Newsletter of the Alaska Geological Society (AGS), 2012
Transcription
Newsletter of the Alaska Geological Society (AGS), 2012
The Application of LiDAR (Light Detection And Ranging) Technology to Outcrop Geology With an Example From Sagwon Bluffs on the North Slope of Alaska 1 1 2 Peter P. Flaig , Dolores A. van der Kolk , Richard Garrard , 1 1 Darrin Burton , and Lesli Wood , 1 2 University of Texas at Austin, bureau of Economic Geology, Quantitative Clastics Laboratory FEX L.P., Anchorage, Alaska LiDAR (Light Detection And Ranging) is a noninvasive, remote sensing technique that allows for rapid collection of large, 3-dimensional outcrop datasets with intrinsic qualities that include quantitative relationships and potential proxies for lithology. LiDAR is principally RADAR that uses light rather than sound waves to collect spatially referenced point clouds at ~2500 samples per second at a range of up to 800 m (ground-based LiDAR). Point clouds are rendered and analyzed in InnovMetric s 3-D metrology software Polyworks. The Quantitative Clastics Laboratory at the Bureau of Economic Geology, University of Texas at Austin curates a LiDAR Legacy dataset that now includes a recent survey recorded from Sagwon Bluffs along the Sagavanirktok River on the North Slope of Alaska. The Paleocene Prince Creek Formation (PCF) is exposed at Sagwon Bluffs in 40-120 m-high, 11 kmlong cliffs that provide an ideal outcrop analogue for a shallow North Slope petroleum reservoir. Coastal-plain facies of the PCF include conglomerate, sandstone, organic siltstone, carbonaceous shale, mudstone, and coal deposited in meandering streams, lakes, swamps, and on levees, crevasse splays, and floodplains. In outcrop, isolated channel-sands are encased in thick, muddy, organic-rich floodplain and lacustrine facies, creating potential stratigraphic traps. Alluvial architectures and thick coals suggest high subsidence/accommodation in this part of the basin during the Paleocene. Volume 42 Number 6 AGS Luncheon Date & Time: Feb. 16th, 11:30 am Program: Application of LiDAR Technology Speaker(s): Peter P. Flaig Place: BP Energy Center 1:00 pm Reservations: Please make your reservation before noon th Tuesday, Feb. 14 , 2012. Cost: Seminar only, no meal: Free Reserve a box lunch: $15 Reserve a hot lunch: $20 Lunch with no reservation: On an as-available basis only E-mail reservations: [email protected] Or phone (907) 644-4429 For more information: visit the AGS website: www.alaskageology.org Laterally extensive, near-vertical exposures at Sagwon Bluffs make detailed outcrop investigations challenging; however, spatial relationships inherent to February 2012 Page 1 separate, unique lithology: sandstone, mudstone, or coal. Cumulative probability of lithology vs. intensity plots indicate that intensities of 255-180 represent sandstone, 180-95 represent mudstone, and 95-0 represent coal. Fig. 1. Dallas Dunlap, Research Science Associate at UTAustin, calibrates the Ilris 3-D LiDAR scanner at Sagwon Bluffs the LiDAR dataset allow for precise measurement of channel length, height, and cross-sectional area with decimeter scale accuracy, even in inaccessible vertical cliffs. The intensity attribute of the data (power returned / power emitted) coupled with ground-truthing of facies can be used to identify lithologies. Statistical analyses of intensity returns from Sagwon Bluffs indicate a roughly trimodal distribution. Groundtruthing suggests that each mode represents a Fig. 2. (A) Color photograph versus (B) LiDAR intensity attribute image of fluvial sandstone, lacustrine-palustrine mudstone, and coal at Sagwon Bluffs Volume 42 Number 6 Simulated, pseudo-gamma ray logs were produced for 14 vertical data slices from intensity vs. height plots at locations lacking scree and containing clean outcrop. Pseudo-gamma ray logs are intended to mimic the subsurface gamma-ray tool response to changing lithologies. Model net:gross was calculated for each slice and provided an improved estimate relative to calculated net:gross from stratigraphic columns. Rare North Slope outcrop belts such as Sagwon Bluffs located near known hydrocarbon accumulations offer a glimpse into facies, alluvial architecture, sandbody geometries, and stacking pattern that is difficult to resolve from seismic and core alone. Analysis of LiDAR datasets from these outcrops will enhance geospatial models, improve net:gross calculations, reduce risk, and increase production. Fig. 3. Pseudo-gamma ray log produced from Sagwon Bluffs LiDAR intensity returns February 2012 Page 2 About the Speaker: th Pete was born in Milwaukee during a blizzard on December 28 1968, the same day Apollo 8 astronauts Frank Borman, James Lovell, and William Anders (the first humans ever to see the far side of the moon) were plucked from their space capsule floating in the South Pacific. Pete began his career as a professional photographer and custom printer. In 2002 he earned a B.S. in Geology from the University of Wisconsin-Milwaukee (UWM). In 2003 Pete was offered a unique opportunity to join a field team in the central Transantarctic Mountains of Antarctica. During the 2003-2004 Antarctic field season Pete examined a Permian through Triassic alluvial succession to identify the impetus behind changing facies, flora, fauna, fluvial style, accommodation, and stacking pattern across the PermianTriassic boundary in the Beardmore Glacier Region of Antarctica. He earned his M.S. from UWM in 2005. In 2005 a phone call from Paul McCarthy at the University of Alaska-Fairbanks (UAF) changed his life. Pete joined a team of scientists investigating the dinosaur-bearing Prince Creek Formation, a Cretaceous fluvialdeltaic succession exposed along the Colville River on the North Slope of Alaska. Pete s role as a sedimentologist was to reconstruct the Cretaceous coastal-plain of Arctic Alaska, placing the dinosaurs in a paleoenvironmental context. Pete lived in Fairbanks for 4 years (2005-2009) and attended UAF where he met his wife Dolores van der Kolk. During this time he also conducted an intern project for FEX/Talisman in Anchorage involving the integration of surface and sub-surface data for the Late Cretaceous to Early Tertiary of the North Slope State lands. He received his Ph.D. from UAF in 2010. Pete moved to Austin, Texas in 2009 to accept a Postdoctoral Fellowship at the Jackson School of Geosciences, University of Texas at Austin (UT-Austin). Pete s postdoctoral work included continuing research on North Slope fluvial-deltaic and shallow marine systems, investigations of other Cretaceous Western Interior Seaway deposits, and examination and expansion of the LiDAR Legacy database stored at the Bureau of Economic Geology (BEG). In 2009 Pete and Dolores acquired the first ground-based LiDAR dataset in northern Alaska at Sagwon Bluffs, adding to sedimentologic investigations from previous field seasons there. Pete joined a team of scientists in 2010-2011 for his second Antarctic field season in the Pete and Dolores, November 2011 central Transantarctic Mountains. Pete and Steve Hasiotis from the University of Kansas collaborated and expanded on previous work, examining facies and trace fossil assemblages from the Devonian through the Jurassic with a goal of reconstructing ancient Antarctic ecosystems. Pete recently accepted a Research Associate position as a sedimentologist-stratigrapher at the BEG, UT-Austin where he is the lead scientist on fluvial-deltaic studies at the Quantitative Clastics Laboratory (QCL). Pete s current research, in conjunction with Dolores van der Kolk s Ph.D research, involves understanding facies-changes, ichnofacies variations, and the interfingering relationship between the continental Prince Creek Formation and shallow marine Schrader Bluff Formation on the North Slope. th This summer will mark his 10 field-program on the Slope. Pete also provides expertise and advises graduate students on QCL consortium company projects and is involved in planning for the next deep field Antarctic camp in the Transantarctic Mountains of interior Antarctica. From the President s Desk As I announced at January s luncheon Steve Wright, the President-Elect of the Alaska Geological Society, will be leaving Alaska to accept a new position with Chevron in the lower 48. Consequently the AGS board is looking for volunteers to step into Steve s position. If you have an avid interest in Alaskan geology, like working with people, and have spare time to donate to the society, please consider stepping up to fill the vacancy. Anyone interested can contact me at [email protected] . AGS currently stores publications and miscellaneous material at the Bayview core facility run by ConocoPhillips. The facility is scheduled for closure later this year so the board is looking for an alternate site to permanently store this material. If you know of Volume 42 Number 6 an appropriate location, hopefully somewhere in Anchorage with easy access, please contact Peter Johnson, chairman of the publication committee, at [email protected] . This month s luncheon presentation by Peter Flaig of the Texas Bureau of Economic Geology will be on The application of LiDAR (Light Detection And Ranging) technology to outcrop geology with an example from Sagwon Bluffs on the North Slope of Alaska . This new technology promises revolutionize the manner in which outcrops are analyzed, so come early to get a good seat. February 2012 - Page 3 Ken ALASKA FOSSIL OF THE MONTH MONOTIS (PACIMONOTIS) SUBCIRCULARIS GABB, 1864 For most information on this useful I recommend the following papers provided in the References cited below. by Robert B. Blodgett This month s selection for the Alaska Fossil of the Month is the widespread index fossil bivalve, Monotis (Pacimonotis) subcircularis Gabb, which has long been appearing in faunal lists from Upper Triassic strata of Alaska. Not only is this species widespread and abundant throughout rocks of this age in Alaska (see Figs. 1-4), making it invaluable in geological mapping, but it is also commonly found in mass occurrences in many potentially significant source beds for petroleum such as the Shublik Formation on the North Slope, as well as the Kamishak Formation on the upper Alaska Peninsula. The species was named by William M. Gabb (1839-1878), a well-known 19th Century geologist, who was a pioneer in describing many of California s Mesozoic and Cenozoic age fossils. The species is the most widespread and the commonest species among North American representatives of the genus Monotis. It stratigraphic occurrence appears to limited to the lower part (Cordilleranus Zone) the upper Norian Stage. The Norian, which comprises the medial stage of the Upper Triassic, ranges from 216.5 2.0 to 203.6 1.5 million years ago. This species had a paleolatitudinally wide geographic distribution along the western margin of the Americas, extending in the north from the Canadian Arctic Islands south to western margin of South America as far south as Chile. It occurs in Alaska both on the craton in east-central Alaska, as well as in numerous accreted terranes (or subterranes) throughout the rest of the state. According to Silberling and others (1997) these included the following: North Slope, Endicott Mountains, De Long Mountains, Nixon Fork, Nyac?, Togiak, Chulitna, Sustina, Nenana, Stikinia, Wrangellia, Peninsular, and Alexander terranes (or subterranes). The widespread character of monotid bivalves is thought be the result of a presumed attached-floating mode of Volume 42 Number 6 life (assumed by most, but not all paleontologists), attached to objects such as seaweeds. REFERENCES Blodgett, R.B., 2008, Paleontology and stratigraphy of the Upper Triassic Kamiskak Formation in the Puale Bay-Cape KekurnoiAlinchak Bay area, Karluk C-4 and C-5 Quadrangle, Alaska Peninsula, p. 131-160, in Reifenstuhl, R.R., and Decker, P.L., eds., Bristol Bay--Alaska Peninsula region, Overview of 2004--2007 Geologic Research: Alaska Division of Geological & Geophysical Surveys Report of Photo by 2008-1. James Buchanan Investigations Can you name this rock formation? 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. Gabb, W.M., 1864, Description of the Triassic fossils of California. California Geological Survey, Paleontology, volume 1, p. 19-35. Grant-Mackie, J.A., and Silberling, N.J., 1990, New data on the Upper Triassic bivalve Monotis in North America, and the new subgenus Pacimonotis: Journal of Paleontology, v. 64, p. 240-254. Martin, G.C., 1916, Triassic rocks of Alaska. Bulletin of the Geological Society of America, v. 27, p. 685-718. February 2012 Page 4 Silberling, N.J., 1963, Field guide to halobiid and monotid pelecypods of the Alaskan Triassic. U.S. Geological Survey Open-File Report 63-119, 10 p., 6 pls. Silberling, N. J., 1985, Biogeographic significance of the Upper Triassic bivalve Monotis in circum-Pacific accreted terranes, in Howell, D. G., ed., Tectonostratigraphic Terranes of the Circum-Pacific Region: Circum-Pacific Council for Energy and Mineral Resources Earth Sciences Series No. 1, p. 63-70. Silberling, N.J., Grant-Mackie, J.A., and Nichols, K.M., 1997, The Late Triassic bivalve Monotis in accreted terranes of Alaska: U.S. Geological Survey Bulletin 2151, 21 p. Figure 2. Line drawing for a specimen of Monotis (Pacimonotis) subcircularis from Puale Bay (referred to at the time of publication as Cold Bay ) on the Alaska Peninsula (from Martin, 1916). Stanton, T.W., and Martin, G.C., 1905, Mesozoic section on Cook Inlet and Alaska Peninsula: Bulletin of the Geological Society of America, v. 16, p. 391-410. Figure 1. Bedding plane in lower part of Kamishak Formation at Puale Bay, east (Pacific) side of the upper Alaska Peninsula, entirely covered with Monotis (Pacimonotis) subcircularis (from Blodgett, 2008). Volume 42 Number 6 Figure 3. Photo of fragmentary specimens of Monotis (Pacimonotis) subcircularis found in folded argillite on west side of Port Graham, Kenai Peninsula, south-central Alaska (photo from Blodgett, 2009, provided to him by Andrew Caruthers of University of British Columbia, Vancouver, B.C.). February 2012 Page 5 Figure 4. Bedding surface covered with Monotis (Pacimonotis) subcircularis from the west side of the Killik River, northern Alaska (from Silberling and others, 1997, Pl. 7, fig. 5). A TRIBUTE TO NORMAN J. SILBERLING (1928-2011) by Robert B. Blodgett Norman J. Silberling Volume 42 Number 6 This note honors Norman J. Silberling, an outstanding geologist who has done much to further the knowledge of Alaskan and Cordilleran tectonics, as well as Triassic paleontology. Norm was born November 28, 1928 in Oakland, California and received a Ph.D. in geology at Stanford University, where he was a student of Si Mueller. Norm served in the U.S. Navy during the Korean War and received two combat stars. His career included work at both the Branch of Paleontology and Stratigraphy of the U.S. Geological Survey and on the faculty of Stanford University. He was pre-eminent for his work on Triassic ammonoids and flat-clams (including monotids, Halobia, and Daonella), Triassic stratigraphy of the western U.S., as well as in structural geology, where he was one of the early leading proponents of terrane analysis of the western North American Cordillera. Together with Davy Jones, a Cretaceous paleontological specialist with the USGS, they named the vast majority of tectonostratigraphic terranes recognized in Alaska. Norm passed away on September 27, 2011 in Lakewood, Colorado. He is survived by his widow, Kathyrn M. Nichols, also a geologist and long-standing colleague. He will be sorely missed by a numbers of paleontologists who have vastly benefited from his sage and fatherly advice, including myself, George Stanley, Jr., Christopher McRoberts, Michael Sandy, Spencer Lucas, and Mike Orchard, and numerous other Triassophiles. February 2012 Page 6 BIBLIOGRAPHY OF SILBERING PAPERS RELATING TO ALASKAN GEOLOGY Silberling, N.J., 1963, Field guide to halobiid and monotid pelecypods of the Alaskan Triassic: U.S. Geological Survey Open-File Report 63-119, 10 p., 6 pls. Silberling, N.J., and Patton, W.W., Jr., 1964, Triassic rocks of Brooks Range; in Geological Survey Research 1964, Chapt. A.: U.S. Geological Survey Professional Paper 501-A, p. A116. Silberling, N.J., 1965, New zonation of Triassic Shublik Formation, Alaska, in Geological Survey Research 1965, Chapt. A.: U.S. Geological Survey Professional Paper 525-A, p. A123. Silberling, N.J., and Tozer, E.T., 1968, Biostratigraphic classification of the marine Triassic in North America. Geological Society of America Special Paper 110, 63 p. Armstrong, A.K., MacKevett, E.M., Jr., Jr., and Silberling, N.J., 1969, The Chitistone and Nizina Limestones of part of the southern Wrangell Mountains a preliminary report stressing carbonate petrography and depositional environments: U.S. Geological Survey Professional Paper 650-D, p. D49-D62. Silberling, N.J., 1971, Geologic events during Permian-Triassic time along the Pacific Margin of the United States (Abs.): Bulletin of the Canadian Society of Petroleum Geology, v. 19, p. 355. Silberling, N.J., 1973, Geologic events during Permian-Triassic time along the Pacific Margin of the United States, in Logan, A., and Hills, L.V., eds., The Permian and Triassic Systems and their mutual boundary: Canadian Society of Petroleum Geologists Memoir 2, p. 345-362. Jones, D.L., Silberling, N.J., and Hillhouse, John, 1977, Wrangellia a displaced terrane in northwestern North America: Canadian Journal of Earth Sciences, v. 14, no. 11, p. 2565-2577. Silberling, N.M., Jones, D.L., Scejtey, Bela, and Nelson, W.H., 1978, Interpretive bedrock geologic map of the Upper Chulitna district, Healy A-6 quadrangle, Alaska Range, Alaska: U.S. Geological Survey Open-File Report 78-545. Jones, D.L., Silberling, N.J., and Hillhouse, J.W., 1978, Microplate tectonics of Alaska Significance for the Mesozoic history of the Pacific Coast of North America, in McDougall, K.A., and Howell, D.G., eds., Mesozoic paleogeography of the western United States: Society of Economic Paleontologists and Mineralogists, Pacific Section, Pacific Coast Paleogeography Symposium 2, p. 71-74. Jones, D. L., Silberling, N. J., 1979, Mesozoic stratigraphy the key to tectonic analysis of southern and central Alaska: U.S. Geological Survey Open-File Rept. 79-1200, 37 p. Jones, D. L., and Silberling, N. J., 1979, Mesozoic accretionary tectonics of southern and central Alaska: Geological Society of America Abstracts with Programs, v. 11, p. 452. Silberling, N. J., Richter, D. H., and Jones, D. L., 1979, Recognition of Wrangellia in the Talkeetna and Clearwater Mountains, northcentral Alaska: Geological Society of America Abstracts with Programs, v. 11, p. 517. Nichols, K. M., and Silberling, N. J., 1979, Early Triassic (Smithian) ammonites of paleoequatorial affinity from the Chulitna terrane, south-central Alaska: U.S. Geological Professional Paper 1121-B, p. B1-B5, 3 pls. Jones, D. L., Silberling, N. J., and others 1980, Age and structural significance of ophiolite and adjoining rocks in the Upper Chulitna district, south-central Alaska: USGS Professional Paper 1121-A, 21 p., 2 pls. Plafker, George, Hudson, Travis, and Silberling, N. J., 1980, Late Triassic fossils from a sequence of volcanic and sedimentary rocks on the Chilkat Peninsula, SE Alaska: U.S. Geological Survey Circular 804-B, p. 107-110, fig. 49. Silberling, N. J., and Jones, D. L., 1980, Mesozoic accretionary tectonics of Alaska (abs.): American Association of Petroleum Geologists Bulletin, v. 64, p. 784. Coney, P. J., Silberling, N. J., and Jones, D. L., 1980, Accretionary tectonic styles in the Alaska Range (abs.): EOS, v. 61, p. 1114. Jones, D. L., Silberling, N. J., Gilbert, Wyatt, and Coney, P. J., 1980, Age, character, and distribution of accreted terranes in the central Alaska Range, south-central Alaska (abs.): EOS, v. 61, p. 114. Silberling, N. J., Richter, D. H., and Jones, D. L., 1981, Recognition of Wrangellia in the Clearwater Mountains and vicinity, south-central Alaska, p. B51-B55, in Albert, N. R. D., and Hudson, Travis, eds., The United States Geological Survey in Alaska: Accomplishments during 1979: U.S. Geological Survey Circular 823-B, p. B51-B55. Coney, P. J., Silberling, N. J., Jones, D. L., and Richter, D. H., 1981, Structural relations along the leading edge of Wangellia in the Clearwater Mountains, Alaska, p. B56-B59, in Albert, N. R. D., and Hudson, Travis, eds., The United States Geological Survey in Alaska: Accomplishments during 1979: U.S. Geological Survey Circular 823-B. Jones, D. L., Silberling, N. J., Wardlaw, B. R., and Richter, D. H., 1981, Revised ages of Paleozoic and Mesozoic rocks in the Talkeetna quadrangle, south-central Alaska, p. B46-B49, in Albert, N. R. D., and Hudson, Travis, eds., The United States Geological Survey in Alaska: Accomplishments during 1979: U.S. Geological Survey Circular 823-B. Jones, D. L., Silberling, N. J., Berg, H. C., and Plafker, George, 1981, Tectonostratigraphic terrane map of Alaska: U.S. Geol. Survey Open-File Rept. 81-792, map, expl. sheet, and 20 p. text. Silberling, N. J., Richter, D. H., Jones, D. L., and Coney, P. C., 1981, Geologic map of the bedrock parts of the Healy A-1 quadrangle south of the Talkeetna-Broxson Gulch fault system, Clearwater Mountains, Alaska: U.S. Geol. Survey Open-File Report 81-1288. Volume 42 Number 6 February 2012 Page 7 Jones, D. L., Silberling, N. J., Berg, H. C., and Plafker, George, 1982, Tectonostratigraphic terrane map of Alaska, p. 105, in Coonrad, W. L., and Elliott, R. L., eds., The United States Geological Survey in Alaska: Accomplishments during 1980: U.S. Geological Survey Circular 844. Silberling, N. J., Wardlaw, B. R., and Berg, H. C., 1982, New paleontologic age determinations from the Taku terrane, Ketchikan area, southeast Alaska, op cit. p. 117-119, in Coonrad, W. L., and Elliott, R. L., eds., The United States Geological Survey in Alaska: Accomplishments during 1980: U.S. Geological Survey Circular 844. Jones, D. L., Silberling, N. J., Gilbert, W. G., and Coney, P. J., 1982, Character, distribution, and tectonic significance of accretionary terranes in the central Alaskan Range: Jour. Geophysical Research, v. 87, no. B5, p. 3709-3717. Jones, D. L., and Silberling, N. J., 1982, Mesozoic stratigraphy the key to tectonic analysis of southern and central Alaska, in Leviton, A., et al., eds., Frontiers of geological exploration of western North America: American Assoc. Advancement of Science, Pacific Div., Symposium, p. 139-153. Jones, D. L., Silberling, N. J., and Coney, P. J., 1982, Timing of major accretionary events in Alaska (Abstract): Eos, v. 63, no. 45, p. 913-914. Jones, D. L., and Silberling, N. J., 1982, Stratigraphic analysis of accreted terranes in the cordillera of western North America (Abstract): Geological Society of America Abstracts with Programs, v. 14, p. 523. Coney, P. J., Silberling, N. J., and Jones, D. L., 1983, Oceanic crustal telescoping and the growth of continents: accretionary tectonics in Alaska (Abstract): Geological Society of America Abstracts with Programs, v. 15, no. 5, p. 427. Silberling, N. J., and Jones, D. L., 1983, Paleontologic evidence for northward displacement of Mesozoic rocks in accreted terranes of the western Cordillera (Abstract): Geological Association of Canada, Program with Abstracts v. 8, p. A62. Jones, D. L., and Silberling, N. J., 1983, Paleobiogeographic significance of Circum-Pacific allochtonous terranes (Abstract): Bulletin of Marine Science, v. 33, p. 779. Jones, D. L., Silberling, N. J., and Coney, P. J., 1983, Interpretive bedrock geologic map of the Mount McKinley region and Tectonostratigraphic map of the Mt. McKinley region: U.S. Geological Survey Open-File Report 83-11, 2 sheets. Jones, D. L., Silberling, N. J., Chapman, R. M., and Coney, P. J., 1984, New ages of radiolarian cherts from the Rampart district, east-central Alaska, p. 39-43, in Coonrad, W. L., and Elliott, R. L., eds., The United States Geological Survey in Alaska: Accomplishments during 1981: U.S.Geological Survey Circular 868. Silberling, N. J., and Jones, D. L., editors, 1984, Lithotectonic terrane maps of the North American Cordillera: U.S. Geological Survey Open-File Report 84-523, 104 p. text, 4 map sheets at 1:2,500,000. Jones, D. L., Silberling, N. J., Coney, P.J., and Plafker, George, 1984, Lithotectonic terrane map of Alaska (west of the 141st Meridian) Part A, in Silberling, N. J., and Jones, D. L., eds., Lithotectonic terrane map of the North American Cordillera: U.S. Geological Survey Open-File Report 84-523, p. A1-A12, map sheet. Silberling, N. J., 1985, Biogeographic significance of the Upper Triassic bivalve Monotis in Circum-Pacific accreted terranes, in Howell, D. G., ed., Tectonostratigraphic terranes of the Circum-Pacific region: Circum-Pacific Council for Energy and Mineral Resources, Earth Science Series, no. 1, p. 63-70. Nokleberg, W. J., Jones, D. L., and Silberling, N. J., 1985, Origin, migration, and accretion of the Maclaren and Wrangellia terranes, eastern Alaska Range, Alaska: Geological Society of America Bulletin, v. 96, p. 1251-1270. Jones, D. L., Silberling, N. J., and Coney, P. J., 1986, Collision tectonics in the Cordillera of western N. America: examples from Alaska,in Coward, M. P., and Riess, A. C., eds., Collision tectonics: Geological Society (of London) Special Publication No. 19, p. 367-387. Silberling, N. J., and Jones, D. L., editors, 1987, Lithotectonic terrane map of (A) Alaska (west of the 141st Meridian), (B) western Canada and southeastern Alaska, (C) western conterminous United States, and (D) Mexico (west of the 91st Meridian): U.S. Geological Survey Miscellaneous Field Studies, Maps MF-1874-A, -B, -C, and -D. Jones, D. L., Silberling, N. J., Coney, P. J., and Plafker, George, 1987, Lithotectonic terrane map of Alaska (west of the 141st Meridian):U.S. Geological Survey Miscellaneous Field Studies, Map MF-1874-A. Dutro, J. T., Jr., and Silberling, N. J., 1988, Megafossil biostratigraphy of some deep test wells, NPRA, northern Alaska, in Gryc, George, ed., Geology and exploration of the National Petroleum Reserve in Alaska, 1974 to 1982: U.S. Geological Survey Professional Paper 1399, p. 667-675, pls. 30.1-30.4. Plafker, George, Blome, C. D., and Silberling, N. J., 1989, Reinterpretation of lower Mesozoic rocks on the Chilkat Peninsula closer ties with Wrangellia: Geology, v. 17, p. 3-6. Grant-Mackie, J. A., and Silberling, N. J., 1990, New data on the Upper Triassic bivalve Monotis in North America, and the new subgenus Pacimonotis: Journal of Paleontology, v. 64, p. 240-254. 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 Map I-2176, scale 1:5,000,000. Silberling, N.J., Jones, D.L., Coney, P.J., Berg, H.C., and Plafker, G., 1994, Lithotectonic terrane map of Alaska, in Plafker, G., and Berg, H.C., eds., The geology of Alaska: Boulder, Colorado, Geological Society of America, The Geology of North America, v. G1, pl. 3, scale 1:2,500,000. Silberling, N.J., Grant-Mackie, J.A., and Nichols, K.M., 1997, The Upper Triassic bivalve Monotis in accreted terranes of Alaska: U.S.Geological Survey Bulletin 2115, 21 p., 11 pls. Volume 42 Number 6 February 2012 Page 8 The Alaska Geological Society LUNCHEON SCHEDULE 2011 - 2012 Updates on the web at: http://www.alaskageology.org th September 2011 Thursday, Sept. 15 , Paul Decker, DNR Source-Reservoired Oil Resources, North Slope Alaska October 2011 Thursday, Oct. 20 , Kristine Crossen and David Yesner, UAA, Youngest Mammoths in America: 5700 Year Old Mammoth Remains from Qagnax Cave, Pribilof Islands, Alaska November 2011 Thursday, Nov. 17 , Tom Homza, Shell Exploration & Production, Toward an Integrated Model for the Canada Basin: Implications for North Alaska December 2011 Thursday, Dec. 8 Tad Smith (SEG 2011 Honorary Lecturer), Apache Corporation, Practical Seismic Petrophysics: The Effective Use of Log Data for Seismic Analysis (Joint meeting AGS / GSA) January 2012 Thursday, Jan 19 Sue Karl, U.S. Geological Survey: Rare Earth Element Deposits, Bokan Mt., SE Alaska February 2012 Thursday, Feb. 16 Peter Flaig, UTAustin BEG, Application of LiDAR March 2012 Thursday, Mar. 15 Rodney Graham (AAPG Distinguished Lecturer), Research Associate, Cambridge, UK, Exploration in Fold & Thrust Belts A Personal Perspective April 2012 Thursday, Apr. 19 Craig Knutson & Andy Bond, Pioneer Natural Resources Alaska Inc., Geology & Reservoirs of the Oooguruk Field May 2012 Thursday, May 17 April Parsons, Statoil (Chukchi Sea topic) th th th th th th th th If you would like to volunteer a talk or would like to suggest a speaker, please contact Dick Garrard at 644-4429. Volume 42 Number 6 February 2012 Page 9 Meeting Information The American Geological Institute provides a comprehensive list of national and international geoscience meetings at: http://calendar.agiweb.org Enhanced Alaska Digital Well Log Data Since 1989 Local Meetings: American Water Resources Association Alaska Section http://www.awra.org/state/alaska/index.html Alaska Geological Society http://www.alaskageology.org Lunch meetings are held monthly September through May in Anchorage. For more information, contact Jim Clough, 4515030. Alaska Miners Association http://www.alaskaminers.org/ The Anchorage branch of the AMA holds weekly meetings at 7 AM every Friday at the Denny s on Northern Lights and Denali. They hold regular luncheon meetings in association with SME. For more information, contact the AMA office at 563-9229. American Institute of Professional Geologists http://www.aipg.org AIPG holds regular quarterly evening Section meetings in Anchorage and Fairbanks. For more information contact Mark Lockwood, President, at Shannon & Wilson, Inc., in Fairbanks, 907-458-3142. OCS, 95 out of 100 Alaska OCS wells. Mud logs for some. North Aleutian Basin wells, onshore and offshore. North Slope, 556 wildcats and key field wells. Kuparuk River Field, first 567 wells drilled (pre-1985). Southern Alaska, 1063 wells including all wildcats and many field wells. Directional surveys for most. All digital log files Are depth shifted to match resistivity curves. Have core data rendered as a depth-shifted well log curve. Have SP both in original form and as a straightened curve. Have standardized mnemonics. Have Volume of Shale curves, derived from gamma ray for North Slope, derived from SP for Cook Inlet. Allow you to specify your own choice of mnemonics before delivery. Are updated periodically with new wildcat wells. Are delivered in LAS 2.0 format. Contact Dan Shier: Chugach Gem & Mineral Society http://www.chugachgms.org CG&MS holds all meetings at the First United Methodist Church on th 9 Avenue. Contact their hotline at 566-3403 for information on regular monthly business meetings, monthly potlucks, and guidebook sales, including the new Alaska Rockhound Guidebook. 303-278-1261 [email protected] www.rockypine.com Geophysical Society of Alaska http://gsa.seg.org/ Luncheon meetings are held monthly September through May at the ConocoPhillips Tower. For more information, contact Daniel Yancey, [email protected] Society of Petroleum Engineers http://alaska.spe.org/ UAS Environmental Science Program http://www.uas.alaska.edu/envs National Association of Geology Teachers (NAGT) http://www.nagt Volume 42 Number 6 February 2012 Page 10 The Alaska Geological Society, Inc. P.O. Box 101288 Anchorage AK 99510 On the web at: http://www.alaskageology.org The Alaska Geological Society is an organization which seeks to promote interest in and understanding of Geology and the related Earth Sciences, and to provide a common organization for those individuals interested in geology and the related Earth Sciences. This newsletter is the monthly (September-May) publication of the Alaska Geological Society, Inc. Number of newsletters/month: ~300 EDITOR Greg Wilson Alaska Geological Society, Inc. P. O. Box 101288 Anchorage, AK 99510 e-mail: Gregory.c.wilson at conocophillips.com (907) 263-4748 (office) MEMBERSHIP INFORMATION AGS annual memberships expire November 1. The annual membership fee is $20/year. You may download a membership application from the AGS website and return it at a luncheon meeting, or mail it to the address above. Contact membership coordinator Greg Wilson with changes or updates (e-mail: gregory.c.wilson at conocophillips.com; phone: 907-263-4748) All AGS publications are now available for on-line purchase on our website. Check to see the complete catalogue. http://www.alaskageology.org/publications ADVERTISING RATES Advertisements may be purchased at the following rates: 1/10 Page--$190/9mo, $75/1mo; size=1.8 x 3.5 inch 1/4 Page--$375/9mo, $95/1mo; size=4.5 x 3.5 or 2.2 x 7.5 inch 1/3 Page- $470/9mo, $105/1mo; size=7.0 x 3.5 or 3.0 x 7.5 inch 1/2 Page--$655/9mo, $125/1mo; size=9.0 x 3.5 or 4.5 x 7.5 inch Full Page--$1000/9mo, $165/1mo; size=7.5 x 9.0 inch 1mo rate=(9mo rate/9)+$50 (rounded up). Contact Tim Ryherd (907) 269-8771 for advertising information. Membership Notes Annual Dues for Membership in AGS are now $20.00 Membership renewal is Nov. 1st PRA 3601 C Street, Suite 822 Anchorage, AK 99503 (907) 272- 1232, (907) 272- 1344 (fax) [email protected] www.petroak.com Volume 42 Number 6 February 2012 Page 11 2011 - 2012 Alaska Geological Society Board Note: e-mail addresses now contain at instead of @ Please change to @ when typing. President Past-President President-Elect Vice-President Treasurer Secretary Director 10-2012 Director 10-2012 Director 10-2012 Director 11-2013 Director 11-2013 Director 11-2013 Ken Helmold Tom Morahan Steve Wright Dick Garrard Al Hunter Chad Hults Lee Ann Munk Lisa Wright Kirk Sherwood Tom Homza Dave Schoderbek Jim Brown Phone 269-8673 e-mail Ken.helmold at alaska.gov Workplace DNR / DOG 230-1672 263-7865 644-4429 777-8324 786-7417 786-6895 263-4823 334-5337 770-3701 265-6010 Tmorahan at petroak.com Sswr at chevron.com Rgarrard at talismanusa.com whunter at hilcorp.com Chults at usgs.gov aflm at uaa.alaska.edu Lisa.H.Wright at conocophillips.com Kirk.Sherwood at boem.gov Thomas.Homza at shell.com David.A.Schoderbek at ConocoPhillips.com PRA/ConocoPhillips Chevron Talisman Hilcorp USGS UAA ConocoPhillips BOEM Shell ConocoPhillips Alaska Pacific University Committees and Delegates AAPG Delegate AAPG Delegate & Advertising Com. Ed./Science Fair Field Trips Bylaws Memberships Newsletter Editor Publications Scholarship Website Fundraising Arlen Ehm David Hite Tim Ryherd Jana DaSilva Lage Tom Plawman Sue Karl Greg Wilson Greg Wilson Peter Johnson Sue Karl Jan Hazen Sunny Foster 333-8880 258-9059 269-8771 677-7883 227-2781 786-7428 263-4748 263-4748 334-5329 786-7428 269-8707 Arlenehm at gci.net Hitelamb at alaska.net Tim.ryherd at Alaska.gov Jldasilva5 at hotmail.com Tom.plawman at bp.com Skarl at usgs.gov Gregory.c.wilson at conocophillips.com Gregory.c.wilson at conocophillips.com Peter.Johnson at boem.gov Skarl at usgs.gov Jan at homestead-graphics.com Sunny.Remmy at Alaska.gov Geological Consultant Geological Consultant DNR / DOG BOEM BP USGS ConocoPhillips Alaska ConocoPhillips Alaska BOEM USGS Consultant DNR / DOG Alaska Geological Society, Inc. P. O. Box 101288 Anchorage, AK 99510 Redoubt Volcano 2009 Photo: G. Wilson Volume 42 Number 6 February 2012 Page 12