuk Group
3210 ft: Torok Formation
5280 FT: RIFT SEQUENCE
5280 ft: Pebble Shale Unit
5790 ft: Kuparuk equivalent
6800 ft: Total Depth
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5. SAMPLES ANALYSED, BURGER J (OCS-Y-2321)
No. Sample Paleo No Sample Paleo No Sample Paleo interval interval interval 1 1,512-1,530 M P 2 1,590-1,620 M P 3 1,680-1,710 M P 4 1,770-1,800 M P 5 1,860-1,890 M P 6 1,950-1,980 M P 7 2,040-2,070 M P 8 2,130-2,160 M P 9 2,220-2,250 M P 10 2,310-2,340 M P 11 2,400-2,430 M P 12 2,490-2,520 M P 13 2,580-2,610 M P 14 2,670-2,700 M P 15 2,760-2,790 M P 16 2,850-2,880 M P 17 2,940-2,963 M P 18 3,030-3,060 M P 19 3,120-3,150 M P 20 3,210-3,240 M P 21 3,315-3,330 M P 22 3,390-3,420 M P 23 3,480-3,510 M P 24 3,570-3,600 M P 25 3,660-3,690 M P 26 3,750-3,780 M P 27 3,840-3,870 M P 28 3,930-3,960 M P 29 4,020-4,050 M P 30 4,110-4,140 M P 31 4,200-4,230 M P 32 4,290-4,320 M P 33 4,380-4,410 M P 34 4,470-4,500 M P
35 4,560-4,590 M P 36 4,650-4,680 M P 37 4,740-4,770 M P 38 4,830-4,860 M P 39 4,920-4,950 M P 40 4,980-5,010 M P 41 5,010-5,040 M P 42 5,040-5,070 M P 43 5,070-5,100 M P 44 5,100-5,130 M P 45 5,130-5,160 M P 46 5,160-5,190 M P 47 5,190-5,220 M P 48 5,220-5,250 M P 49 5,250-5,280 M P 50 5,280-5,310 M P 51 5,310-5,340 M P 52 5,340-5,370 M P 53 5,370-5,400 M P 54 5,400-5,423 M P 55 5,426-5,460 M P 56 5,460-5,490 M P 57 5,490-5,520 M P 58 5,520-5,550 M P 59 5,550-5,580 M P 60 5,580-5,610 M P 61 5,610-5,640 M P 62 5,640-5,670 M P 63 5,670-5,700 M P 64 5,700-5,730 M P 65 5,750-5,760 M P 66 5,780-5,790 M P 67 5,790-5,820 M P 68 5,820-5,850 M P
69 5,850-5,880 M P 70 5,880-5,910 M P 71 5,910-5,940 M P 72 5,960-5,970 M P 73 5,990-6,000 M P 74 6,020-6,050 M P 75 6,050-6,080 M P 76 6,080-6,110 M P 77 6,110-6,140 M P 78 6,140-6,170 M P 79 6,170-6,200 M P 80 6,200-6,230 M P 81 6,230-6,260 M P 82 6,260-6,290 M P 83 6,290-6,320 M P 84 6,320-6,350 M P 85 6,350-6,380 M P 86 6,380-6,410 M P 87 6,410-6,440 M P 88 6,440-6,460 M P 89 6,470-6,480 M P 90 6,500-6,510 M P 91 6,530-6,540 M P 92 6,560-6,570 M P 93 6,570-6,600 M P 94 6,600-6,630 M P 95 6,630-6,660 M P 96 6,660-6,690 M P 97 6,690-6,720 M P 98 6,720-6,750 M P 99 6,750-6,780 M P 100 6,780-6,800 M P
Paleo analysis M Micropaleontology P Palynology
PROPRIETARY
Page 34
Burger J biostratigraphy page 31
6. REFERENCES AND SELECTED SOURCES
BANET, S. M. & SCHERR, J. 1992. Correlation of selected exploration wells from the North
Slope and Beaufort Sea, Alaska. MMS OCS Report vol. 91-0076, pp. 101-106.
BARTENSTEIN, H.,1976. Practical applicability of a zonation with benthonic Foraminifera in
the worldwide Lower Cretaceous. Geologie en Mijnbouw, v. 55, p. 83-86.
BARTENSTEIN, H., 1979. Worldwide zonation of the Lower Cretaceous using benthonic
foraminifera. Newsletters on Stratigraphy, v. 7, p. 142-154.
BARTENSTEIN, H. and BRAND, E., 1951. Mikropalaontologische Untersuchungen zur
Stratigraphie des nordwestdeutschen Valendis. Senckenbergische Naturforschende
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BERGGREN, W.A., KENT, D. V., SWISHER, C.C. & AUBRY, M.P. 1995. A revised Cenozoic
geochronology and chronostratigraphy. In: Berggren, W.A. et al (eds), Geochronology,
time scales and global stratigraphic correlations: a unified temporal framework for an
historical geology. Society of Economic Paleontologists and Mineralogists Special
Publication No. 54, pp. 129-212.
BERQUIST, H., 1966. Micropaleontology of the Mesozoic rocks of Northern Alaska. U. S.
Geological Survey, Professional paper No 302-D, 227 p.
BIRD, K. J. & MOLANAAR, C. M. 1987. Stratigraphy. In: Bird, K. J. and Magoon, L. B. (eds),
Petroleum geology of the northern part of the Arctic National Wildlife Refuge,
northeastern Alaska. United States Geological Survey Bulletin 1778, pp. 37-59.
BUJAK RESEARCH AND SCOTT RESEARCH 1984. Beaufort – Mackenzie Paleontological
Atlas: Volume 1 Palynology. Non-exclusive report, September 1984.
BUJAK RESEARCH INTERNATIONAL 2003a. Mesozoic biostratigraphic zonation, Alaska
North Slope and Canadian Beaufort – Mackenzie area. Non-exclusive report, August
2003.
PROPRIETARY
Page 35
Burger J biostratigraphy page 32
BUJAK RESEARCH INTERNATIONAL 2003b. Cenozoic biostratigraphic zonation, Alaska
North Slope and Canadian Beaufort – Mackenzie area. Non-exclusive report, August
2003.
BULYNNIKOVA, S. P., KOMISSARENKO, V. K., BELOUSOVA, N. H., BOGOMJAKOVA,
E. D., RYLKOVA, G. E. and TYLKINA, K. E., 1990. Atlas of Mollusca and
Foraminifera of Upper Jurassic and Neocomian Marine Deposits of the Western Siberian
Oil-bearing Area, vol. 2. Foraminifera. Sibirskiy Nauchno-issledovatel'skiy Institut
Geologii, Geofizikii i Mineral'nogo Syrja, (SNIIGGIMS), 359 p. [original in Russian.]
CHAMNEY, T. P., 1969. Barremian Textulariina, Foraminiferida from Lower Cretaceous beds,
Mount Goodenough section, Aklavik Range, District of Mackenzie. Geological Survey of
Canada, Bulletin 185, 41 p.
CHAMNEY, T. P., 1971. New species of Foraminifera, Cretaceous-Jurassic boundary, Arctic
America. Geological Survey of Canada, Bulletin 192, p. 95-109.
CHAMNEY, T. P., 1978: Albian Foraminifera of the Yukon Territory. Geological Survey of
Canada, Bulletin 253, 62 p.
CRAIG, J. D. and SHERWOOD, K. W., 2001. Economic Study of the Burger Gas Discovery,
Chukchi Shelf, Northwest Alaska (revised 2004). U. S. Department of the Interior,
Minerals Management Service. Anchorage, Alaska. Available online at
http://www.mms.gov/alaska/re/reports/rereport.htm.
DAIN, L. G. (ed.), 1972. Foraminifera of the Upper Jurassic deposits of Siberia. All-Union
Petroleum Scientific-Research, Geological-Prospecting Institute, (VNIGRI), Trudy, no.
317. [original in Russian].
DAVIES, E.H.. 1983. The dinoflagellate Opell-Zonation of the Jurassic – Lower Cretaceous
sequence in the Sverdrup Basin, Arctic Canada. Geological Survey of Canada Bulletin
359.
DAVIES, E.H.. 1985. Dinoflagellate cyst occurrences of the Jurassic – Lower Cretaceous
sequence in the Sverdrup Basin, Arctic Canada. Geological Survey of Canada Open
File Report 1153.
PROPRIETARY
Page 36
Burger J biostratigraphy page 33
DIXON, J. 1982. Jurassic and Lower Cretaceous subsurface stratigraphy of the Mackenzie Delta
–Tuktoyaktuk Peninsula, N.W.T. Geological Survey of Canada Bulletin 349. 52 p.
DIXON.J,.(ed.), 1996. Geological Atlas of the Beaufort-Mackenzie Area. Geological Survey of
Canada, Miscellaneous Report 59.
DUXBURY, S. 2001. A palynological zonation scheme for the Lower Cretaceous - United
Kingdom Sector, Central North Sea. - N. Jb. geol. Palaont. Abh., vol. 219, pp. 95-137;
Stuttgart
FOWLER, S. P., 1985. Lower Cretaceous foraminiferal microfaunas and biostratigraphy of the
Richardson Mountains, Yukon and Northwest Territories. Unpublished PhD thesis,
University of Saskatchewan, Saskatoon, 394 p.
FOWLER, S. P., 1996. Distribution of selected Berriasian to Aptian benthic foraminifers in the
Beaufort-Mackenzie Area, p. 102, fig. 68. in DIXON.J,.(ed.), 1996. Geological Atlas of
the Beaufort-Mackenzie Area. Geological Survey of Canada, Miscellaneous Report 59.
FOWLER, S. P. and BRAUN, W., 1993: Hauterivian to Barremian foraminifera and
biostratigraphy of the Mount Goodenough Formation, Aklavik Range, northwestern
District of Mackenzie. Geological Survey of Canada, Bulletin 443, 88 p., 9 pl.
GRADSTEIN, F.M., AGTERBERG, F.P., OGG, J.G., HARDENBOL, J., VAN VEEN, P.,
THIERRY, J. & HUANG, Z. 1995. A Triassic, Jurassic and Cretaceous time scale. In:
Berggren, W.A. et al (eds), Geochronology, time scales and global stratigraphic
correlations: a unified temporal framework for an historical geology. Society of
Economic Paleontologists and Mineralogists Special Publication No. 54, pp. 95-236.
HEDINGER, A.S., 1979: Late Jurassic Foraminifera from the Aklavik Range, Northwest
Territories. MSc. thesis, University of Alberta, Edmonton, Alberta.
HEDINGER, A. S., 1994. Upper Jurassic (Oxfordian-Volgian) Foraminifera from the Husky
Formation, Aklavik Range, District of Mackenzie, Northwest Territories. Geological
Survey of Canada, Bulletin 439, 173 p., 28 pl.
PROPRIETARY
Page 37
Burger J biostratigraphy page 34
HEDINGER, A. S., 1996. Distribution of Jurassic Foraminifers in the Beaufort-Mackenzie Area,
p. 100, fig. 67. in DIXON.J,.(ed.), 1996. Geological Atlas of the Beaufort-Mackenzie
Area. Geological Survey of Canada, Miscellaneous Report 59.
KELLER, M. A., and MACQUAKER, J. H .S., 2015. Arctic Alaska’s Lower Cretaceous
(Hauterivian and Barremian) mudstone succession - Linking lithofacies, texture, and
geochemistry to marine processes, in DUMOULIN, J. A., (ed.), Studies by the U.S.
Geological Survey in Alaska, vol. 15: United States Geological Survey Professional
Paper 1814–B, 35 p., http://dx.doi.org/10.3133/pp1814B.
MCNEIL, D. H., 1996. Distribution of Albian to Maastrichtian benthic foraminifers in the
Beaufort-Mackenzie Area, p. 104, fig. 69. in DIXON.J,.(ed.), 1996. Geological Atlas of
the Beaufort-Mackenzie Area. Geological Survey of Canada, Miscellaneous Report 59.
MEYN, H and VESPERMANN, J. 1994. Taxonomische Revision von Foraminiferen der
Unterkreide SE-Niedersachens nach Roemer (1839,1841, 1842), Koch (1851) und Reuss
(1863). Senkenbergiana Lethaea, v. 74, p. 49-272.
MICKEY, M. B. and HAGA, H., 1987. Jurassic-Neocomian Biostratigraphy, North Slope,
Alaska. in TAILLEUR, I. and WEIMER P. (eds.), Alaskan North Slope Geology. Pacific
Section SEPM, Book 50, v. ,1 p. 397-404.
MICKEY, M. B., HAGA, H. and BIRD, K. J., 2006. Micropaleontology of Selected Wells and
Seismic Shot Holes, Northern Alaska. United States Geological Survey, Open-File Report
2006-1055.
MOLENAAR, C. M. 1983. Depositional relations of Cretaceous and Lower Tertiary rocks,
northeastern Alaska. The American Association of Petroleum Geologists Bulletin, vol.
67, pp. 1066-1080.
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T. 1994. Geology of northern Alaska. In: Plafker, G. & Bergn H. C., eds., The Geology
of Alaska: Boulder, Colorado, Geological Society of America, The Geology of North
America, vol. G-1.
PROPRIETARY
Page 38
Burger J biostratigraphy page 35
SHELL GULF OF MEXICO INC., 2015. Revised Outer Continental Shelf Lease Exploration
Plan Chukchi Sea, Alaska. Burger prospect: Posey Area Blocks 6714, 6762, 6764, 6812,
6912 and 6915. Chukchi Sea Lease Sale 193. (Public Information Version).
SHERWOOD, K. W., 2012. Regional correlations for wells on U.S. Chukchi Shelf and Western
Arctic Alaska, version 06. Bureau of Ocean Energy Management, Alaska OCS Region.
SLITER, W. V., 1981. Albian Foraminifers from the Lower Cretaceous Christopher Formation of
the Canadian Arctic Islands. Geological Survey of Canada, Bulletin, 300, p 41-70, pl. 9-
15.
SOUAYA, F. J., 1976. Foraminifera of Sun-Gulf-Global Linckens Island Well P-46, Arctic
Archipelago, Canada. Micropaleontology, vol. 22, pp. 249-306.
TAPPAN, H., 1955. Foraminifera from the Arctic Slope of Alaska. Part 2, Jurassic Foraminifera.
United States Geological Survey, Professional Paper 236-B.
TAPPAN, H., 1957. New Cretaceous index Foraminifera from northern Alaska; in Studies in
Foraminifera, A.R. Loeblich, Jr. (ed.); United States National Museum, Bulletin 215, p.
201-222.
TAPPAN, H., 1960. Cretaceous biostratigraphy of northern Alaska. Bulletin of the American
Association of Petroleum Geologists, v. 44, no. 3, p. 273 - 297.
TAPPAN, H., 1962. Foraminifera from the Arctic Slope of Alaska. Part 3, Cretaceous
Foraminifera. United States Geological Survey, Professional Paper 236-C, p. 1-209, pl..
29-58.
WALL, J. H., 1983. Jurassic and Cretaceous foraminiferal biostratigraphy in the Eastern
Sverdrup Basin, Canadian Arctic archipelago. Bulletin of Canadian Petroleum Geology,
v. 31, p. 246-281.
PROPRIETARY
Page 39
Burger J biostratigraphy page 36
APPENDIX A: RANGE CHARTS
Micropaleontological range chart in StrataBugs format
Plot showing lithostratigraphy, age, palynological zonal intervals and micropaleontological
assemblages; taxa arranged by highest occurrence (tops) within major groups
Palynological range chart in StrataBugs format
Plot showing lithostratigraphy, age, palynological zonal intervals and micropaleontological
assemblages; taxa arranged by highest occurrence (tops) within major groups
Palynological and micropaleontological range charts were also supplied digitally in excel format.
PROPRIETARY
Page 40
Depth
1750'
2000'
2250'
2500'
2750'
3000'
3250'
3500'
3750'
4000'
4250'
4500'
4750'
5000'
5250'
5500'
5750'
6000'
6250'
6500'
6750'TD
Depth
500m
550m
600m
650m
700m
750m
800m
850m
900m
950m
1000m
1050m
1100m
1150m
1200m
1250m
1300m
1350m
1400m
1450m
1500m
1550m
1600m
1650m
1700m
1750m
1800m
1850m
1900m
1950m
2000m
2050mTD
Well Name : BURGER J (OCS-Y-2321)Interval Various Micropaleontological chart
Scale : 1:5000 prepared by Paul Connell for Bujak Research International
Chart date: 16 February 2016 Chukchi Sea
Jonathan Bujak
UK
Ch
ron
ostr
ati
gra
ph
y
late Albian1590
middle Albian
3210
early Albian
3480
late Aptian
3930
late part of theEarly Aptian
5280
Barremian -Hauterivian
5790
Valanginian
6570
6800.0
Berriasian
Ag
e
Lit
ho
str
ati
gra
ph
y
1512
Nanushuk Fm
3210
Torok Fm
5280
Pebble Shale
5790
6800.0
Kuparukequivalent
Fo
rmati
on
Palynological Zone
1512
K7
3480
K6
5280
K4
5790
K2
6570
6800.0
K1
Zo
ne
K7d1590
K7c
1950
K7b
3210
K7a
3480
K6b
3930
5280
K6a
Su
b Z
on
e
Mic
rop
ale
on
tolo
gic
al
assem
bla
ges
no assemblage recognisable
1590
megaspores
2130
Haplophragmoidestopagorukensis /
Gaudryina tailleuri
3930
Bathysiphon brosgei
4980
radiolaria
5280
Recurvoides ex gr.stschekuriensis /
Haplophragmoidesconcavus
no assemblage recognisable5850
Glomospira /Haplophragmoides
6050
Cribrostomoidesinfracretaceous /
Labrospiragoodenoughensis
6570
6800.0
Cribrostomoides canui
Zo
ne
Sam
ple
s
Barr
en
1512
1590
1680
1770
1860
1950
2040
2130
2220
2310
2400
2490
2580
2670
2760
2850
2940
3030
3120
3210
3315
3390
3480
3570
3660
3750
3840
3930
4020
4110
4200
4290
4380
4470
4560
4650
4740
483049204980501050405070510051305160519052205250528053105340537054005426546054905520555055805610564056705700575057805790582058505880591059605990602060506080611061406170620062306260629063206350638064106440647065006530656065706600663066606690672067506780
Absolute abundance (100mm=200 counts)
Gaudry
ina t
aill
euri
Saccam
min
a s
pp.
Am
modis
cus r
ota
lari
us
Glo
mospir
a s
pp.
Haplo
phra
gm
oid
es c
hapm
ani
Haplo
phra
gm
oid
es t
opagoru
kensis
Lituotu
ba s
pp.
indet
frag/c
rushed a
gglu
t fo
ram
s
Bath
ysip
hon b
rosgei
Hip
pocre
pin
a b
ark
sdale
iR
eophax f
uscus
Tro
cham
min
a m
cm
urr
ayensis
Vern
euili
noid
es b
ore
alis
Haplo
phra
gm
oid
es lin
ki
Tro
cham
min
a s
pp.
Am
mobaculit
es s
pp.
Haplo
phra
gm
oid
es c
oncavus
Haplo
phra
gm
oid
es lobato
locula
reR
ecurv
oid
es e
x g
r. c
annin
gensis
Recurv
oid
es e
x g
r. s
tschekuri
ensis
F&
B `
93
Recurv
oid
es s
pp.
Vern
euili
na c
ald
welli
Bath
ysip
hon v
itta
Tro
cham
min
a n
eocom
iana
Labro
spir
a g
oodenoughensis
Are
nobulim
ina m
cneili
Recurv
oid
es e
x g
r. d
isputa
bili
sH
ypera
mm
ina s
pp.
Glo
mospir
ella
arc
tica
Cri
bro
sto
moid
es infr
acre
taceous
Glo
mospir
a s
ubarc
tica
Glo
mospir
a v
ari
abili
sH
aplo
phra
gm
oid
es s
pp.
(coars
e g
rain
ed)
Lagenam
min
a s
pp.
Reophax d
eckeri
Pseudoboliv
ina r
ayi
Recurv
oid
es o
bskie
nsis
Am
mobaculit
es inele
gans
Are
nobulim
ina s
pp.
Lituotu
ba t
ort
uosa
Cri
bro
sto
moid
es c
oncavoid
es
Evolu
tinella
spp.
Uvig
eri
nam
min
a s
p.1
Wall
1983
Gaudry
ina m
illeri
Vern
euili
noid
es n
eocom
iensis
Recurv
oid
es p
aucus inflatu
sR
ecurv
oid
es p
aucus p
aucus
Gaudry
ina p
arv
aT
extu
lari
a s
pp.
Am
mobaculit
es r
etu
sus F
&B
1993
Gaudry
ina s
pp.
Tro
cham
min
a g
yro
idin
iform
isH
aplo
phra
gm
oid
es c
ushm
ani
Tro
cham
min
a r
osaceafo
rmis
Gaudry
inella
spp.
?K
uts
evella
spp.
Haplo
phra
gm
ium
irr
egula
rifo
rmis
Cri
bro
sto
moid
es c
anui
Reophax s
pp.
Am
mobaculit
es a
laskensis
Am
mobaculit
es c
f. r
eophacoid
es
Am
modis
cus o
rbis
Tro
cham
min
a w
alli
Am
mobaculit
es s
pp.
(larg
e f
rag)
1 2
1 2 2 1
1 5
1 2 1 3 7 1
1 1 3 1
2 7
1 1
1
1
2 7
5
2 3
5
1 2 9
1 2
3
5
1
1 1
1
1 1 1 1
5 2
1
1 1 1 1
1
9
2
3 1 11 3 2 1
1 21 2
11
33 3
4 3 15 6 1 7 6 1 1
3 1 1 7 3 5 1 21 1 1
1 1 9 1 1 2 8 24 2 2 21 1 3
1 4 4 1 11 1 1 33 1 6 2 1 1
1 1 12 1 1 1 1
1 1 6 2 4 21
1 3 5 2 2 21
5 1 4111 1 1 2 2 1 51 2 1 6 1
1 11 1 1
1 1 2 81 4 2 2 1 4 7 1 1
4 13 4 13 6 1 3 13 2 1 4 2 3 1 31 9 18 9 3 6 4 1 1 1
2 31 1 1 15 23 1 19 1 13 2 5 3 1 11 48 13 27 2 9 2 1 4 2 1 1 3 11 44 2 19 2 4 2 17 3 1 4 5 29
38 3 11 1 3 6 4 1 2 2 13 58 1 1 20 2 6 14 4 1 2 2 2 2 1
32 4 5 6 1 2 1 11 3 1 1 11 24 1 4 5 5 3 1 14 4 1 2 3 1
52 1 1 20 9 1 6 25 5 2 1 1 3 22 80 1 27 8 13 39 3 1 3 2
47 2 2 38 12 10 25 2 3 3 3 7 12 64 4 4 80 4 16 2 29 6 2 1 3 5 6 22 51 49 6 21 24 7 1 2 1 1
13 1 8 2 3 14 1 12 4 8 3 1 2 2 11 7 1 1 8 2 4 1 1 11 3 1 1 4 1 4 3
10 1 15 1 6 96 28 1 1 14 5 1 1 2 1 7 20 1
4 37 1 28 2 12 1 1 3 1 2 144 37 24 3 13 6 2 8 2 2 2 223 45 5 1 6 23 1 2 1 5 1 20 23 28 1 4 12 7 18 1 4 2 1 1 2 3 14 8 1 1 1
3 2 17 7 8 3 6 2 1 2 2 1 1 2 1 3 14 2 5 2 15 21 1 12 2 16 3 1 2 3 2 3 3 6 1
Foraminifera AgglutinatingAbsolute abundance (100mm=200 counts)
Gavelin
ella
spp.
Denta
lina/N
odosari
a s
pp.
(fra
gs)
Lenticulin
a m
uenste
riC
onorb
oid
es u
mia
tensis
Gavelin
ella
aw
unensis
Sara
cenari
a p
yra
mid
ata
Quadri
morp
hin
a s
p.
sensu F
&B
1993
Lagena h
aute
rivia
na h
aute
rivia
na
Valv
ulin
eri
a c
f. k
asachsta
nic
aN
odosari
a s
ceptr
um
(fr
ag)
indet
frag c
alc
benth
onic
fora
ms
Asta
colu
s s
trom
becki
Tri
stix c
f. a
cuta
ngulu
sC
onorb
oid
es w
alli
Lenticulin
a s
axocre
tacea
Lenticulin
a m
acro
dis
ca
Pseudonodosari
a s
pp.
Pra
ebulim
ina
? g
ravelli
niform
is F
&B
1993
Quin
quelo
culin
a o
pedenta
tapoly
morp
hin
ids u
ndiffe
rentiate
dLin
gulo
nodosari
a n
odosari
aS
ara
cenari
a b
rookeae
Gein
itzin
ita a
rcto
cre
tacea
Pseudonodosari
a c
f. n
etr
ona
Lenticulin
a s
pp.
(fra
gs)
Sara
cenari
a c
f. p
orc
upin
ensis
Sara
cenari
a v
ala
ngin
iana
Epis
tom
ina c
ara
colla
ante
rior
Lenticulin
a im
pre
ssa
Marg
inulin
opsis
jonesi
Nodosari
a s
pp.
Sara
cenari
a s
pp.
Lagena c
f. c
audata
sensu B
&B
1951
Asta
colu
s s
chlo
enbachi
Lagena c
f. s
ulc
ata
Pla
nula
ria s
pp.
Marg
inulin
opsis
pyra
mid
ata
Marg
inulin
opsis
spp.
Pseudola
marc
kin
a s
pp.
Lenticulin
a c
f. g
erk
iM
arg
inulin
opsis
gra
cili
ssim
aO
olin
a s
pp.
1
1
1
1
1 1 1 1
1 3 11 1
11
4
2 1 1
1 11 1 1
1 1 1 13 2 1 1 2 21 1 2 2 1 1 1
21 4 1 1 1 1 2
2 1 2 112
1 11 1
11 1
1 3 2 1 2 2 1 11 4 2 1 2 1 2 1 2 1 13 3 3 2 1 1 1 1 12 2 2 1 1 2 2 1 2 1
3 6 3 1 1 3 1 2 14 1 1 1 21 2 22 1 1
11 1 12 2 1 1 11 2 1
1 3 1 11
11
1 1 1 1 26 2 1 3 1 2 1
1 3 31 4 1 1 2 1
1 2 3 1 2 1 1 12 1 1 1 2 1 3
Foraminifera Calcareous*1
Hedberg
ella
aptiana (
pyri
tised)
Hedberg
ella
cf.
tushepsensis
(pyri
tised)
3
1
1
FOP*1
indet
cru
shed o
rnate
ostr
acod
indet
frag/c
rushed o
str
acod
?H
aplo
cyth
eri
dea s
p.
?P
ara
cypri
s s
p.
?D
olo
cyth
eri
dea s
p.
(sm
all
sm
ooth
)?
Eucyth
eru
ra s
p.
(juvenile
)S
chule
ridea s
p.1
Schule
ridea s
p.2
?Lophocyth
ere
sp.
indet
sm
all
ostr
acod
1
1
1
1
1
1 12 3 1
2 11 1
2
Ostracods*1
Pseudodic
tyom
itra
spp.
Parv
icin
gula
spp.
?O
besacapsula
spp.
Orb
iculif
orm
a s
pp.
Thanarl
a s
pp.
Xitus s
pp.
Arc
haeodic
tyom
itra
spp.
3
22 12 2 1
3 3 1 1 33 1 1 152 2 1 22 3 12
1
1 1
1
31
RadiolariaAbsolute abundance (100mm=200 counts)
shelly
debri
s
alg
al cysts
- r
ound b
row
ns
Inocera
mus d
ebri
s
Ditru
pa t
ube f
ragm
ents
gastr
opod p
roto
conch
indet
spin
es
Echin
oid
spin
es
10
13
1222426
331 10
621
31
1 1
211
12
7 11 2
2 12 1 21
7 238 17 1
4 211 105 6
332 24 43
139 10
28 56 3 26
19 3 720 12
10 2619 12
1018 2
9 3 17 1
Miscellaneous MicrofossilsAbsolute abundance (25mm=200 counts)
coal fr
agm
ents
pyri
te -
cry
sta
lline lum
ps
vegeta
tion/w
ood -
carb
onis
ed
mis
cella
neous m
egaspore
svegeta
tion/w
ood -
pyri
tised
quart
z g
ranule
s -
loose
pyri
te -
sphere
s
pyri
te -
fra
mboid
lum
ps
pyri
te -
sticks
pyri
te -
dis
coid
spelle
ts /
pelo
ids
100 1 10
60 2 21 1
21 5 21 3 1
11 1 6
15 1 5
4 60 3 2
18 4 4 3
2 1 12 1
12 12
3 1 10 4
2 21 1
31 8 2
3 27 26
51 8 24 1 1
4 3 13 2
1 3 7
6 8 18
8 18 1
2 9 6
2 16 2
31 4 51
17 3 92
7 31 6
35 2 47
14 33 1 2
11 1 1
6 1 2
2 8
62 1 10
17 2 1
10 10 1 1
9 5
8 9 1
1 38
58 37 2
71 3 46
72 23
621 10 4 12 78 71 25 1 1
71 39 1 40 8 8100 5 1 37 28 1 7
130 6 10 44 51 7 387 3 6 34 51 13 3
124 1 1 52 40 10 373 2 27 35 1 6
97 3 15 75 54 3 3117 7 58 22 2 1
103 72 32 1 176 36 1 6
66 2 1 9 29 1 41 45 2 2 30 18 3 3
67 3 36 6 1 2 260 1 1 66 5 3 2
45 23 146 3 33 1
41 8 1 38 23 7 12 1 3 35 16 2 10
41 1 61 612 2 2 47 2 4
60 6 1 30 15 5 134 7 14 3 4 1
49 2 1 39 179 139 2 5 40 1 3 636 71 1 5 10
28 9 19 1 26 2137 2 46 5 12 242 1 2 58 4
53 1 60 11 147 1 1 21 1 5 2
22 37 317 1 1 4 23 235 9 8 6 5
25 5 2 1110 10
20 2 18 83 20 1 25 1 30
12 3 6 1723 1 6 20 3
4 14 5 12 12 46 6 16 3
34 9 3 2214 5 1 84
5 33 7 4 16895 2 8 2 110
60 16 11853 8 14 93
6 35 10 5 5 227 9 1 5 1626 7 3 4 14
4 24 23 4 11 1 1 131 19 14 2 3 5 117 17 12 5
19 2 5 2 1250 2 1 1 55
12 3 3 3 5359 1 4 10 75
150 6 2 5 11188 5 4 2 90
44 1 46
Minerals Palaeoenvironment
Alaska
No
n M
ari
ne
Tra
nsit
ion
al
Inn
er
Neri
tic
Mid
dle
Neri
tic
Ou
ter
Neri
tic
Up
per
Bath
yal
Lo
wer
Bath
yal
Sam
ple
s
Barr
en
Sam
ple
depth
is B
AS
E o
f depth
range
1512
1590
1680
1770
1860
1950
2040
2130
2220
2310
2400
2490
2580
2670
2760
2850
2940
3030
3120
3210
3315
3390
3480
3570
3660
3750
3840
3930
4020
4110
4200
4290
4380
4470
4560
4650
4740
4830
4920
4980501050405070510051305160519052205250528053105340537054005426546054905520555055805610564056705700
5750578057905820585058805910
59605990602060506080611061406170620062306260629063206350638064106440647065006530656065706600663066606690672067506780
Alaska
no assemblage recognisable
1590
megaspores
2130
Haplophragmoidestopagorukensis /
Gaudryina tailleuri
3930
Bathysiphon brosgei
4980
radiolaria
5280
Recurvoides ex gr.stschekuriensis /
Haplophragmoidesconcavus
no assemblage recognisable5850
Glomospira /Haplophragmoides
6050
Cribrostomoidesinfracretaceous /
Labrospiragoodenoughensis
6570
6800.0
Cribrostomoides canui
Zo
ne
Lit
ho
str
ati
gra
ph
y
1512
Nanushuk Fm
3210
Torok Fm
5280
Pebble Shale
5790
6800.0
Kuparukequivalent
Fo
rmati
on
Ch
ron
ostr
ati
gra
ph
y
late Albian1590
middle Albian
3210
early Albian
3480
late Aptian
3930
late part of theEarly Aptian
5280
Barremian -Hauterivian
5790
Valanginian
6570
6800.0
Berriasian
Ag
e
Text Keys*1 Absolute abundance (100mm=200 counts)
PROPRIETARY
Page 41
Depth
1750'
2000'
2250'
2500'
2750'
3000'
3250'
3500'
3750'
4000'
4250'
4500'
4750'
5000'
5250'
5500'
5750'
6000'
6250'
6500'
6750'TD
Depth
500m
550m
600m
650m
700m
750m
800m
850m
900m
950m
1000m
1050m
1100m
1150m
1200m
1250m
1300m
1350m
1400m
1450m
1500m
1550m
1600m
1650m
1700m
1750m
1800m
1850m
1900m
1950m
2000m
2050mTD
Well Name : BURGER J (OCS-Y-2321)Interval Various Palynological chart
Scale : 1:5000 prepared by Jonathan Bujak for Bujak Research International
Chart date: 17 February 2016 Chukchi Sea
Jonathan Bujak
UK
Ch
ron
ostr
ati
gra
ph
y
late Albian1590
middle Albian
3210
early Albian
3480
late Aptian
3930
late part of theEarly Aptian
5280
Barremian -Hauterivian
5790
Valanginian
6570
6800.0
Berriasian
Ag
e
Lit
ho
str
ati
gra
ph
y
1512
Nanushuk Fm
3210
Torok Fm
5280
Pebble Shale
5790
6800.0
Kuparukequivalent
Fo
rmati
on
Palynological Zone
1512
K7
3480
K6
5280
K4
5790
K2
6570
6800.0
K1
Zo
ne
K7d1590
K7c
1950
K7b
3210
K7a
3480
K6b
3930
5280
K6a
Su
b Z
on
e
Mic
rop
ale
on
tolo
gic
al
assem
bla
ges
no assemblage recognisable
1590
megaspores
2130
Haplophragmoidestopagorukensis /
Gaudryina tailleuri
3930
Bathysiphon brosgei
4980
radiolaria
5280
Recurvoides ex gr.stschekuriensis /
Haplophragmoidesconcavus
no assemblage recognisable5850
Glomospira /Haplophragmoides
6050
Cribrostomoidesinfracretaceous /
Labrospiragoodenoughensis
6570
6800.0
Cribrostomoides canui
Zo
ne
Sam
ple
s
Barr
en
1512
1590
1680
1770
1860
1950
2040
2130
2220
2310
2400
2490
2580
2670
2760
2850
2940
3030
3120
3210
3315
3390
3480
3570
3660
3750
3840
3930
4020
4110
4200
4290
4380
4470
4560
4650
4740
483049204980501050405070510051305160519052205250528053105340537054005426546054905520555055805610564056705700575057805790582058505880591059605990602060506080611061406170620062306260629063206350638064106440647065006530656065706600663066606690672067506780
*1
Cyclo
psie
lla s
pp.
Pedia
str
um
bory
anum
Pte
rosperm
ella
spp.
Very
hachiu
m s
pp.
1
1 1
1
1
1
1
1
1 2 1
1
1
1
1
1
1
111
1 1
1
1
1
1 1
1
AlgaeAbsolute abundance (100mm=200 counts)
Apte
odin
ium
gra
nde
Bacchid
iniu
m p
oly
pes
Cannin
gia
colli
veri
Chic
haouadin
ium
vestitu
mC
hla
mydophore
lla n
yei (l
ong h
orn
)C
leis
tosphaeri
diu
m a
cic
ula
re
Cyclo
nepheliu
m d
istinctu
m
Endoscri
niu
m t
urn
eri
Lepto
din
ium
? h
yalo
derm
opsis
Luxadin
ium
pri
mulu
mLuxadin
ium
pro
patu
lum
Odonto
chitin
a o
perc
ula
ta
Olig
osphaeri
diu
m a
ste
rigeru
m
Olig
osphaeri
diu
m c
om
ple
x
Olig
osphaeri
diu
m t
otu
m t
otu
m
Ovoid
iniu
m s
cabro
sum
Pro
toelli
psodin
ium
spin
ocri
sta
tum
Pseudocera
tium
turn
eri
Pte
rodin
ium
alif
eru
mS
enonia
sphaera
mic
rore
ticula
taA
str
ocysta
cre
tacea
Cauca p
arv
a
Elli
psoid
icty
um
im
perf
ectu
mG
ard
odin
ium
tra
beculo
sum
Cyclo
nepheliu
m b
revis
pin
osum
`extr
em
um
`O
ligosphaeri
diu
m p
rolix
ispin
osum
Syste
mato
phora
cre
tacea
Mic
rodin
ium
seto
sum
Teham
adin
ium
tenuic
era
sS
tephodin
ium
spin
ulo
sum
Impagid
iniu
m a
lectr
olo
phum
Kle
ithri
asphaeri
diu
m s
implic
ispin
um
Occis
ucysta
tento
ria
Occis
ucysta
echin
ata
Cerb
ia t
abula
taA
chom
osphaera
verd
ieri
Pro
toelli
psodin
ium
cla
vulu
mA
pte
a a
naphri
ssa
Cyclo
nepheliu
m d
istinctu
m longis
pin
atu
m
Mudero
ngia
asym
metr
ica
Mudero
ngia
tetr
acanth
aS
ubtilis
phaera
perl
ucid
aK
leithri
asphaeri
diu
m f
ascia
tum
Lunata
din
ium
dis
solu
tum
Syste
mato
phora
cf.
com
plic
ata
Cyclo
nepheliu
m d
istinctu
m b
revis
pin
um
Olig
osphaeri
diu
m t
otu
m m
inor
Tubotu
bere
lla u
ncin
ata
Apro
bolo
cysta
eile
ma
Apte
odin
ium
spongio
sum
Batiola
din
ium
mic
ropodum
Gochte
odin
ia v
illosa
Mudero
ngia
cf.
M.
sim
ple
x s
ensu B
rideaux
& M
cIn
tyre
1980
Mudero
ngia
sim
ple
xN
elc
hin
opsis
kostr
om
iensis
Olig
osphaeri
diu
m d
iluculu
mO
ligosphaeri
diu
m s
p.
GE
McIn
tyre
& B
rideaux 8
0
Olig
osphaeri
diu
m v
asiform
e
Para
gonyaula
cysta
bore
alis
Sir
mio
din
ium
gro
ssii
Stiphro
sphaeri
diu
m d
icty
ophoru
mC
ym
ososphaeri
diu
m v
alid
um
Egm
onto
din
ium
expir
atu
mG
ochte
odin
ium
judile
ntinae
Gonyaula
cysta
dualis
Parv
ocavatu
s s
pin
osum
Gonyaula
cysta
jura
ssic
aR
hynchodin
iopsis
cla
dophora
Sentu
sid
iniu
m p
ilosum
Tubotu
bere
lla e
gem
enii
Para
gonyaula
cysta
capill
osa
Pri
odin
ium
ala
skaense
Tubotu
bere
lla e
isenackii
Ato
podin
ium
pro
sta
tum
Horo
login
ella
spin
osig
ibbero
sa
Senonia
sphaera
jura
ssic
aC
ribro
peri
din
ium
ehre
nberg
ii
2 2 1 2 1 4 1 1 1 1 1 3 2 4 1 1 2 2 2 1
2 1 2 4 1 7 4 5 1 1 1 4 1 1 2
2 3 3 3 1 1 2 3 1 2 2 2 6 1 2 1
1 2 2 6 1 2 1 1 2 1 3 1 2 1 2 1 1
2 4 5 1 3 2 1 1 1 1 1 3 1
1 3 7 2 2 3 1 1 1 1 1 1 1 1 1R
1 5 6 1 1 4 1R 1 1 1
1 1 4 4 1 1 1 6 1 1 4 1 1 1 1 1
1 2 1 6 5 4 1 1 5 1 1 1 2 1 1 1 1 1 2R
2 1 1 5 3 1 1 3 1 4 1 1 1 2 1 3 2 3
1 4 1 3 4 1 1 3 3 2 1 1 1 1 1 2 1 2 1
2 4 5 2 2 2 5 3 1 1 4 2 1 1 1 1R
2 2 1 2 1 8 1 2 1 1 3 1 1 1 1 1 2R
1 3 3 1 1 4 7 1 1 1 2 1 1 1 3 1 3 3
1 1 4 1 1 1 9 1 1 1 1 1 2 2 1 2
1 2 2 2 2 1 1 7 2 2 1 1 1
1 1 3 3 1 5 4 1 1 1 2 2 1 1
1 1 1 6 1 2 1 6 3 2 1 2 1 1 1 1 1 2
1 5 1 8 5 1 2 2 2 1
2 8 1 1 7 4 1 1 5 1 1 1 1 1 1 1 1 1R
1 1 3 7 1 2 4 2 2 1 9 1 2 1
1 1 5 4 1 1 5 3 1 1 8 1 1 1 1 1 1
4 5 3 1 2 11 2 2 2 1R
6 8 5 1 4 14 1 1 1 1
1 1 5 7 4 3 3 1 2 1 10 1 1 1 2 1
1 3 9 5 1 5 2 9 1 1 1 1
4 6 7 2 9 1 6 1 1 2 1
3 8 1 6 12 16 8 2 1 1
1 6 11 9 15 19 7 1 1 1
7 9 8 11 21 3 4 1
1 6 7 5 8 13 1 1 5 1 1 1 1 1R
1 5 8 3 6 8 1 3 1 1
2 7 5 4 8 9 1 6 1 1 1R
1 4 6 6 5 6 5 1
5 4 1 5 6 7 1 3 3 2 1 1 2
1 6 5 4 9 5 7 4 1 2 2 1 1 1 1R
7 3 1 7 8 8 2 1 1 2
4 8 6 7 9 3 1 1 1 1R5 9 3 6 11 1 2
3 12 4 3 14 3 3 14 14 1 4 10 5 1 12 11 2 9 9 4 1 1
3 10 4 8 8 6 1 1 24 9 3 5 3 5 1 12 7 7 6 4 8 1
3 8 9 4 6 5 1 2 15 9 8 5 5 37 7 5 2 6 4 2 1 16 9 8 3 8 5
9 18 9 12 45 1 1 1 1 2 1 1 11 8 21 12 11 42 2 3 2 2 1 1 13 6 23 15 9 49 1 1 4 1 3 1 1 1 1 1R2 7 25 13 7 54 4 3 1 1 1 1 1 1R 1R 1R4 8 23 1 9 8 59 1 1 1 1 1 2 3 13 5 14 7 10 67 1 6 3 2 1 1 2 2 1R 1R 1R 1R4 6 12 8 14 89 4 3 1 1 1 1 1 1 15 1 3 25 6 11 78 1 7 1 2 3 1 1 3 3 1R6 4 22 7 9 75 1 4 2 1 6 2 1 1 1 2 2 1R 1R5 1 9 26 5 13 65 3 3 1 1 5 2 1 4 1R 1R
3 8 35 1 7 9 68 1 6 2 1 8 1 1 3 3 5 1R 1R 1R 1R4 7 45 4 14 63 2 1 4 4 2 7 1 3 4 6 11 1 1R 1R 1R 1R 1R2 9 89 1 3 18 70 3 6 3 1 8 1 1 3 9 9 2 1R
3 6 78 1 4 12 66 2 3 2 9 1 1 13 12 7 1R 1R2 7 74 6 9 63 1 2 1 1 16 1 2 15 14 9 1 1R 1R4 4 56 8 7 56 2 2 1 23 1 19 17 8 1R6 5 55 7 8 51 1 1 3 3 26 1 1 4 21 6 1R 1R5 4 45 5 11 28 8 9 4 12 21 2 2 11 23 7 2 1 1 2 5 3 1 1 2 12 15 3 1 37 7 49 8 9 20 9 14 14 19 9 13 5 3 1 2 4 2 1 11 17 3 2 1 1 1R
5 6 52 7 6 13 13 21 5 17 22 1 1 8 17 6 1 2 3 1 5 1 8 21 1 1 1 2 1 1 1R 1R9 8 55 4 7 9 15 25 6 13 25 1 2 4 20 4 2 2 3 1 1 2 9 25 2 1 3 1 1 1 1R8 4 47 5 2 6 7 23 4 1 28 1 3 5 23 5 4 3 1 4 1 8 29 3 1 1 3 17 5 43 3 4 7 8 20 5 9 20 2 3 15 3 1 2 1 2 6 3 9 23 1 1 1 19 6 48 4 3 8 4 17 3 8 16 4 4 11 4 1 3 3 3 1 6 21 3 2 18 4 52 7 3 5 5 13 4 4 21 1 3 1 16 1 2 2 1 4 1 7 12 1 1 1 1 1 1R 1R
4 5 56 6 5 6 3 14 2 5 25 1 2 20 2 1 5 1 1 2 1 8 13 2 15 9 52 8 4 3 1 1 3 3 29 2 24 3 2 1 1 1 4 5 11 1 1 1 1 1R7 8 49 7 2 5 2 9 1 4 25 1 1 20 4 1 1 1 1 1 6 9 2 1 1 1 1R6 7 54 4 3 4 1 8 2 2 22 2 17 2 1 5
3 9 45 6 5 7 3 6 3 5 27 4 1 22 1 1 6 14 11 42 9 4 6 1 7 1 4 18 6 13 1 4 22 14 38 4 1 7 4 1 6 15 5 1 10 1 1 5 3
3 12 35 5 2 4 1 6 8 11 3 2 6 8 24 9 40 3 3 6 2 9 1 5 8 4 3 3 12 7 4 1R6 7 44 3 1 5 1 7 2 6 13 2 1 8 1 6 35 8 47 1 2 8 8 1 17 1 12 2 3 1 8 3 1 1 1 1 1R
8 6 52 2 3 9 1 5 1 3 20 1 15 2 1 1 1 1 7 1 1 1 1 2 17 7 46 5 12 1 6 4 25 20 1 1 1 3 1 2 19 5 36 1 4 6 4 1 2 19 1 1 14 1 1 1 4 1 1R8 3 33 1 3 9 6 2 5 9 1 2 8 2 3
4 5 32 2 4 7 7 1 4 6 1 9 1 3 2 1R5 4 35 1 5 8 4 1 2 5 1 5 5 1
3 3 29 1 2 6 5 1 8 1 4 4 22 2 31 3 7 2 1 2 3 3 2 15 1 14 3 35 1 5 3 6 1 6 5 12 2 1R1 1 26 1 6 1 8 7 4 18 2 1 1 1 1R2 2 22 1R 2 7 7 1 5 7 1 21 1
3 1 24 3 3 1 5 6 8 24 12 3 21 1 4 6 1 4 6 1 27 1 1R4 4 26 1 2 4 3 5 15 16 1 30 3 2 5 7 12
Dinoflagellate Cysts*1
Bra
chypori
spori
tes s
pp.
Plu
ricella
espori
tes s
pp.
Exesis
poro
nites s
pp.
1 3
1
1
2
1 1
1 1 3
1
1
1
1
1
1
1
1
1
21
FungiAbsolute abundance (100mm=200 counts)
Bis
accate
spp.
(long-r
angin
g f
orm
s)
Cam
aro
zonospori
tes insig
nis
Cic
atr
icosis
pori
tes a
ustr
alie
nsis
Cic
atr
icosis
pori
tes h
alle
iC
yath
idites /
Deltoid
ospora
spp.
Dis
taltri
angulis
pori
tes p
erp
lexus
Gle
icheniid
ites s
enonic
us
Laevig
ato
spori
tes o
vatu
s
Lycopodiu
mspori
tes a
ustr
ocla
vitid
ites
Osm
undacid
ites w
ellm
annii
Taxodia
ceaepolle
nites h
iatu
s
Vitre
ispori
tes p
alli
dus
Peri
nopolle
nites e
lato
ides
Contignis
pori
tes c
ooksonia
e
Rugubiv
esic
ulit
es r
ugosus
Aequitri
radites s
pin
ulo
sus
Cic
atr
icosis
pori
tes a
nnula
tus
Impard
ecis
pora
apiv
err
ucata
Rouseis
pori
tes r
eticula
tus
Kra
euselis
pori
tes r
eis
sin
geri
Appendic
ispori
tes p
roble
maticus
Calli
ala
spori
tes d
am
pie
riC
ere
bro
polle
nites m
esozoic
us
Pilo
sis
pori
tes v
eru
sE
xesip
olle
nites t
um
ulu
s
Pilo
sis
pori
tes t
richopapill
osus
Aequitri
radites v
err
ucosus
Coro
llina t
oro
sus
Cic
atr
icosis
pori
tes s
ubtr
iangulu
sD
ensois
pori
tes v
ela
tus
Lycospora
sp.
indet.
Densospori
tes s
pp.
67 2 2 1 65 1 3 15 2 33 2 1
71 1 1 1 82 1 16 2 27 3 1 2
70 3 75 3 11 1 26 5 1 1 2 1R
78 63 2 15 1 19 1 1
86 71 1 18 2 7 1
93 78 1 13 1 15 1
87 1 72 11 4 22 1 3
84 69 15 1 16 2
76 1 73 2 10 3 13 4
80 78 1 9 4 17 1 3
85 1 82 1 7 2 22 2 1
89 1 85 1 8 3 26 1 1
103 88 2 6 1 29 1
95 83 3 7 2 32 1 1 1R
90 1 79 1 9 3 27 1 2
90 75 1 5 1 23 1 1R
94 79 1 6 2 19 1
86 1 83 1 9 4 23 1
95 80 8 3 27 1 1
71 1 56 12 5 24 1
63 54 1 14 4 23 1 1 1
67 52 10 2 21 1 2 1
64 49 9 3 19 1
61 46 1 7 4 16
65 50 1 8 3 13 1 1
57 1 54 1 6 6 17 1 1
61 2 57 7 5 21 1 2 1 1
68 4 53 3 5 7 24 1
64 3 49 1 7 3 20 1 1 1 1R
56 1 45 2 9 2 16 1 1 1
63 2 48 1 8 4 12 2 2
65 50 1 4 3 15 2 1 1 1R
57 55 5 1 17 1 1 1
74 59 1 6 2 22 1 11
68 1 53 9 4 26 1
63 2 48 1 8 3 20
60 1 45 1 3 5 15 1 1 1
52 42 1 5 6 12 1 249 48 3 3 9 2
55 51 7 4 15 1 1 1 158 1 53 6 2 18 3 1 1 1R60 1 1 52 1 8 1 20
71 2 1 56 1 5 1 19 1 174 59 2 1 6 1 23 1 1
68 1 1 53 3 4 2 26 1 1 164 49 1 7 20 1 1
62 47 2 9 1 16 2 167 52 8 1 14 1 1
70 55 12 19 162 1 37 11 1 22
44 35 1 10 1 4 1 142 39 4 2 2 1R
46 35 17 3 6 1 1 1 1 1 155 40 13 1 2 1 3 1
47 37 20 1 7 1 1 1 1 2 1 1R 1R44 35 16 4 1 1 2 1
42 1 36 13 2 1 2 154 39 1 10 1 3 1 1 1 2 1 1 1 1R
57 42 8 2 6 3 1 1R49 1 45 9 1 9 1 1 1 1 1R
52 40 6 4 12 1 2 1 144 29 1 7 2 7 1 1 1 1
36 33 8 1 9 2 1 2 1 1 2 149 34 6 2 8 1 1 1 1
46 31 7 6 1 1R51 36 4 1 7 1 1 1 1
41 26 1 9 2 5 1 1R39 24 8 1 6 1 1
36 21 6 1 7 2 1 1 140 25 1 7 1 9 1 1 1R
37 1 1 22 2 4 3 5 1 138 1 23 1 2 5 6 6 1 1 1 1 1 1
34 1 1 19 3 8 5 3 1 3 1 131 16 2 7 7 4 2 2 3 1R
26 11 1 3 4 5 1 4 1 1 1 1 2 4 1R30 15 1 2 5 3 3 1 3 1 1 1 1 1 3 1
23 1 21 1 4 7 4 2 1 2 2 1 7 141 26 1 8 9 6 1 2 1 1 9 1
33 1 1 24 1 7 6 5 3 1 1 838 17 2 8 9 8 2 1 5
36 1 27 3 11 11 7 1 1 1 1 629 31 5 13 7 5 1 1 1 9 1R
39 1 30 6 10 5 6 1 1242 27 4 9 6 8 1 1 1 1 13 1R42 23 5 7 3 7 1 2 1 11
39 13 8 4 8 1 1 2 1435 11 6 5 6 1 1 1 17 1 1R
30 15 7 8 9 4 2129 14 4 9 8 1 1 22 1 1R
27 16 5 2 6 11 2 1 2 17 129 14 3 1 7 14 1 1 1 14 1R
26 11 4 3 1 13 1 1 1 17 1 1R30 15 8 2 3 10 1 2 1 1 15
33 18 7 1 2 7 3 1 2 2 1 2131 16 9 4 8 2 1 1 1 2 17
28 13 8 1 3 5 1 1 1528 19 3 3 5 9 1 1 11
25 21 5 2 6 6 4 1 2 1 1 2 123 15 4 1 8 12 1 1 2
21 12 7 1 3 7 1 1 1 2 2 1R
Spores And Pollen Palaeoenvironment
Alaska scheme
No
n M
ari
ne
Tra
nsit
ion
al
Inn
er
Neri
tic
Mid
dle
Neri
tic
Ou
ter
Neri
tic
Up
per
Bath
yal
Lo
wer
Bath
yal
Sam
ple
s
Barr
en
Sam
ple
depth
is B
AS
E o
f depth
range
1512
1590
1680
1770
1860
1950
2040
2130
2220
2310
2400
2490
2580
2670
2760
2850
2940
3030
3120
3210
3315
3390
3480
3570
3660
3750
3840
3930
4020
4110
4200
4290
4380
4470
4560
4650
4740
4830
4920
4980501050405070510051305160519052205250528053105340537054005426546054905520555055805610564056705700
5750578057905820585058805910
59605990602060506080611061406170620062306260629063206350638064106440647065006530656065706600663066606690672067506780
Mic
rop
ale
on
tolo
gic
al
assem
bla
ges
no assemblage recognisable
1590
megaspores
2130
Haplophragmoidestopagorukensis /
Gaudryina tailleuri
3930
Bathysiphon brosgei
4980
radiolaria
5280
Recurvoides ex gr.stschekuriensis /
Haplophragmoidesconcavus
no assemblage recognisable5850
Glomospira /Haplophragmoides
6050
Cribrostomoidesinfracretaceous /
Labrospiragoodenoughensis
6570
6800.0
Cribrostomoides canui
Zo
ne
Lit
ho
str
ati
gra
ph
y
1512
Nanushuk Fm
3210
Torok Fm
5280
Pebble Shale
5790
6800.0
Kuparukequivalent
Fo
rmati
on
Ch
ron
ostr
ati
gra
ph
y
late Albian1590
middle Albian
3210
early Albian
3480
late Aptian
3930
late part of theEarly Aptian
5280
Barremian -Hauterivian
5790
Valanginian
6570
6800.0
Berriasian
Ag
e
Text Keys*1 Absolute abundance (100mm=200 counts)
PROPRIETARY