Climate Change Reality: Adaptation and Mitigation … 2017 Newsletter.pdfClimate Change Reality: Adaptation and Mitigation Requires a Robust Economy John M. Armentrout Cascade Stratigraphics,

Volume 47 Number 9 May 2017 Page 1

Climate Change Reality: Adaptation and Mitigation Requires a Robust Economy

John M. Armentrout Cascade Stratigraphics, Damascus, OR

[email protected]

Climate change and global warming are issues of great concern to humankind. The geologic record docu-ments a cyclic pattern of warm versus cool climates throughout Earth’s history. Recent observations and data collections demonstrate a significant pattern of ocean and atmospheric warming. Controversy exists as to how much of this change is part of natural cycles and how much is contributed from anthropogenic greenhouse gas and aerosols. How these patterns of climate change impact society requires careful evalu-ation of data and predictive models for future climates. Realistically, our response must include both adap-tation to change and mitigation of consequences.

Adaptation is adjustment to our environment, such as retreat from the present shoreline as sea level rises or changes in planting schedules or areas as rainfall patterns shift. Mitigation involves efforts to modify or negate the consequences of environmental change, including constructing and strengthening levees to con-trol higher river discharge into an ocean with rising sea level.

Many professional organizations representing members active in energy and resource industries have a role in our understanding both climate change and global warming, and assessing the economic realities associated with a changing environment. These organizations exist to advance the science and profession of energy-related geosciences worldwide, through assembly and distribution of the best science related to the discovery and production of oil, natural gas, coal and other forms of energy, especially those considered as sustainable. Issues of peak production versus peak-demand, and sustained subsidy of renewables are clearly part of this discussion. (continued)

Pacific Section AAPG All Convention Luncheon Date & Time: Monday, May 22nd, 11:30 am – 1:00 pm

Program: Climate Change Reality: Adaptation and Mitigation Requires a Robust Economy

Speaker: John Armentrout, Cascade Stratigraphics, Damascus, OR

Place: Sheraton Anchorage, Howard Rock Ballroom B, Anchorage, AK

Reservations: Make your reservation at http://www.psaapg2017.com/luncheons

Cost: $35 per person


The necessary development of new technologies and the maintenance of the existing energy-supply infra-structure require investment capital from a robust global economy. Energy for that global economy will be supplied by fossil-fuels for the foreseeable future. The issue of responsible and ethical planning for environ-mental change is a shared task.

About the Speaker: John M Armentrout served as Co-Chair for the AAPG Global Climate Change Committee during 2008-2010, and co-convened three Climate Change Symposia and chaired a technical session on climate change at the 2008 ACE meeting. He has continued to address climate change issues and present his updated per-spective locally in Oregon.

John’s professional career included 26 years as an exploration geologist for Mobil Oil Corporation and 15 years as an international consultant and seminar teacher following retirement from ExxonMobil in 2001. He is an honorary member of the Pacific Section, and was AAPG Vice-President Sections 2007-2008.

From the President’s Desk:

The AGS busy season is coming to an end. With the PSAAPG conference at the end of May, we’ll be off and running for the busy summer season. Before we disperse, I want to thank everyone on the AGS Board and Committee Chairs for keeping the pipes flowing. It’s not always easy to find the time to devote some attention to the AGS tasks, so everyone’s efforts are greatly appreciated. A big thank you also to the PSAAPG planning committee. The planning over the last year has been a big time commitment for the committee, and the next few weeks will be a mammoth effort. Thank you for your commitment to making it a successful conference.

It was a lean year at the lectures; most likely due to the recent reductions in the petroleum industry. Every-thing considered, we had a good year for donations and memberships. Thank you for paying your member-ship dues and your donations to keep AGS financially solvent.

Larry Smith will be our AGS President next year. If you can make time, please reach out to the board mem-bers and offer your help for the next season. We are looking for a person to fill the fundraising seat, and I’m looking for a replacement for the field trip coordinator. These are chair appointments, so they have no re-quired time commitments beyond what time and effort you can put into them. The fundraising seat is very im-portant for raising our cash base, so we can do more good work like supporting geology students, inviting speakers from outside, and running technical conferences.

Cheers! ~Chad

2017 Alaska Geological Society Election Results

President: Larry Smith Past President: Chad Hults

President Elect: Greg DuBois Vice President: Keith Torrance

Secretary: Dave Buthman Treasurer: Carla Sanchez Phelps

Director 16-18: Laura Gregersen Director 17-19: Jennifer Crews

Director 16-18: Karri Sicard Director 17-19: Kirk Sherwood

Director 16-18: Steve Wright Director 17-19: Monte Mabry


Greater Prudhoe Bay at 40: Still a Giant

Dave Lachance Vice President, Reservoir Development BP Exploration (Alaska) Inc., Anchorage

Pacific Section AAPG Honors & Awards Luncheon

Pacific Section AAPG Honors & Award Luncheon Date & Time: Tuesday, May 23th, 11:30 am – 1:30 pm

Program: Greater Prudhoe Bay at 40: Still a Giant

Speaker: Dave Lachance, BP Exploration (Alaska) Inc

Place: Sheraton Anchorage, Howard Rock Ballroom B, Anchorage, AK

Reservations: Make your reservation at http://www.psaapg2017.com/luncheons

Cost: $35 per person

Key Accountabilities

As Vice President of Reservoir Development for BP in Alaska, Dave is responsi-ble for all aspects of subsurface delivery: resource identification, evaluation, de-velopment, production, new wells, well optimization, well work, and the 130 peo-ple who work in the subsurface for BP in Alaska.

Education

Dave has a mechanical engineering degree from Oklahoma State University and is a Registered Professional Engineer in the State of Colorado. He also trained as a petrophysicist at the Amoco Research Center.

Career

Dave arrived in Alaska in the summer of 2013. He has been employed with BP for over 39 years, starting in the Rocky Mountains with Amoco in the late 1970’s. His background now covers seven countries and at least fourteen BP business units; his experience covers most all types of oil and gas reservoirs and operations, onshore and offshore, including support for LNG plants in Trinidad and Indonesia. Prior to

Alaska, he was VP of Reservoir Development in Asia Pacific and in Canada. He is a member of the Society of Petroleum Engineers and has authored several technical papers.

Personal

Dave is married to Sherri and has three children and two grandchildren. He and Sherri very much enjoy living in Alaska.


http://psaapg2017.com/


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Geological Calendar of Events

Date Time Organization Event Location

May 11th GSA Laurie Weston Bellman Canadian Discovery Ltd. Data Interpretation and Integration from a Seismic Perspective – The Excitement of Innovation

May 18th 11:30 AAEP Archaeology in Your Environment. Shina DuVall, Alaska State Historic Preservation Office / Office of History and Archaeology; and Tom Wolforth, Alaska Army National Guard.

BP Energy Center, Anchorage

May 20th – 24th

AAPG Pacific Section, American Association of Petroleum Geologists Conference http://www.aapg.org/science/geographic/countries/united-states/pacific-section

Sheraton Hotel, Anchorage

May 22nd 11:30` AGS Convention luncheon. Climate Change Reality: Adaptation and Mitigation Requires a Robust Economy John Armentrout Cascade Stratigraphics

Sheraton Hotel, Anchorage ($35 per person)

May 24th 5:00pm

AGS/GSA Annual GSA/AGS picnic

Abbott Loop Community Park Pavilion, Anchorage

June 15th – 19th,

Mining History Association

Mining History Association. Annual conference http://www.mininghistoryassociation.org/FairbanksConference.htm

UAF, Fairbanks,

Aug 1st -3rd

YRITWC YRITWC 11th Biennial Summit Carcross, Yukon, Canada

Sept 19th 11:30 AGS Dr. Birgit Hagedorn, UAA (tentative) BP Energy Center, Anchorage

Oct 3rd – 4th

WTC Arctic Ambitions VI Conference Sheraton Anchorage Hotel

Oct 24th 11:30 AGS Alaska Volcano Observatory (tentative) BP Energy Center, Anchorage

Nov 5th - 11th

AMA Alaska Miners Association Annual Convention Dena’Ina Center, Anchorage

My Pet Rock Kenneth P. Helmold Alaska Division of Oil & Gas

KT boundary (KTB) exposed in the Guaniguanico Mountains of western Cuba. Well-bedded black micritic and biomicritic limestone of the Cretaceous Pons Fm. is unconformably overlain by upward fining and thinning calcareous sandstone of the Paleocene Moncada Fm. The Moncada con-tains shocked quartz, altered ve-sicular impact-melt fragments, and deformed grains of impact glass. A high Iridium peak is pre-sent at the top of the formation. The KTB results from the collision of a large asteroid with the earth that formed the Chicxulub impact crater located in the northern Yu-catan Peninsula.

Send me a photo of your pet rock!


The Oldest Representative (Early Jurassic, middle Hettangian) of the Gastropod Genus Pleurotomaria in North America (Discovered in the Pogibshi formation

near Seldovia, Kenai Peninsula, Alaska)

Mariel Ferrari1, Robert B. Blodgett2, Montana S. Hodges3 and Christopher L. Hodges3

1Instituto Patagónico de Geología y Paleontología, IPGP (CCT CONICET-CENPAT), Boulevard Alte. Brown 2915, (9120) Puerto Madryn, Provincia de Chubut, Argentina

2Blodgett & Associates, LLC , 2821 Kingfisher Drive, Anchorage, Alaska 99502 3University of Montana Paleontology Center, University of Montana, 32 Campus Drive,

Missoula, Montana 59812

Abstract

The earliest and only known Jurassic gastropod of the genus Pleurotomaria in North America is reported here from middle Hettangian strata of the lower part of the July member of the informally named Pogibshi for-mation of Kelley (1980). This unit is restricted to the southwestern part of the Kenai Peninsula west of Seldo-via, Alaska. The Pogibshi consists of marine sedimentary and volcanic rocks which are part of the widespread Peninsular terrane of southcentral Alaska. Co-occurring or closely associated with the Pleurotomaria is a new species of the pectinid subgenus Weyla (Lywea), ammonites, and scleractinian corals.

Introduction

Although Arkell (1956) recognized that the Jurassic of Cook Inlet and the Alaska Peninsula of southern Alaska represented the most complete sedimentary succession for this interval on the North American conti-nent, biostratigraphic and paleontologic studies of this region have lagged far behind other parts of western North America. In the March 2017 issue of this newsletter the oldest representatives of the bivalve genus Weyla in North America were documented from the Seldovia area on the Kenai Peninsula, southcentral Alas-ka (Hodges and others, 2017a). The genus Weyla is restricted to and characteristic of all four stages of the Lower Jurassic. The occurrence at Seldovia was noted as Weyla (Lywea) n. sp., but this species is intended to be formally named and described in the near future (Blodgett and others, in preparation).

Likewise another surprising discovery during the 2016 field season near Seldovia was the occurrence of the oldest and only known Jurassic gastropod of the genus Pleurotomaria to be found in North America. The genus has a wide chronostratigraphic distribution from the Middle Triassic to the Recent (see Begg and Grant-Mackie, 2003) and is also known from all over the world. Particularly, in the Western Hemisphere it first ap-pears during the Late Triassic in South America. Haas (1953) reported the oldest─although doubt-ful─occurrence of Pleurotomaria in the Norian-Rhaetian of central Peru. During the Early Jurassic Pleu-rotomaria has also been reported in South America by Gründel (2001) and Ferrari (2014) who mentioned some species from the early Sinemurian of northern Chile and from the late Pliensbachian-early Toarcian of north and southwestern Argentina. The first occurrence of a middle Hettangian Pleurotomaria species from North America is reported here and it is preliminary assigned to Pleurotomaria sp. This species, together with Weyla (Lywea) n. sp., is also intended to be formally named and described in the near future.

Geologic Setting

The Peninsular terrane comprises parts of southcentral Alaska and the Alaska Peninsula, and extends from near the tip of the Alaska Peninsula north and eastwards to the Copper River Basin at the east end of the Talkeetna Mountains (Jones and Silberling, 1979; Jones and others, 1981; Poulton and others, 1992; Silber-ling and others, 1992; Nokleberg and others, 1994). The outboard boundary of the Peninsular terrane is lim-ited by the Border Range fault system that extends from southwest of Afognak Island to the northeast along the western margin of the Chugach Mountains (Fig. 1). The Chugach terrane is accreted on the southern out-board side of the Border Ranges fault system.


Figure 1. Terrane map of south-central Alaska after Rioux and others (2007) showing in green a sliver of the Peninsular terrane known as the Pogibshi formation on the southern Kenai Peninsula near Seldovia. See Fig. 2 for a detail of Seldovia area.

The northeastern limit of the Peninsular terrane occurs in the southern Talkeetna Mountains. Within the Peninsular terrane are the elements of island volcanic arcs including prearc rocks, the sedimentary and less-er volcanic sequences of the Upper Triassic Kamishak Formation and the volcanic arc and postarc sedimen-tary sequences of the Lower Jurassic Talkeetna Formation (Wilson and others, 2012). The boundary between the Kamishak and Talkeetna Formations had been assumed to be the Triassic-Jurassic boundary but high precision geochronology at Puale Bay on the west side of Shelikof Strait, northeastern Alaska Peninsula, indi-cates the Kamishak continues into the early Hettangian (Pálfy and others, 1999; Barbacka and others, 2006). On the Kenai Peninsula only a sliver of the Peninsular terrane outcrops on the southwestern side of Kache-mak Bay southwest of Seldovia (Fig. 2). The sea cliffs in the area contain a fairly well-exposed continuous sequence of Late Triassic to Early Jurassic age deposits (Martin, 1915, 1926; Kelley, 1980, 1984). The Juras-sic portion of the succession has been informally referred to as the Pogibshi formation to distinguish it from the Jurassic Talkeetna Formation (Kelly, 1980, 1984). The Pogibshi formation consists of approximately 5,270 m thickness of volcaniclastic and sedimentary rocks (Kelley, 1980).


Although the Pogibshi unit has been referred to as a formation, it has not been formally named and shows many similarities to the Talkeetna Formation to which some authors have assigned it (Magoon and others, 1976; Bradley and others, 1999). The Talkeetna Formation was initially described in the Talkeetna Mountains (Martin, 1926) and later extended to areas west of the Cook Inlet (Detterman and Reed, 1980) and then con-tinuing as far south as Puale Bay on the northeast part of the Alaska Peninsula (Detterman and others, 1996). The Lower Jurassic exposures at Puale Bay had earlier been assigned to the Bidarka Formation of Kellum (1945), which seemingly included even younger strata. Both the Pogibshi and Talkeetna are of Early Jurassic age and consist of thousands of meters of volcanic, volcaniclastic rocks and both marine and non-marine sediments (Martin, 1926, Detterman and Reed, 1980; and Draut and others, 2006), but significant differences between the petrology in the Pogibshi formation and Talkeetna Formation have been noted (Kelley, 1980; Detterman and others, 1996; Wilson and others, 2012). In addition, a variance in age is also to be noted with the Pogibshi formation at Seldovia being Hettangian to early Sinemurian in age, while the Talkeetna For-mation in the Talkeetna Mountains ranges in age from late Sinemurian to Toarcian (Imlay, 1981). In relation, different units underlie the Pogibshi formation near Seldovia, the Talkeetna Formation in the Talkeetna Moun-tains, and also on the west side of Cook Inlet and at Puale Bay. The informally named Port Graham formation (Kelley, 1980, 1984) underlies the Pogibshi formation and has been shown to overlap in age with the Kamishak Formation which underlies the Talkeetna Formation on the west side of the Cook Inlet including at Puale Bay. However, these two units differ in their lithologic content and depositional environments.

Figure 2. Geologic map of the Pogibshi formation (Jp) west and southwest of Seldovia Bay. Localities JL198 and JL3 are shown by red stars. Modified from Wilson and others, 2012.


Pogibshi formation of Kelley (1980)

We report here on fossils and a dated sandstone collected from the middle member of the Pogibshi for-mation at locality JL198 and a second sandstone collected to robustly confirm the unit age from locality JL3 (Fig. 2). Kelley (1980) divided the Pogibshi into three members on the basis of rock type, modal composition, and depositional texture (Fig. 3). The stratigraphically lowest member, the Dangerous member, consists of volcaniclastic breccia, conglomerate, and sandstone in depositional contact with the also informally defined Port Graham formation of Kelley (1980). Locally tuffaceous dark-gray sedimentary rocks in the Dangerous member make it difficult to distinguish the Dangerous member from the Port Graham formation. The July member consists of dacitic pyroclastic rocks, tuffaceous sandstone, granule conglomerate, and mudstone. Kelley (1980) indicated that the high quartz content and abundance of glassy debris help to distinguish this unit from other parts of his Pogibshi formation. The uppermost member, the Naskowhak member, consists of greenish-gray tuffaceous mudstone, siltstone, and tuff. Locally, the basal part of the Naskowhak member in-cludes laterally extensive coal-bearing units that help to distinguish the Pogibshi formation of Kelley (1980) from the otherwise lithologically similar Talkeetna Formation on the west side of Cook Inlet. Bradley and oth-ers (1999) reported that the Pogibshi is intruded by the tonalite of Dogfish (Koyuktolik) Bay and possibly by the diorite of Point Bede, both in the southern Seldovia quadrangle; if so, a Late Triassic U/Pb age (205.1±4.8 Ma) on the diorite (D.C. Bradley, USGS, written commun., 2016) may indicate that the Pogibshi is in part sig-nificantly older than the Talkeetna Formation. Stanton and Martin (1905), Moffit (1906), Martin (1915, 1916, 1926), Imlay (1981) and Blodgett (2009) reported a diverse Lower Jurassic fauna along the coast southwest of Seldovia. Bradley and others (1999) erroneously attributed the Jurassic collections of Martin (1915) to the Port Graham formation of Kelley (1980), but those collections were from localities within the outcrop area Bradley and others (1999) assigned to the Talkeetna Formation, which Wilson and others (2012, 2015) reas-signed back to the Pogibshi formation of Kelley (1980). Fossils noted in the above cited publications included scleractinian corals, numerous bivalves (mostly pectinaceans), gastropods, and ammonites. Blodgett (2009) briefly visited a section of early Sinemurian age, exposed about 6 km west of Seldovia, and found numerous pectinacean bivalves of the genus Weyla, gastropods, and scleractinian corals.

The bivalve Weyla, an Early Jurassic index fossil, is found primarily along western coast of North and South America. At least two species of Weyla are present in the July member, one species being middle Het-tangian in age and the other being early Sinemurian (Blodgett, personal observation). Early Jurassic ammo-nites from these same rocks were discussed and, in part, illustrated in Imlay (1981), who recognized both Sinemurian and Hettangian fossil assemblages. The oldest fossils identified within the Pogibshi formation are early Hettangian ammonites [placed here in the middle Hettangian] found at the base of the July member (Imlay, 1981), suggesting the strong possibility that the lowest member, the Dangerous member may be en-tirely or in part of Late Triassic age. Connelly (1978) and Connelly and Moore (1979) suggested correlation of these rocks with the Upper Triassic Shuyak Formation of the Afognak Island, which is intruded by the Afognak pluton of Triassic age (see also Wilson, 2013). Rioux and others (2007) reported an age on a metamorphosed volcaniclastic rock within the Border Ranges fault system in the Anchorage quadrangle that may be equivalent to the Pogibshi formation or Port Graham formation. The sample yielded two distinct populations of zircons, reported as 202.1±1.2 Ma and 205.8±0.4 Ma.

The geochronology of the lower July member

The age of the lower part of the July member was determined by ammonite zonation and confirmed by ura-nium-lead dating at two locations (Fig. 3). The lower location is referred to as JL198 (Fig. 4) and the upper location as JL3. The respective GPS coordinates of the two locations are 59.43739º N, 151.82033º W and 59.44269º N, 151.78861º W, respectively. The continuation of the beds at JL198 (shown in the far left of Fig. 5) contain ammonites identified by Imlay (1981) as Psiloceras (Franziceras) cf. P. (F.) ruidum (Buckman) which Imlay assigned an early Hettangian age. Subsequent work by Taylor and others (2001) suggests that this ammonite interval should instead be considered as the Coronoides zone which is approximately middle Hettangian. In the beds near JL3 Imlay (1981) identified two ammonites, Paracaloceras rursicostatum Frebold and Coroniceras (Paracoroniceras) sp. which indicated an early Sinemurian age for JL3.


Figure 3. Stratigraphic composite section of the middle and upper Pogibshi formation. The position of localities JL198 and JL3 in the July member are indicated. Modified from Kelley (1980).

Sandstone samples were collected from JL3 and from the JL198 beds at an appearance of the same fos-siliferous interval at a location approximately 260 meters west of JL198. Detrital zircons were extracted from these sandstones at the Arizona LaserChron Center (ALC) and uranium-lead dated using laser ablation multi-collector inductive coupled plasma mass spectrometry (LA-MC-ICPMS) following current ALC protocols (Gehrels, 2012; Hodges and others, 2017b). The preliminary maximum depositional age of JL198 beds is middle Hettangian at 200.5 ±2.5 ±1.8 Ma from 9 zircon grains with the stated errors reported at 2σ for internal and systematic respectively. The upper JL3 sample is early Sinemurian with a preliminary maximum deposi-tional age of 198.9 ±0.62 ±2.2 Ma from 314 zircon grains. These U-Pb ages support the ammonite zonation ages established by Imlay (1981). The geochronology and biochronology will be described in detail in the near future (Hodges and others, in preparation).


Figure 4.The Early Jurassic (middle Hettangian) cliffs of site JL198, where Pleurotomaria was discovered. The fossiliferous beds are between the man's feet and shoulders.

Figure 5. The view looking east from site JL198. The fossiliferous beds are marked in red by a 1 meter scale bar. Note the change in bed dip angles shown in the photo between the near right and the far left.

Figure 6. In-situ Pleurotomaria sp. at mid-dle Hettangian locality JL198. This is the same specimen as that shown in Figs. 7A-7C.

The occurrence of the gastropod genus Pleurotomaria in the Pogibshi formation

The gastropod genus Pleurotomaria is represented by three specimens from the middle Hettangian age locality JL198 (see Fig. 2 for location and Fig. 3 for stratigraphic position within the Pogibshi formation.). The specimens found at the JL198 locality are represented by rather poorly preserved shells, although one of them shows the typical morphological characters of Pleurotomaria (Fig. 7A-7C). The taxonomic treatment and a detailed morphological description of the Pleurotomaria species are not the aim of this paper, and will be treated in a forthcoming publication. The Pleurotomaria species here reported have been found in association with Weyla and coral-bearing beds exposed at the locality JL198 (see Hodges and others, 2017a).


The vetigastropod genus Pleurotomaria shows a wide chronostratigraphic distribution from the Middle Tri-assic to the Recent and is found all over the world. Begg and Grant-Mackie (2003) supported the idea of an origin of Pleurotomaria from the late Anisian-Ladinian (Mid-Triassic) in the south-western Pacific sea. In the European epicontinental seas, Pleurotomaria first appeared during the early Hettangian and reached the Eu-ropean region through dispersal along the southern Tethyan margin (Monari and Gatto, 2013). The Late Tri-assic?-Early Jurassic radiation of Pleurotomaria from the western Tethys to North and South America may be related to the opening of a mid-Atlantic sea way, the Hispanic Corridor as earliest as the Norian times. Ac-cording to Blodgett and Frýda (2001) and Frýda and Blodgett (2003) the strong similarities between western North American Late Triassic gastropod with those of the western Tethys suggests that the Hispanic Corridor may have been open as early as the Norian. The first and oldest ─although doubtful─occurrence of Pleu-rotomaria in the Western Hemisphere dates from the Late Triassic (Norian-Rhaetian) of South America (Haas, 1953). Gründel (2001) and Ferrari (2014) have also mentioned some species from the early Sinemurian of northern Chile and from the late Pliensbachian-early Toarcian of north and south western Argentina. Based on the general shell morphology with a gradate shape and angulated outer edge of the ramp, broad seleni-zone, strongly prosocyrt nodular elements and spiral ornament dominant on adult shell, our middle Hettangian Pleurotomaria seems to represent a new species and its stratigraphic occurrence suggest it is the first and oldest reported species of the genus in North America.

Acknowledgments

This work was supported in part by a grant from the Alaskan Geological Society to Montana Hodges in support of her doctoral dissertation. This study greatly benefited from discussions with Dr. John S. Kelley (USGS retired, Anchorage) and Dr. Frederic H. Wilson (USGS, Anchorage). We also appreciate the assis-tance in field work by Dr. Bretwood Higman and family, Captain Kirby Corwin, Ben Siwiec and the dedicated staff of the Arizona LaserChron Center.

Figure 7. Pleurotomaria sp. from middle Hettangian locality JL198. Scale bar is 20 mm in length. A-C, three views of largest specimen, A, lateral view, B, basal view, and C, opposing lateral view which is a naturally-occurring cross-section showing umbilicate nature of shell with inner whorls margins clearly delineated on left side of view. D-E, intermediate sized (of the three collected) specimens, D, apertural view, E, abapertural view.


REFERENCES

Arkell, W.J., 1956, Jurassic Geology of the World: Oliver and Boyd, Edinburgh, 806 p.

Barbacka, Maria, Pálfy, József, and Smith, P.L., 2006, Hettangian (Early Jurassic) plant fossils from Puale Bay (Peninsular terrane, Alaska): Review of Palaeobotany and Palynology, v. 142, p. 33-46.

Begg, J.G., and Grant-Mackie, J.A., 2003, New Zealand and New Caledonian Triassic Pleurotomariidae (Gastropoda, Mollusca): Journal of the Royal Society of New Zealand, v. 33, p. 223-268.

Blodgett, R.B., 2009, Report on day trip (5/16/07) to visit Mesozoic rocks exposed in Port Graham and near Seldovia, southern Kenai Peninsula, p. 109-116, in LePain, D.L., Preliminary results of recent geologic investigations in the Homer, Kachemak Bay area, Cook Inlet Basin. Progress during the 2006-2007 field season: Alaska Division of Geological & Geophysical Surveys Preliminary Interpretive Report 2009-8C, p. 109-116.

Blodgett. R.B. and Frýda, Jiří, 2001, Upper Triassic gastropod biogeography of western North America: Geological Society of Ameri-ca Abstracts with Programs, v. 33, no. 3, p. A-53.

Bradley, D.C., Kusky, T.M., Haeussler, P.J., Karl, S.M., and Donley, D.T., 1999, Geologic map of the Seldovia quadrangle, south-central Alaska: U.S. Geological Survey Open-File Report 99-18, 1 sheet, scale 1:250,000.

Connelly, William, 1978, Uyak Complex, Kodiak Islands, Alaska: A Cretaceous subduction complex: Geological Society of America Bulletin, v. 89, p. 755-769.

Connelly, William, and Moore, J.C., 1979, Geologic map of the northwest side of the Kodiak and adjacent islands, Alaska: U.S. Geo-logical Survey Miscellaneous Field Studies Map MF–1057, 2 sheets, scale 1:250,000.

Detterman, R.L., Case, J.E., Miller, J.W., Wilson, F.H., and Yount, M.E., 1996, Stratigraphic framework of the Alaska Peninsula: U.S. Geological Survey Bulletin 1969-A, 74 p.

Detterman, R.L., and Reed, B.L., 1980, Stratigraphy, structure, and economic geology of the Iliamna quadrangle, Alaska: U.S. Geo-logical Survey Bulletin 1368-B, p. B1-B86, 1 sheet, scale 1:250,000.

Draut, A.E., Clift, P.D., and Blodgett, R.B., 2006, Field-trip guide to volcanic and volcanoclastic deposits of the Lower Jurassic Talkeetna Formation, Sheep Mountain, south-central Alaska: U.S. Geological Survey Open-File Report 2006-1124, 21 p.

Ferrari, S. M., 2014, Patellogastropoda and Vetigastropoda (Mollusca, Gastropoda) from the marine Jurassic of Patagonia, Argentina: Historical Biology, v. 26, no. 5, p. 563-581.

Frýda, Jiří, and Blodgett, R.B., 2003, Silberlingiella, a new purpirinid genus (Littorinoidea, Gastropoda) from the Late Middle Norian (Late Triassic) of the Clan Alpine Range, western Nevada: Mitteilungen des Geologisch-Paläontologischen Instituts der Universi-tät Hamburg, Heft 87, p. 47-54.

Gehrels, George, 2012, Detrital zircon U Pb geochronology: Current methods and new opportunities, p. 45-62, in Busby, Cathy, and Azor, Antonio, eds., Tectonics of Sedimentary Basins: Recent Advances, John Wiley & Sons, Inc.

Gründel, Joachim, 2001, Gastropoden aus dem Jura der südamerikanischen Anden: Freiberger Forschungshefte C 492, p. 43–84.

Haas, Otto, 1953, Mesozoic invertebrate faunas of Peru: Bulletin of the American Museum of Natural History, v. 101, p. 1-328.

Hodges, M.S., Hodges, C.L., Blodgett, R.B., and Stanley, George, Jr., 2017a, Preliminary investigations of Early Jurassic fossils and geochronology of the Pogibshi formation near Seldovia, Kenai Peninsula, Alaska: Alaska Geology – Newsletter of the Alaska Geological Society, v. 47, no. 7, p. 5-15.

Hodges, M.S., González-León, C.M., Stanley, G.D. Jr., and Hodges, C.L., 2017b (in press), Detrital zircon U-Pb geochronology of the Sierra de Santa Rosa Formation, Sonora, Mexico, and implications for an Early Jurassic retroarc basin, Lithosphere.

Imlay, R.W., 1981, Early Jurassic ammonites from Alaska: U.S. Geological Survey Professional Paper 1148, 49 p., 12 pls.

Jones, D.L., and Silberling, N. J., 1979, Mesozoic stratigraphy – the key to tectonic analysis of southern and central Alaska: U.S. Ge-ological Survey Open-File Report 79-1200, 39 p.

Jones, D.L., Silberling, N.J., Berg, H.C., and Plafker, George, 1981, Map showing tectonostratigraphic terranes of Alaska, columnar sections, and summary description of terranes: U.S. Geological Survey Open-File Report 81-792, 20 p., 2 sheets, scale 1:2,500,000.

Kelley, J.S., 1980, Environments of deposition and petrography of Lower Jurassic volcaniclastic rocks, southwestern Kenai Peninsu-la, Alaska: Davis, University of California – Davis, unpublished Ph.D. dissertation, 304 p.

Kelley, J.S., 1984, Geologic map and sections of the southwestern Kenai Peninsula west of Port Graham, Alaska: U.S. Geological Survey Open-File Report 84-162, 1 sheet, scale 1:63,360.

Kellum, L.B., 1945, Jurassic stratigraphy of Alaska and petroleum exploration in northwest America: Transactions of the New York Academy of Sciences, ser. 2, v. 7, no. 8, p. 201-209.

Magoon, L.B., Adkison, W.L., and Egbert, R.M., 1976, Map showing geology, wildcat wells, Tertiary plant fossil localities, K-Ar age dates, and petroleum operations, Cook Inlet area, Alaska: U.S. Geological Survey Map I-1019, 3 sheets, scale 1:250,000.

Martin, G.C., 1915, The western part of the Kenai Peninsula, in Martin, G.C., Johnson, B.L, and Grant, U.S., Geology and mineral resources of Kenai Peninsula, Alaska: U.S. Geological Survey Bulletin 587, p. 41-111.

Martin, G.C., 1916, Triassic rocks of Alaska: Geological Society of America Bulletin, v. 27, p. 685-718.


Martin, G.C., 1926, The Mesozoic stratigraphy of Alaska: U.S. Geological Survey Bulletin 776, 493 p.

Moffit, F.H., 1906, Gold fields of the Turnagain Arm region: U.S. Geological Survey Bulletin 277, p. 7-52.

Monari, Stefano, and Gatto, Roberto, 2013, Pleurotomaria Defrance, 1826 (Gastropoda, Mollusca) from the Lower Bajocian (Middle Jurassic) sediments of Luxemburg, with considerations on its systematics, evolution and palaeobiogeographical history: Pa-laeontology, v. 56, p. 751–781.

Nokleberg, W.J., Plafker, George, and Wilson, F.H., 1994. Geology of south-central Alaska, p. 311–366, in Plafker, George, and Berg, H.C., eds. The geology of Alaska. The Geological Society of America, Boulder. Colorado, The geology of North America, v. G-1.

Pálfy, József, Smith, P.L., Mortensen, J.K., and Friedman, R.M., 1999, Integrated ammonite biochronology and U-Pb geochronome-try from a basal Jurassic section in Alaska: Geological Society of America Bulletin, v. 111, no. 10, p. 1537–1549.

Poulton, T.P., Detterman, R.L., Hall, R.L., Jones, D.L., Peterson, J.A., Smith, Paul, Taylor, D.G., Tipper, H.W., and Westermann, G.E.G. , 1992, Western Canada and United States, p. 29–92, in Westermann, G.E.G., ed., The Jurassic of the Circum-Pacific: Cambridge University Press, Cambridge.

Rioux, Matthew, Hacker, Bradley, Mattinson, James, Kelemen, Peter, Blusztajn, Jurek, and Gehrels, George, 2007, Magmatic devel-opment of an intra-oceanic arc: High-precision U-Pb zircon and whole-rock isotopic analyses from the accreted Talkeetna arc, south-central Alaska: Geological Society of America Bulletin, v. 119, p. 1168-1184.

Silberling, N.J., Jones, D.L., Monger, J.W.H., and Coney, P J., 1992, Lithotectonic terrane map of the North American Cordillera: U.S. Geological Survey Miscellaneous Investigations Series Map I-2176, 2 sheets, scale 1:5,000,000.

Stanton, T.W., and Martin, G.C., 1905, Mesozoic section on Cook Inlet and Alaska Peninsula: Geological Society of America Bulletin, v. 16(1), p. 391-410.

Taylor, D.G., Guex, J., and Rakus, M., 2001, Hettangian and Sinemurian ammonoid zonation for the Western Cordillera of North America: Bulletin de la Société Vaudoise des Sciences Naturelles, v. 87, no. 4, p. 381-421.

Wilson F.H., 2013, Reconnaissance geologic map for the Kodiak and adjacent islands, Alaska: U.S. Geological Survey Scientific In-vestigations Map 2999, pamphlet 8 p., 1 sheet, scale 1:500,000.

Wilson, F.H., Hults, C.P., Schmoll, H.R., Haeussler, P.J., Schmidt, J.M., Yehle, L.A., and Labay, K.A., 2012, Geology of the Cook Inlet region, Alaska, including parts of the Talkeetna, Talkeetna Mountains, Tyonek, Anchorage, Lake Clark, Kenai, Seward, Ili-amna, Seldovia, Mount Katmai, and Afognak 1:250,000-scale quadrangles: U.S. Geological Survey Scientific Investigations Map SIM-3153, pamphlet 71 p., 2 sheets, scale 1:250,000.

Wilson, F.H., Hults, C.P., Mull, C.G., and Karl, S.M., compilers, 2015, Geologic map of Alaska: U.S. Geological Survey Scientific In-vestigations Map 3340, 196 p., 2 sheets, scale 1:584,000, http://dx.doi.org/10.3133/sim3340


AGS 2016-17 Monthly Meetings Meetings at BP Energy Center, 11:30 am – 12:45 pm (3rd Tuesday of each Month, unless otherwise noted)

September 20, 2016 (Tuesday):

Speaker: Aaron Wech, USGS Alaska Volcano Observatory Talk: Using messy seismicity to investigate earthquakes, volcanoes, and plate boundary dynamics

October 18, 2016 (Tuesday):

Speaker: Helena Buurman, UAF Alaska Earthquake Center Talk: Is she gonna blow? A seismologist's take on predicting volcanic eruptions

November 17, 2016 (Thursday):

Speaker: Elena Suleimani, Geophysical Institute, UAF Talk: Tsunami inundation mapping for Alaska coastal communities

December 8, 2016 (Thursday):

Speaker: Simon Katterhorn, joint GSA/AGS/SPE meeting, Glen Olds Hall, APU campus Talk: Controls on Continental Rift Evolution: The East African Rift in Kenya and Tanzania

December 13, 2016 (Tuesday):

Speaker: Caelus Energy Talk: Smith Bay Discovery

January 17, 2017 (Tuesday):

Speaker: Marwan Wartes, Alaska Division of Geological and Geophysical Surveys Talk: New Insights into the Regional Stratigraphy of the Brookian Sequence in Northern Alaska:Case Studies on the Power of Merging Outcrop and Subsurface Data

February 21, 2017 (Tuesday):

Speaker: Evan Twelker, Alaska Division of Geological and Geophysical Surveys Talk: Geologic Mapping in the Talkeetna Mountains and Eastern Alaska Range: A story of Mineralization and Deformation

March 21, 2017 (Tuesday):

Speaker: Carla Sanchez Phelps, Anchorage, AK Talk: Mixed Carbonate-Siliciclastic Systems: Dynamics and Controls, Eocene- Oligocene Browse Basin

April 18, 2017 (Tuesday):

Speaker: Tim Collett, USGS, AAPG Distinguished lecturer Talk: TBD

Membership Note

Membership renewal is November 1; annual dues are: Full members - $25; Students - $5



PRA

3601 C Street, Suite 822

Anchorage, AK 99503

(907) 272-1232, (907) 272-1344 (fax)

The Alaska Geological Society, Inc.

P.O. Box 101288

Anchorage AK 99510

On the web at: h p://www.alaskageology.org

The Alaska Geological Society is an organiza on which seeks to promote inter-est in and understanding of Geology and the related Earth Sciences, and to provide a common organiza on for those individuals interested in geology and the related Earth Sciences.

This newsle er is the monthly (September-May) publica on of the Alaska Geological Society, Inc. Number of newsle ers/month: ~300

EDITOR Ken Helmold

Alaska Geological Society, Inc. P. O. Box 101288

Anchorage, AK 99510 e-mail: [email protected]

(907) 269-8673 (office)

MEMBERSHIP INFORMATION

AGS annual memberships expire November 1. The annual membership fee is $25/year ($5 for students). You may download a membership applica on from the AGS website and return it at a luncheon mee ng, or mail it to the address above.

Contact membership coordinator Ken Helmold with changes or updates (e-mail: ken.helmold at alaska.gov; phone: 907-269-8673)

All AGS publica ons are now available for on-line purchase on our website. Check to see the complete catalogue:

h p://www.alaskageology.org/publica ons

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2016 ‐ 2017 Alaska Geological Society Board

Commi ees and Delegates

Title Name Phone e-mail Affiliation President Chad Hults 332-0740 chadcph at gmail.com NPS Past-President Monte Mabry 230-4488 monte.mabry at live.com President-Elect Larry Smith 865-5803 [email protected] Brook Range Petroleum Vice-President Keith Torrance 677-8257 keith.torrance at uicumiaq.com UMIAQ Treasurer Carla Sanchez Phelps 832-589-4567 carlasphelps at gmail.com Secretary Dave Buthman 344-6001 dbuthman at hilcorp.com Hilcorp Director 15-2017 Jennifer Crews 263-4516 jennifer.r.crews at conocophillips.com ConocoPhillips Director 15-2017 Greg DuBois 830-8360 gdubois at apcservicesllc.com APC Services LLC Director 15-2017 Mick Bradway brad8450 at yahoo.com Director 16-2018 Laura Gregersen 375-8240 Laura.gregersen at alaska.gov AK DOG Director 16-2018 Karri Sicard 451-5040 karri.sicard at alaska.gov AK DGGS Director 16-2018 Steve Wright 855-2363 alaskageo at aol.com Consultant

AAPG Delegate Ken Helmold 269-86733 ken.helmold at alaska.gov AK DOG

Advertising Keith Torrance 677-8257 keith.torrance at uicumiaq.com UMIAQ

Com. Ed./Science Fair Jana DaSilva Lage 980-9368 jldasilva5 at hotmail.com APICC Field Trips Chad Hults 332-0740 chadcph at gmail.com NPS Bylaws Sue Karl 786-7428 skarl at usgs.gov USGS Memberships Kirk Sherwood 334-5337 sherwook at mtaonline.net Newsletter Editor Ken Helmold 269-8673 ken.helmold at alaska.gov AK DOG Publications Mick Bradway brad8450 at yahoo.com Scholarship Sue Karl 786-7428 skarl at usgs.gov USGS Website Jan Hazen [email protected] Consultant Fundraising Sunny Foster 269-7569 sunny.foster at alaska.gov AK DEC

Title Name Phone e-mail Affiliation

PSAAPG AGS Representative Ken Helmold 269-86733 ken.helmold at alaska.gov AK DOG

Climate Change Reality: Adaptation and Mitigation … 2017 Newsletter.pdfClimate Change Reality: Adaptation and Mitigation Requires a Robust Economy John M. Armentrout Cascade Stratigraphics,

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