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Alaska Compiled By U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY Geologic Map of Central (Interior) Alaska compiled by Frederic H. Wilson1, James H. Dover1, Dwight C. Bradley1, Florence R. Weber2, Thomas K. Bundtzen3, and Peter J. Haeussler1 1998 Text to accompany U.S. Geological Survey Open-File Report OF 98-133 Prepared in cooperation with the Alaska Department of Natural Resources, Division of Oil and Gas and Division of Geological and Geophysical Surveys U.S. DEPARTMENT OF THE INTERIOR BRUCE BABBITT, Secretary U.S. GEOLOGICAL SURVEY Charles G. Groat, Director This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 1 U.S. Geological Survey, 4200 University Dr., Anchorage AK 99508-4667; 2 U.S. Geological Survey, P.O. Box 80586, Fairbanks, AK 99708-0586; 3 Pacific Rim Geological Consulting, P.O. Box 81906, Fairbanks, AK 99708-1906 Geologic Map of Central (Interior) Alaska Table of Contents Introduction.....................................................................................................................................1 Acknowledgements ..........................................................................................................................2 DESCRIPTION OF MAP UNITS GENERAL UNITS bu Bedrock of unknown type or age ......................................................................................3 QUATERNARY AND LATE TERTIARY ROCKS AND DEPOSITS Qs Surficial deposits, undifferentiated...................................................................................3 Qv Volcanic rocks, undivided.................................................................................................3 QTv Volcanic rocks, undivided.................................................................................................3 QTi Intrusive rocks, undivided ................................................................................................3 TERTIARY ROCKS Sedimentary rocks Tsu Sedimentary rocks, undivided ..........................................................................................3 Tk Kenai Group, undivided....................................................................................................3 Tsf Sterling Formation ................................................................................................4 Tkb Beluga Formation..................................................................................................4 Tty Tyonek Formation .................................................................................................4 Tn Nenana Gravel...................................................................................................................4 Tcb Coal-bearing rocks ............................................................................................................4 Ttw Tsadaka, West Foreland, and Wishbone Formations, undivided ....................................4 Tts Tsadaka Formation ...............................................................................................4 Twf West Foreland Formation......................................................................................4 Tw Wishbone Formation.............................................................................................4 Tvs Volcanic and sedimentary rocks, undivided.....................................................................4 Tfv Fluviatile sedimentary rocks and subordinate volcanic rocks.........................................5 Tch Chickaloon Formation.......................................................................................................5 Tar Arkose Ridge Formation....................................................................................................5 Tovs Orca Group, undivided......................................................................................................5 Tos Sedimentary rocks of the Orca Group..................................................................5 Toc Conglomerate of the Orca Group..........................................................................5 Tov Volcanic rocks of the Orca Group, undivided ......................................................5 Igneous rocks Volcanic and hypabyssal rocks Tvu Volcanic rocks, undivided.................................................................................................5 Trs Rhyolitic volcanic and sedimentary rocks ........................................................................5 Tb Basalt.................................................................................................................................6 Thf Hypabyssal felsic and intermediate intrusive rocks.........................................................6 Thm Hypabyssal mafic intrusive rocks.....................................................................................6 Pliocene Thd Hornblende dacite .............................................................................................................6 Miocene Tba Basaltic andesite ...............................................................................................................6 i Oligocene and Eocene Tvr Crystal and crystal-lithic ash-flow tuff.............................................................................6 Tvb Andesite and basalt...........................................................................................................6 Paleocene Tcv Volcanic rocks of the Cantwell Formation........................................................................7 Plutonic rocks Tiv Granitic and volcanic rocks, undivided............................................................................7 Oligocene Togr Granite...............................................................................................................................7 Oligocene or Eocene Toegr Granitic rocks....................................................................................................................7 Toem Granodiorite to tonalite.....................................................................................................7 Eocene Tegr Granite and granodiorite...................................................................................................7 Td Felsic intrusive rocks ........................................................................................................7 Paleocene Tpgr Granitic rocks....................................................................................................................8 Thgd Granodiorite and other intermediate plutonic rocks........................................................8 Tgl Gabbro...............................................................................................................................8 TERTIARY AND/OR CRETACEOUS Sedimentary rocks TKcg Conglomerate, sandstone, and lignite ..............................................................................8 Igneous rocks Volcanic and hypabyssal rocks TKv Flows, tuff, and breccia, undivided...................................................................................8 TKd Dikes and subvolcanic rocks of intermediate composition..............................................8 TKgp Hypabyssal granite porphyry dikes and rhyolitic sills, and plugs...................................8 TKvr Rhyolite and related rocks ................................................................................................8 TKvi Andesite and related rocks................................................................................................9 TKiv Mafic to intermediate volcano-plutonic complexes ..........................................................9 Intrusive rocks TKi Intrusive rocks, undivided ................................................................................................9 TKg Granitic rocks....................................................................................................................9 TKgd Granodiorite, tonalite, and monzonite dikes, and stocks ................................................9 TKqd Quartz diorite and diorite dikes and stocks .....................................................................9 TKl Lamprophyre, alkali gabbro, and alkali diorite ................................................................9 TKgb Gabbro and leucogabbro...................................................................................................9 TDg Gabbro...............................................................................................................................9 ii Metamorphic rocks TKc Melange or cataclastite of the Orca Group.......................................................................9 TKgg Gneissose granitic rocks ...................................................................................................9 TPza Amphibolite facies metamorphic rocks...........................................................................10 UNDIVIDED MESOZOIC ROCKS Sedimentary rocks KTRg Gemuk Group..................................................................................................................10 Igneous rocks Mzi Intrusive rocks.................................................................................................................10 Mzum Ultramafic and associated rocks.....................................................................................10
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