Geologic map of the Dalton Highway (Atigun Gorge to Slope Mountain) area, southern Arctic Foothills, Alaska

Harris, E.E. Mull, C.G. Reifenstuhl, R.R. Montayne, Simone 2002 Geologic map of the Dalton Highway (Atigun Gorge to Slope Mountain) area, southern Arctic Foothills, Alaska Map and vector digital data Preliminary Investigative Report PIR 2002-2 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS) http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2867 This report provides detailed mapping (1:63,360-scale) in the Dalton Highway area, from Atigun Gorge to Slope Mountain, in the west-central Philip Smith Mountains quadrangle. The map area extends from the northern flank of the Endicott Mountains into the Arctic Foothills province. The geologic map of the of the Dalton Highway area from Atigun Gorge to Slope Mountain is one of a series of geologic maps selected by the Alaska Division of Geological & Geophysical Surveys (DGGS) for detailed mapping (1:63,360-scale) to document important stratigraphic and structural relationships at the Brooks Range mountain front and in the adjacent northern foothills. New detailed geologic mapping of the quadrangle will provide stratigraphic control to document the transition from units in NPRA to units in ANWR and help correlate rocks in these areas to the Prudhoe Bay oilfield. The layers listed below are present as ArcGIS shape files. To enhance print quality, this publication utilized a vector topography dataset. The topography dataset is included with this release but is documented in a separate metadata file named, "PIR2002-2_topo.faq.html." Attribute information for the following layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. Each layer is listed and described in detail under its own heading starting "Entity_Type_Label." Basic unit information is also included in the geologic unit code set file "PIR2002-2_codeset.pdf". Layers include: >bedrock_arc geologic unit contacts >bedrock_poly geologic unit polygons >kc_chrt_point point locations of Buchia limestone coquina and Imnaitchiak Chert boulders >motion_point symbols showing relative motion and/or orientation of structural elements >qal_af_poly polygons indicating location of aufeis >strike_dip_point point locations of bedding and foliation orientation data >structure_arc line symbols depicting the location of traceable beds, faults, and axial traces of folds 1984 2002 June 2002 (publication date) Complete none planned -150.000000 -149.000000 68.779444 68.439167 ISO 19115 Topic Category geoscientificInformation none Allochthon Alluvial Arenite Aufeis Barite Biostratigraphy Carbonates Chert Clastics Coal Colluvial Deposits Conglomerate Correlation Depositional Environment Eolian Fan Faulting Fluvial Folding Geologic Map Glacial Glacial Lake Glaciation Grainstone Graywacke Ice-Contact Igneous Kettles Lacustrine Landslide Limestone Measured Stratigraphic Section Mudstone Organic Geochemistry Orogeny Outwash Packstone Paleocurrent Paleontology Petroleum Porosity Provenance Reservoir Rock-Glacier Sandstone Shale Siderite Solifluction STATEMAP Program Stratigraphy Structure Surficial Tectonics Terrace Turbidites Uplift Wackestone none Alaska, State of Atigun Gorge Atigun River Brooks Range Dalton Highway Endicott Mountains Galbraith Lake Imnavait Mountain Itigaknit Mountain Itkillik River Kuparuk River Philip Smith Mountains Quadrangle Sagavanirktok River Slope Mountain Toolik Lake Toolik River Trans-Alaska Pipeline none Blankenship Member Buchia Limestone Coquina Cobblestone Member Cobblestone Parautochthonous Sequence Endicott Mountain Allochthon Fortress Mountain Formation Imnaitchiak Chert Ipnavik River Allochthon Itkillik Glaciation Kanayut Conglomerate Kayak Shale Lisburne Group Nanushuk Formation Okpikruak Formation Otuk Formation Picnic Creek Allochthon Sagavanirktok Glaciation Siksikpuk Formation Stuver Member Torok Formation Unnamed Phosphatic-Manganiferous Shale none Albian Aptian Barremian Cenomanian Cretaceous Devonian Holocene Jurassic Mississippian Pennsylvanian Permian Pleistocene Quaternary Triassic Valanginian This map and data set is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below). Any hard copies or published data sets utilizing these data sets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these data sets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys GIS Data Manager/Cartographer mailing and physical address

3354 College Road

Fairbanks AK 99709-3707 USA (907) 451-5029 (907) 451-5020 (907) 451-5050 dggspubs@alaska.gov You may view our web site at http://www.dggs.dnr.state.ak.us for the latest information on available data. Please e-mail your questions and data requests when possible since our web site and e-mail address will remain current even if our phone number and mailing address change. Funding for the geologic mapping and geochronologic dating performed for this project was provided by the U.S. Geological Survey STATEMAP Program under award number 03HQAG0055 and by the Alaska State Legislature. Geologic field investigations by: C.G. Mull1 (1984-1987, 1989-1994 1999-2001); E.E. Harris (1984-1985, 1992, 1999-2001); R.R Reifenstuhl1 (1991-1992, 1994, 2000-2001); R.K. Glenn (1989); K.E. Adams (1984-1985); D.A. Bodnar (1983); J.P. Siok (1983); D.L. LePain (2001); M.A. Wartes (2001); T.J. Ryherd (1989, 1992, 2001); R.K. Crowder (1984); Paige R. Peapples (2001); R.A. Kirkham (1999-2001); Simone Montayne (2001); M.B. Mickey5 (2000); and M.T. Whalen (2001); R.B. Blodgett(2001); Art Banet (2000); Landon Kelly (2001). Technical review by: J.G. Clough. Digital cartography by: Simone Montayne. Edited by: Paula K. Davis Microsoft Windows XP SP2, ArcGIS 9.+, and any text editor. Hamilton, T.D. 2002 Surficial geology of the Dalton Highway (Itkillik-Sagavanirktok Rivers) area, southern Arctic Foothills, Alaska map and text report Professional Report PR 121 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys text report, 40 p., 1 sheet, scale 1:63,360 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=7191 Geologic data used in the compilation was derived from the field maps and notes generated by this project (2001 and 2002) as well as data from other sources as noted in the "Source_Information" section. Location data for geologic point coverages was acquired from hand held GPS units and compiled on paper field maps and notebooks. A mylar compilation map composed of all geologic information elements was scanned and digitized "on screen" using ArcGIS 8.1. Spatial data attributes were attached to data objects using ArcGIS 8.1. Attributes were verified for consistency and completeness during the creation of the metadata. Topology is present on appropriate polygon and line data tables; others are point data tables. This dataset includes vector data tables that contain information about geologic units, structural features, and structural measurements. DGGS location data and estimated position errors were acquired with hand held GPS units and transferred to field maps and notebooks. Sample numbers and locations of selected data were transferred to a mylar compilation map. The compilation map was scanned and point locations were digitized "on screen" and spatially registered in ArcGIS 8.1. See "Source_Information" section for horizontal positional accuracy of locations not measured by DGGS. 10 A value of estimated position error in meters was calculated by hand held GPS units and recorded for each sample location. Estimated position error calculated by the GPS units was not less than 3 meters and averaged approximately 6 meters. The GPS system suffers from calculation and geometric error. This error results from items such as error in satellite positions, mathematical error introduced by the formulas used by the GPS unit for calculating position, and errors caused by narrow satellite alignments. Estimated position error is a value determined by the GPS manufacturer for the calculation and geometric error as a whole. "Selective availability," a deliberate degradation of GPS data managed by the U.S. government that induces an additional error of approximately 100 meters to a GPS location, was not in effect during DGGS's 2001 field work. The geologic map data have a horizontal positional accuracy dependent on the "on-screen" method of digital cartography. Map error is induced by: (1) transferring map data from base topography to a mylar compilation map, with an estimated potential error due to a pen line width of approximately 0.001 being equivalent to approximately 1.5 meters on the ground; (2) the digitizing RMS error; and (3) the accuracy of the human operator digitizing the geologic linework from the mylar compilation maps with an estimated error due to a pen line width of approximately 0.001 being equivalent to approximately 1.5 meters on the ground. Total potential horizontal error for map features is estimated to be approximately 10 meters. W.P. Brosgé Reiser, H.N. Dutro Jr., J.T. Detterman, R.L. 1979 Bedrock geologic map of the Philip Smith Mountains quadrangle, Alaska Miscellaneous Field Studies Map MF 879-B Reston, VA, USA U.S. Geological Survey 2 sheets 250000 map 1979 publication date Brosgé and others, 1979 This regional scale map contains geologic unit descriptions and outcrop locations and was used to plan traverses and help define geologic units. Glenn, R.K. unpublished material Range-front structure and lithostratigraphy of the Atigun Gorge area, north-central Brooks Range, Alaska, Unpublished Master's Thesis Unpublished Master's Thesis: University of Alaska Fairbanks, 86 pages, 2 sheets 24847 report, figures 1991 ground condition Glenn, 1991 This report contains geologic unit descriptions and was used to help plan traverses in the map area. Hamilton, T.D. 2003 Surficial geology of the Dalton Highway (Itkillik-Sagavanirktok Rivers) area, southern Arctic Foothills, Alaska Professional Report PR 121 Fairbanks, AK, USA Alaska Division of Geological & Geophysical Surveys 32 pages, 1 sheet http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=7191 63360 report, map 2002 ground condition Hamilton, 2003 This map was the primary source for distribution and description of the surficial units for this map. Mull, C.G. Harris, E.E. Peapples, Paige unpublished material Geology of the Cobblestone Creek-May Creek area, central Brooks Range foothills, Alaska Report of Investigation in press 20 pages, 1 sheet none 63360 report, map 2002 publication date Mull and others, 2002 This report and map contains structural and descriptions of geologic units that extend westward of the map area. Mull, C.G. Houseknecht, D.W. Bird, K.J. 2003 Revised Cretaceous and Tertiary stratigraphic nomenclature in the east-central Colville basin, northern Alaska Professional Paper 1673 Reston, VA USA U.S. Geological Survey 51 pages report 2003 publication date Mull and others, 2003 This report defines nomenclature used for Cretaceous and Tertiary rocks in this map area. Mull, C.G. Moore, T.E. Harris, E.E. Tailleur, I.L. 1994 Geologic map of the Killik River quadrangle, Brooks Range, Alaska Open File Report OF 94-679 Washington, DC, USA U.S. Geological Survey 1 sheet 125000 map 1994 publication date Mull and others, 1994 This map contains bedrock unit descriptions, in particular of the Ipnavik and Picnic Creek allochthons, that helped with the interpretation on units in this map area. Reifenstuhl, R.R. Mull, C.G. Pessel, G.H. Myers, M.D. 1993 Preliminary bedrock geologic map of the Philip Smith Mountains C-4 Quadrangle, northeastern Brooks Range, Alaska Public Data File PDF 93-30C Fairbanks, AK, USA Alaska Division of Geological & Geophysical Surveys 11 p., 1 sheet http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=1566 63360 report, map 1993 publication date Reifenstuhl and others, 1993 This map overlaps in part with this work and directly contributed to some of the map units. USGS 1971 Philip Smith Mountains (B-4), Alaska Reston, VA, USA U.S. Geological Survey 1 sheet 63360 map 1971 ground condition USGS, Philip Smith Mountains (B-4) Topographic base-map USGS 1971 Philip Smith Mountains (C-4), Alaska Reston, VA, USA U. S. Geological Survey 1 sheet 63360 map 1971 ground condition USGS, Philip Smith Mountains (C-4) Topographic base-map USGS 1971 Philip Smith Mountains (D-4), Alaska Reston, VA, USA U.S. Geological Survey 1 sheet 63360 map 1971 ground condition USGS, Philip Smith Mountains (D-4) Topographic base-map USGS 1971 Philip Smith Mountains (B-5), Alaska Reston, VA, USA U.S. Geological Survey 1 sheet 63360 map 1971 ground condition USGS, Philip Smith Mountains (B-5) Topographic base-map USGS 1971 Philip Smith Mountains (C-5), Alaska Reston, VA, USA U.S. Geological Survey 1 sheet 63360 map 1971 ground condition USGS, Philip Smith Mountains (C-5) Topographic base-map USGS 1971 Philip Smith Mountains (D-5), Alaska Reston, VA, USA U.S. Geological Survey 1 sheet 63360 map 1971 ground condition USGS, Philip Smith Mountains (D-5) Topographic base-map Adams, K.E. unpublished material Permian sedimentation in the north-central Brooks Range, Alaska: Implications for tectonic reconstructions Unpublished Master's Thesis: University of Alaska Fairbanks, 11 pages, 1 sheet report 1991 ground condition Adams, 1991 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Adams, K.E. Mull, C.G. Crowder, R.K. 19970910 Permian deposition in the north central Brooks Range, Alaska: Constraints for tectonic reconstructions Journal of Geophysical Research v. 102, n. B9 Washington, D.C, USA American Geophysical Union p. 20727-20748 report 1997 publication date Adams and others, 1997 This report contributed to the structural interpretation of this map. Ahlbrandt, T.S. Huffman Jr., A.C. Fox, J.E. Pasternack, Ira 1979 Depositional framework and reservoir quality studies of selected Nanushuk Group outcrops, North Slope, Alaska Ahlbrandt, T.S. (ed.) 1979 Preliminary geologic, petrologic, and paleontologic results of the study of Nanushuk Group rocks, North Slope, Alaska Circular 794 Reston, VA, USA U.S. Geological Survey p. 14-31 report 1979 publication date Ahlbrandt and others, 1979 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Susan Bartsch-Winkler 1985 Petrography of sandstones of the Nanushuk Group from four measured sections, central Brooks Range, Alaska Huffman Jr., A.C. (ed.) 1985 Geology of the Nanushuk Group and related rocks, North Slope, Alaska Bulletin 1614 Reston, VA, USA U.S. Geological Survey pages 75-95 report 1985 publication date Bartsch-Winkler, 1985 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Bird, K.J. Molenaar, K.M. 1992 The North Slope Foreland Basin, Alaska Macqueen, R.W. (ed.) Leckie, D.A. (ed.) 1992 Foreland Basins and Fold Belts American Association of Petroleum Geologists Memoir 55 p. 363-393 report 1992 publication date Bird and Molenaar, 1992 This report contributed to the understanding the depositional system of the foreland and Colville basin. Bodnar, D.A. 1989 Stratigraphy of the Otuk Formation and a Cretaceous coquinoid and shale unit, north-central Brooks Range Mull, C.G. (ed.) Adams, K.E. (ed.) 1989 Bedrock geology of the eastern Koyukuk Basin, central Brooks Range, and eastcentral Arctic Slope along the Dalton Highway, Yukon River to Prudhoe Bay, Alaska Guide Book GB 7 v. 2 p. 277-284 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2875 report 1989 publication date Bodnar, 1989 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Bodnar, D.A. unpublished material Stratigraphy, age, depositional environments, and hydrocarbon source rock evaluation of the Otuk Formation, north-central Brooks Range, Alaska Unpublished Master's Thesis: University of Alaska Fairbanks, 232 pages report 1984 ground condition Bodnar, 1984 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Brosgé, W.P. Moore, T.H. 1988 Geology of the Upper Devonian and Lower Mississippian(?) Kanayut Conglomerate in the central and eastern Brooks Range, Alaska Gryc, George (ed.) 1988 Geology and exploration of the National Petroleum Reserve in Alaska Professional Paper 1399 p. 299-316 report 1988 publication date Brosgé and Moore, 1993 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Cole, Frances Bird, K.J. Toro, J. Roure, F. O'Sullivan, P.B. Pawlewicz, M. Howell, D.G. 1997 An integrated model for the tectonic development of the frontal Brooks Range and Colville basin 250 km west of the Trans-Alaska Crustal Transect Journal of Geophysical Research v. 102, n.B9 Washington, D.C., USA American Geophysical Union p. 20685-20708 report 1997 publication date Cole and others, 1997 This report contributed to the structural interpretation this map. Crowder, R.K. 1987 Cretaceous basin to shelf transition in northern Alaska: deposition of the Fortress Mountain Formation Tailleur, I.L. (ed.) Weimer, Paul (ed.) 1987 Alaskan North Slope Geology Society of Economic Paleontologists and Mineralogists, Pacific Section, and Alaska Geological Society v. 1 p. 449-458 report 1987 publication date Crowder, 1993 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Crowder, R.K. 1989 Deposition of the Fortress Mountain Formation Mull, C.G. (ed.) Adams, K.E. (ed.) 1989 Dalton Highway, Yukon River to Prudhoe Bay, Alaska: Bedrock Geology of the eastern Koyukuk basin, central Brooks Range, and east-central Arctic Slope: Alaska Guide Book GB 7 v. 2 p. 293-301 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2875 report 1989 publication date Crowder, 1989 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Detterman, R.L. 1956 New and refined nomenclature of Nanushuk Group American Association of Petroleum Geologists Bulletin v. 40, n. 2 p. 233-244 report 1956 publication date Detterman, 1956 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Dumoulin, J.A. Watts, K.F. Harris, A.G. 1997 Stratigraphic contrasts and tectonic relationships between Carboniferous successions in the Trans-Alaska Crustal Transect corridor and adjacent areas, northern Alaska Journal of Geophysical Research v. 102, n. B9 Washington, D.C., USA American Geophysical Union p. 20709-20726 report 1997 publication date Dumoulin and others, 1997 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Gryc, George Patton Jr., W.W. Payne, T.G. 1951 Present Cretaceous stratigraphic nomenclature of northern Alaska Journal of Washington Academy of Sciences v. 41 p. 159-167 report 1951 publication date Gryc and others, 1951 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Huffman Jr., A.C. Ahlbrandt, T.S. Pasternack, Ira Strickler, G.D. Fox, J.E. 1985 Depositional and sedimentologic factors affecting the reservoir potential of the Cretaceous Nanushuk Group, central North Slope, Alaska Huffman Jr., A.C. (ed.) 1985 Geology of the Nanushuk Group and related rocks, North Slope, Alaska Bulletin 1614 Reston, VA, USA U.S. Geological Survey p. 61-74 report 1985 publication date Huffman and others, 1985 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. LePain, D.L. Kirkham, R. McCarthy, P.J. 2002 Shoreline to basin transition (?) in Albian-Cenomanian strata east of the Sagavanirktok River, Brooks Range Foothills, Alaska, Northern Alaska: Energy Frontiers - A 2002 Perspective Program and Abstracts, American Association of Petroleum Geologists and Society of Petroleum Engineers none 87 pp. report 2002 publication date LePain and others, 2002 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Molenaar, C.M. 1985 Subsurface correlations and depositional history of the Nanushuk Group and related strata, North Slope, Alaska Huffman Jr., A.C. (ed.) 1985 Geology of the Nanushuk Group and related rocks, North Slope, Alaska Bulletin 1614 Reston, VA, USA U.S. Geological Survey p. 37-59 report 1985 publication date Molenaar, 1985 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Molenaar, C.M. Egbert, R.M. Krystinik, L.F. 1981 Depositional facies, petrography, and reservoir potential of the Fortress Mountain Formation (Lower Cretaceous), central North Slope, Alaska Open File Report 81-967 Reston, VA, USA U.S. Geological Survey 32 pp. report 1981 publication date Molenaar and others, 1981 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Moore, T.E. Nilsen, T.H. Brosgé, W.P. 1989 Sedimentology of the Kanayut Conglomerate Mull, C.G. (ed.) Adams, K.E. (ed.) 1989 Dalton Highway, Yukon River to Prudhoe Bay, Alaska: Bedrock Geology of the eastern Koyukuk basin, central Brooks Range, and east-central Arctic Slope: Alaska Guide Book GB 7 v. 2 p. 219-252 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2875 report 1989 publication date Moore and others, 1989 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Moore, T.E. Wallace, W.K. Mull, C.G. Adams, K.E. Plafker, George Nokleberg, W.J. 1997 Crustal implications of bedrock geology along the Trans-Alaska Crustal Transect (TACT) in the Brooks Range, northern Alaska Journal of Geophysical Research v. 102, n. B9 Washington, D.C., USA American Geophysical Union p. 20645-20684 report 1997 publication date Moore and others, 1997 This report contributed to the structural interpretation of this map. Moore, T.E. Wallace, W.K. Bird, K.J. Karl, S.M. Mull, C.G. Dillon, J.T. 1994 Geology of Northern Alaska Plafker, George (ed.) H.C. Berg ed. 1994 The Geology of Alaska: The Geology of North America Geological Society of America v. G-1 p. 49-140 report 1994 publication date Moore and others, 1994 This report contributed to understanding the regional framework of the map area. Mull, C.G. 1985 Cretaceous tectonics, depositional cycles, and the Nanushuk Group, Brooks Range and the Arctic Slope, Alaska Huffman Jr., A.C. (ed.) 1985 Geology of the Nanushuk Group and related rocks, North Slope, Alaska Bulletin 1614 Reston, VA, USA U.S. Geological Survey pages 7-36 report 1985 publication date Mull, 1985 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area Mull, C.G. 1989 Generalized stratigraphy and structure of the Brooks Range and Arctic Slope Mull, C.G. (ed.) Adams, K.E. (ed.) 1989 Dalton Highway, Yukon River to Prudhoe Bay, Alaska: Bedrock Geology of the eastern Koyukuk basin, central Brooks Range, and east-central Arctic Slope: Alaska Guide Book GB 7 v. 2 pages 31-46 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2875 report 1989 publication date Mull, 1989 This report contributed to the regional understanding of the map area. Mull, C.G. Crowder, R.K. Adams, K.E. Siok, J.P. Bodnar, D.A. Harris, E.E. Alexander, R.A. Solie, D.N. 1987 Stratigraphy and structural setting of the Picnic Creek allochthon, Killik River quadrangle, central Brooks Range, Alaska: A summary Tailleur, I.L. (ed.) Weimer, Paul (ed.) 1987 Alaskan North Slope Geology Society of Economic Paleontologists and Mineralogists, Pacific Section, and Alaska Geological Society v. 2 p. 649-662 report 1987 publication date Mull and others, 1987 This report contributed to the regional, structural, and sedimentological descriptions of the map area. Mull, C.G. Glenn, R.K. Adams, K.E. 1997 Tectonic evolution of the central Brooks Range mountain front: Evidence from the Atigun Gorge region Journal of Geophysical Research v. 102, n. B-9 Washington, D.C., USA American Geophysical Union p. 20749-20772 report 1997 publication date Mull and others, 1997 This report contributed to the structural interpretation of this map. Mull, C.G. Harris, E.E. 1989 Road log from Chandalar Shelf (Mile 237.1) to Prudhoe Bay (Mile 414) Mull, C.G. (ed.) Adams, K.E. (ed.) 1989 Dalton Highway, Yukon River to Prudhoe Bay, Alaska: Bedrock Geology of the eastern Koyukuk basin, central Brooks Range, and east-central Arctic Slope: Alaska Guide Book GB 7 v. 2 p. 101-132 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2875 report 1989 publication date Mull and Harris, 1989 This map contributed to the regional understanding of the map area. Nilsen, T.H. Moore, T.E. 1984 Stratigraphic nomenclature for the Upper Devonian and Lower Mississippian(?) Kanayut Conglomerate, Brooks Range, Alaska Bulletin 1529-A Reston, VA, USA U.S. Geological Survey 64 pp. report 1984 publication date Nilsen and Moore, 1984 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Sable, E.G. 1956 New and refined Cretaceous formations in western part of northern Alaska American Association of Petroleum Geologists v. 40, n. 11 p. 2635-2643 report 1956 publication date Sable, 1956 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Schenk, C.J. Bird, K.J. 1993 Depositional sequences in lower Cretaceous rocks, Atigun Syncline and Slope Mountain areas, Alaskan North Slope Dusel-Bacon, Cynthia (ed.) Till, A.B. (ed.) 1993 Geologic studies in Alaska by the U.S. Geological Survey, 1992 Bulletin 2068 pages 48-58 report 1993 publication date Schenk and Bird, 1993 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Siok, J.P. 1989 Stratigraphy and petrology of the Okpikruak Formation at Cobblestone Creek, northcentral Brooks Range Mull, C.G. (ed.) Adams, K.E. (ed.) 1989 Dalton Highway, Yukon River to Prudhoe Bay, Alaska: Bedrock Geology of the eastern Koyukuk basin, central Brooks Range, and east-central Arctic Slope: Alaska Guide Book GB 7 v. 2 pages 285-292 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2875 report 1989 publication date Siok, 1989 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Siok, J.P. 1985 Geologic history of the Siksikpuk Formation on the Endicott Mountains and Picnic Creek allochthons, north-central Brooks Range, Alaska Unpublished Master's Thesis, University of Alaska Fairbanks, 253 pages report 1985 publication date Siok, 1985 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area Wallace, W.K. Moore, T.E. Plafker, George 1997 Multistory duplexes with forward dipping roofs, north central Brooks Range, Alaska Journal of Geophysical Research v. 102, n. B-9 Washington, D.C., USA American Geophysical Union p. 20773-20796 report 1997 publication date Wallace and others, 1997 This report contributed to the structural interpretation of this map. Wartes, M.A. Carroll, A.R. 2002 Detailed facies analysis of the Lower Cretaceous Fortress Mountain Formation, Atigun Syncline, Northern Alaska: Energy Frontiers - A 2002 Perspective Program and Abstracts, American Association of Petroleum Geologists and Society of Petroleum Engineers none p. 107 report 2002 publication date Wartes and Carroll, 2002 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Wilber, S.C. Siok, J.P. Mull, C.G. 1987 A comparison of two petrographic suites of the Okpikruak Formation: a point count analysis Tailleur, I.L. (ed.) Weimer, Paul (ed.) 1987 Alaskan North Slope Geology Society of Economic Paleontologists and Mineralogists, Pacific Section, and Alaska Geological Society v. 1 p. 441-447 report 1987 publication date Wilber and others, 1987 This report contributed to understanding sedimentation and stratigraphy, to map and define units, in the map area. Field work - During the summer of 2001 DGGS conducted a geologic field mapping project. Field work for bedrock and surficial investigations was conducted for approximately 30 days during the months of June and July 2001. Field notes and rock samples were collected at approximately 1,100 stations throughout the map area. Geologists recorded observations on 1:63,360-scale topographic base maps and/or similarly scaled aerial photographs. In the evenings, each geologist's observations were compiled onto a single mylar base map. Field stations were located using handheld GPS units. Brosgé and others, 1979 Glenn, 1991 Mull and others, 2002 Mull and others, 2003 Mull and others, 1994 Reifenstuhl and others, 1993 Philip Smith Mountains (B-4), Alaska Philip Smith Mountains (C-4), Alaska Philip Smith Mountains (D-4), Alaska Philip Smith Mountains (B-5), Alaska Philip Smith Mountains (C-5), Alaska Philip Smith Mountains (D-5), Alaska 2001 Data Compilation - Geologic information from relevant literature was incorporated into the data generated from field work. Final interpretations were recorded on a mylar sheet. Brosgé and others, 1979 Mull and others, 2002 Mull and others, 2003 Mull and others, 1994 Reifenstuhl and others, 1993 Adams, 1991 Adams and others, 1997 Ahlbrandt and others, 1979 Bartsch-Winkler, 1985 Bird and Molenaar, 1992 Bodnar, 1989 Bodnar, 1984 Brosgé and Moore, 1993 Cole and others, 1997 Crowder, 1993 Crowder, 1989 Detterman, 1956 Dumoulin and others, 1997 Gryc and others, 1951 Huffman and others, 1985 LePain and others, 2002 Molenaar, 1985 Molenaar and others, 1981 Moore and others, 1989 Moore and others, 1997 Moore and others, 1994 Mull, 1985 Mull, 1989 Mull and others, 1987 Mull and others, 1997 Mull and Harris, 1989 Nilsen and Moore, 1984 Sable, 1956 Schenk and Bird, 1993 Siok, 1989 Siok, 1985 Wallace and others, 1997 Wartes and Carroll, 2002 Wilber and others, 1987 2001-2002 Digital Cartography - The final compilation of the geologic map data on mylar was scanned as a high-resolution tiff file. The file was imported into ArcGIS 8.1, and geographically registered in UTM coordinates (see spatial reference information section below). Geologic polygons, linear features, and data point locations were digitized 'on-screen' and attributed with appropriate supporting information. Editing and quality control checks took place at every process step. All final map layout and editing was accomplished in Adobe Illustrator Version 9. Hamilton, 2002 2002 Universal Transverse Mercator 6 0.999600 147.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000064 0.000064 meters bedrock_arc Universal Transverse Mercator 6 0.999600 147.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000064 0.000064 meters bedrock_poly Universal Transverse Mercator 6 0.999600 147.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000032 0.000032 meters kc_chrt_point Universal Transverse Mercator 6 0.999600 147.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000064 0.000064 meters motion_point Universal Transverse Mercator 6 0.999600 147.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000064 0.000064 meters qal_af_poly Universal Transverse Mercator 6 0.999600 147.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000064 0.000064 meters strike_dip_point North American Datum of 1927 Clarke 1866 6,378,206.4 294.98 bedrock_arc.shp Object type is vector, there are 2,023 rows associated with this entity, and the entity values refer to geologic unit contacts. Alaska Division of Geological & Geophysical Surveys bedrock_arc SYMBOL Geologic contact classification Alaska Division of Geological & Geophysical Surveys 0 geologic unit contact location certain Alaska Division of Geological & Geophysical Surveys 5 geologic unit contact location certain Alaska Division of Geological & Geophysical Surveys 1 geologic unit contact location approximate Alaska Division of Geological & Geophysical Surveys 2 geologic unit contact location concealed Alaska Division of Geological & Geophysical Surveys bedrock_poly.shp Object type is vector, there are 494 rows associated with this entity, and the entity values refer to bedrock and surficial geologic polygons Alaska Division of Geological & Geophysical Surveys bedrock_poly UNIT bedrock and surficial unit labels Alaska Division of Geological & Geophysical Surveys PIR2002-2_codeset.pdf Alaska Division of Geological & Geophysical Surveys http://www.dggs.dnr.state.ak.us/metadata/PIR2002-2_codeset.pdf kc_chrt_point.shp Object type is point, there are 24 rows associated with this entity, and the entity values refer to locations of Imnaitchiak Chert boulders or Buchia limestone coquina. Alaska Division of Geological & Geophysical Surveys kc_chrt_point SYMBOL Designates either Imnaitchiak Chert boulders or Buchia limestone coquina Alaska Division of Geological & Geophysical Surveys JlPi Imnaitchiak Chert boulders Alaska Division of Geological & Geophysical Surveys Kc Buchia limestone coquina Alaska Division of Geological & Geophysical Surveys motion_point.shp Object type is point, there are 63 rows associated with this entity, and the entity values refer to label points of map symbols that indicate relative motion and/or orientation of structural elements. Alaska Division of Geological & Geophysical Surveys motion_point SYMBOL type of map symbol Alaska Division of Geological & Geophysical Surveys 0 anticline symbol Alaska Division of Geological & Geophysical Surveys 1 plunge symbol Alaska Division of Geological & Geophysical Surveys 2 strike slip fault Alaska Division of Geological & Geophysical Surveys 3 marks where the fault trace can no longer be mapped Alaska Division of Geological & Geophysical Surveys 4 syncline symbol Alaska Division of Geological & Geophysical Surveys 5 Location of a numeric symbol indicating angle of plunge measured or estimated downward from horizontal Alaska Division of Geological & Geophysical Surveys 6 overturned fault symbol Alaska Division of Geological & Geophysical Surveys 7 overturned anticline symbol Alaska Division of Geological & Geophysical Surveys 8 symbol indicating that the northern side of a fault is down-thrown Alaska Division of Geological & Geophysical Surveys 9 symbol indicating that the southwestern side of a fault is down-thrown Alaska Division of Geological & Geophysical Surveys ANGLE This field contains the rotation angle data that corresponds with each symbol class contained in the "SYMBOL" field of this table. Proper orientation of depicted map symbols varies according to its "SYMBOL" field value. Label points with "SYMBOL" field values of "0, 2, 4, 7, 8, or 9" are rotated such that when the long axis of the standard geologic map symbol for this entity is vertical, with single sided arrows (if applicable) pointing due South, the "ANGLE" field value is "180". Label points with a "SYMBOL" field value of "1" would yield an "ANGLE" field value of "270" when depicting an arrow pointed due South. Label points with a "SYMBOL" field value of "3" would appear upright and vertical when depicted as a "?". Label points with a "SYMBOL" field value of "5" are label placeholders for numeric values listed in the "LABEL" field of this table and do not require any particular orientation. Label points with a "SYMBOL" field value of "6" would yield an "ANGLE" field value of "90" when depicting an arrow pointed due South. Alaska Division of Geological & Geophysical Surveys 0 360 degrees LABEL Numeric symbol indicating angle of plunge measured or estimated downward from horizontal. A null value in this field indicates that either these data were not obtained or this measurement is not applicable to the "SYMBOL" type displayed at that particular label point. Alaska Division of Geological & Geophysical Surveys and others (see reference attribute information) 0 90 degrees qal_af_poly.shp Object type is vector, there are 2 rows associated with this entity, and the entity values refer to location and extent of aufeis. Alaska Division of Geological & Geophysical Surveys qal_af_poly strike_dip_point.shp Object type is point, there are 268 rows associated with this entity. Entity values refer to bedding and foliation orientation data Alaska Division of Geological & Geophysical Surveys strike_dip_point TYPE Indicates class of measurement and/or type of geologic feature. Alaska Division of Geological & Geophysical Surveys and others (see reference attribute information) 0 bedding plane strike and dip Alaska Division of Geological & Geophysical Surveys 2 approximated bedding plane strike and dip Alaska Division of Geological & Geophysical Surveys 3 cleavage strike and dip Alaska Division of Geological & Geophysical Surveys 4 bedding plane strike and dip lineation plunge measurement Alaska Division of Geological & Geophysical Surveys 5 strike and dip of overturned beds Alaska Division of Geological & Geophysical Surveys 6 strike and dip of bed overturned 240 degrees Alaska Division of Geological & Geophysical Surveys 7 vertical beds Alaska Division of Geological & Geophysical Surveys 8 overturned thrust fault Alaska Division of Geological & Geophysical Surveys 9 multiple minor folds showing trace of axial plane and direction of plunge Alaska Division of Geological & Geophysical Surveys DIP Degrees that a plane is inclined relative to horizontal as measured 90 degrees clockwise from strike; horizontal being 0 degrees and vertical being 90 degrees. Alaska Division of Geological & Geophysical Surveys 0 90 degrees unique number "999" that indicates a null value for this field PLUNGE Numeric symbol indicating angle of plunge measured or estimated downward from horizontal. A null value in this field indicates that either these data were not obtained or this measurement is not applicable to the "TYPE" category that is displayed at that particular label point. Alaska Division of Geological & Geophysical Surveys 0 90 degrees ANGLE This field contains the rotation angle data that corresponds with each symbol class contained in the "TYPE" field of this table. Proper orientation of depicted map symbols varies according to its "TYPE" field value. For "TYPE" field values of "0, 2, 3, or 4" the "ANGLE" field value corresponds to standard Azimuth compass values measured using the "right hand rule." For "TYPE" field values of "5, 6, 7, or 8" the "ANGLE" field value corresponds to a numeric value that is rotated ninety degrees clockwise from the standard Azimuth compass values measured using the "right hand rule." For example, an "ANGLE" field value of "0" would indicate a bedding plane oriented East-West. For a "TYPE" field value of "9" the "ANGLE" field value corresponds to a numeric value that is rotated ninety degrees counter clockwise from the standard Azimuth compass values measured using the "right hand rule." For example, an "ANGLE" field value of "0" would indicate a bedding plane oriented East-West with arrows pointing to the West. Alaska Division of Geological & Geophysical Surveys 0 360 degrees structure_arc.shp Object type is vector, there are 429 rows associated with this entity, and the entity values refer to faults, traceable beds, and axial traces of folds. Alaska Division of Geological & Geophysical Surveys structure_arc TYPE structural feature type Alaska Division of Geological & Geophysical Surveys and others (see reference attribute information) 0 traceable bed Alaska Division of Geological & Geophysical Surveys 2 fold axis Alaska Division of Geological & Geophysical Surveys 3 fault, inferred Alaska Division of Geological & Geophysical Surveys 4 concealed fault, location uncertain Alaska Division of Geological & Geophysical Surveys 5 inferred fault, location uncertain Alaska Division of Geological & Geophysical Surveys 6 thrust fault, user will need to see paper publication for interpretation of relative plate motion Alaska Division of Geological & Geophysical Surveys 7 inferred thrust fault, user will need to see paper publication for interpretation of relative plate motion Alaska Division of Geological & Geophysical Surveys 8 inferred major thrust fault bounding structural provinces, user will need to see paper publication for interpretation of relative plate motion Alaska Division of Geological & Geophysical Surveys 9 fold, approximately located Alaska Division of Geological & Geophysical Surveys 10 fault, concealed Alaska Division of Geological & Geophysical Surveys 11 fault, certain Alaska Division of Geological & Geophysical Surveys 12 inferred thrust fault, location uncertain, user will need to see paper publication for interpretation of relative plate motion Alaska Division of Geological & Geophysical Surveys 13 major fault bounding structural provinces, concealed Alaska Division of Geological & Geophysical Surveys 14 major fault bounding structural provinces Alaska Division of Geological & Geophysical Surveys State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Natural Resource Technician mailing and physical

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