G E O L O G I C A L S Y M B O L SS T R A T I F I E D A N D I N T R U S I V E R O C K S
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Megascopic fold axial surface trace
Structure symbols
F antiform, upright
M synform, upright
P synform, overturned
Limit of mapping
Change in level of stratigraphic detail
Stratigraphic or intrusive contacts
defined
approximate
inferred
Faults
approximate
reverse motion, teeth on upper plate
defined
strike-slip motion
inferred
undifferentiated sedimentary rocks
chert pebble to cobble conglomerate, interstratified sandstone
fine- to coarse-grained sandstone, minor interstratified conglomerate or mudstone
thinly-bedded mudstone and siltstone
unnamed dioritic plutons and stocks
felsic dykes and stocks, unnamed
sedimentary and volcanic rocks, undifferentiated
undifferentiated sedimentary rocks
clast-supported granitoid pebble to boulder conglomerate
undifferentiated andesitic volcanic and epiclastic rocks
epiclastic rocks: red to green coarse-grained sandstone to conglomerate;medium- to thickly-bedded, cross stratification common
andesitic volcanic breccia/block tuff; hornblende+plagioclase-phyric clasts,some interstratified epiclastic rocks
undifferentiated felsic volcanic and epiclastic rocks
fine-grained crystal tuff; epiclastic conglomerate, well-bedded
flow-banded dacite to rhyolite lavas
lapilli tuff, variably welded
undifferentiated sedimentary rocks
volcanic sandstone, conglomerate, local bioclastic sandy limestone intervals
turbiditic mudstone to siltstone
thinly-bedded to massive limestone
bimodal volcanic rocks and interstratified sedimentary rocks
felsic volcanic rocks, undifferentiated
massive, aphyric flow-banded lavas, minor flow breccia
ash, lapilli tuff, non-welded to densely-welded; aphyric toquartz+k-feldspar-phyric
volcanic breccia, monolithic to slightly heterolithic
epiclastic breccia to subangular volcanic conglomerate
mafic volcanic rocks
massive andesitic to basaltic lavas; plagioclase+/-clinopyroxene-phyric
pillow lavas, broken pillow breccia, interbedded mudstone
volcanic breccia , hyaloclastite, interbedded mudstone
rhyolite lavas, autoclastic breccias
intercalated sedimentary rocks
thinly-bedded carbonaceous mudstone, turbiditic mudstone to siltstone,locally chert
Harrymel Ridge diorite
Inel porphyry
Iskut River stock: k-feldspar megacrystic monzodiorite
John Peaks Pluton hornblende diorite
Brucejack Lake k-feldspar megacrystic porphyry
Lehto Pluton: k-feldspar+porphyritic monzodiorite; monzonite and quartz diorite
k-feldspar megacrystic porphyry phase
equigranular phase
Melville pluton: hornblende+biotite diorite to quartz diorite
Mitchell/Sulphurets suite: granite, monzonite, quartz monzonite, monzodiorite
k-feldspar+plagioclase+hornblende porphyry (includes Eskay porphyry)
quartz diorite, unnamed
quartz monzonite, unnamed
Red Bluff porphyry
white crinoidal limestone
limestone clast breccia with medium-grained wacke matrix
phyllite, siliceous siltstone, minor chert
foliated plagioclase porphyry, phyllitic and tuffaceous siltstone and wacke
felsic tuff, breccia, minor lavas
unconsolidated fluvial and glacial sediments
Stikine volcanic suite: olivine+plagioclase-phyric basaltic lavas, tephra,and scoria deposits
biotite+hornblende granite, minor quartz diorite; associated dykes
Nickel Mountain olivine gabbro and related stocks
Lee Brant stock: hornblende-biotite quartz monzonite
Bronson stock diorite
diorite, locally agmatitic texture
volcanic and sedimentary rocks, undifferentiated
undifferentiated andesitic volcanic lavas, tuffs and volcanic breccia
andesitic clinopyroxene/hornblende+plagioclase-phyric block tuff,volcanic brecciaheterolithic conglomerate, mainly andesitic clinopyroxene/hornblende+plagioclase-phyric clasts
amphibole schist or gneiss
undifferentiated basaltic volcanic lavas, tuffs and volcanic breccia
basaltic clinopyroxene+plagioclase-phyric lapilli to block tuff
mafic schist or gneiss (hornblende, plagioclase; relic clinopyroxene cores)
undifferentiated sandstone, mudstone, conglomerate, limestone
thinly- to medium-bedded argillite, siltstone turbidites; interstratifiedsandstone and wacke
phyllitic metasandstone, phyllite
pale green thinly-bedded siliceous siltstone, mudstone
thinly- to medium-bedded feldspathic fine-grained sandstone/wacke;interstratified siltstone to mudstone
phyllite, siliceous phyllite
medium- to thickly-bedded coarse-grained feldspathic sandstone andtuffaceous heterolithic conglomerate
massive dark green sandstone/wacke
limestone white to grey coarsely crystalline marble
green andesitic boulder conglomerate
orange weathering, medium to coarse fossiliferous wacke phyllitic fossiliferous metasandstone
chert pebble conglomerate
phyllite to phyllitic schist
undifferentiated volcanic rocks
k-feldspar megacrystic syenite
Motion
Type
# #
normal motion, D = downthrown sideD
U
Compiled by Peter D. Lewis
Geological Legend
Geoscience BC Report 2013-05
Suggested Reference:Lewis, P. D. (2013): Iskut River Area Geology, Geological Legend; Geoscience BC Report 2013-05.
January 2013
Iskut River Area Geology
GEOLOGICAL LEGEND FOR ISKUT RIVER AREA GEOLOGY ISKUT PROJECT
vertical
inclined
vertical
inclined
fold axis
axial surface, vertical
axial surface, inclined
vertical
inclined
Flow - banding, inclined
Eutaxitic foliation, inclined
crenulation lineation
crenulation cleavage, vertical
crenulation cleavage, inclined
vertical
inclined
vertical
overturned
inclined
Fault plane
Slaty cleavage/schistosity, phase I
Slaty cleavage/schistosity, phase II
Gneissic layering
Mesoscopic fold
Crenulation fabric
Bedding, facing unknown
Bedding, facing determined
Slickenside lineation
Mineral orientation lineation
Intersection lineation
kink band boundary, inclined
kink band axis
Jurassic
BOWSER LAKE GROUP biostratigraphic limits: post-Middle Bajocianknown biostratigraphic range: Middle Bajocian to Kimmeridgian
biostratigraphic limits: post-Rhaetian, pre-Middle Bajocianknown biostratigraphic range: Hettangian-Sinemurian to Middle Bajocian
HAZELTON GROUP
biostratigraphic limits: post-Upper Aalenian, pre-Middle Bajocianknown biostratigraphic range: Bajocian
Salmon River Formation
Bruce Glacier Member John Peaks Member
biostratigraphic limits: post-Hettangian/Sinemurian, pre-Middle Bajocianknown biostratigraphic range: Upper Pliensbachian to Upper Aalenian
Betty Creek Formation
Treaty Ridge Member
Brucejack Lake Member Unuk River Member
biostratigraphic limits: post-Rhaetian, pre-Upper Pliensbachianknown biostratigraphic range: Hettangian/Sinemurian Boundary
Jack Formation
Triassic
STUHINI GROUP biostratigraphic limits: post-Permian, pre-Hettangian/Sinemurianknown biostratigraphic range: Carnian-Rhaetian
Permian
Lower Permian and Older
STIKINE ASSEMBLAGE biostratigraphic limits: pre-Upper Triassicknown biostratigraphic range: Devonian-Permian
Sedimentary unit
Felsic volcanic rocks Andesitic volcanic and epiclastic rocks
Mafic volcanic rocks
Intermediate volcanic rocks
Sedimentary rocks
Metamorphic Equivalents of Stuhini Group Rocks
Basal sedimentary unit
JrB1
JrB2
JrB3
JrDi
JrF
JrH
JrH1
JrH1a
JrH2
JrH2b
JrH2c
JrH3
JrH3a
JrH3b
JrH3c
JrH4
JrH4b
JrH4c
JrH4d
JrH5
JrH5F
JrH5Fa
JrH5Fb
JrH5Fc
JrH5Fd
JrH5M
JrB
JrH5Ma
JrH5Mb
JrH5Mc
JrH5R
JrH5S
JrH5Sa
JrHd
JrI
JrIR
JrJ
JrK
JrL
JrLb
JrLc
JrMe
JrMi
JrP
JrQd
JrQm
JrR
Pc
Plb
Pp
Pvp
Pvt
Qs
Qv
TC
TJrN
TL
TrB
TrDi
TrS
TrSi
TrSi1
TrSi2
TrSim
TrSm
TrSm1
TrSmm
TrSs
TrSs1 TrSs1m
TrSs2
TrSs3 TrSs3m
TrSs4
TrSs5
TrSs6 TrSs6m
TrSs7
TrSs8 TrSs8m
TrSs9
TrSsm
TrSv
TrSy
Stratified Rocks
Tertiary and Quaternary
COAST PLUTONIC SUITE
Intrusive Rocks
Tertiary
TEXAS CREEK PLUTONIC SUITE
Jurassic
STIKINE PLUTONIC SUITE
Triassic
Uncertain
Eskay Rhyolite Member
Troy Ridge Member