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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Alexander Terrane (1)
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Arctic Ocean
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Amerasia Basin (1)
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Arctic region
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Arctic Coastal Plain (1)
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Russian Arctic
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Novaya Zemlya (1)
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Asia
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Chukotka Russian Federation
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Chukchi Peninsula (1)
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Kolyma Uplift (1)
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Krasnoyarsk Russian Federation
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Taymyr Dolgan-Nenets Russian Federation
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Taymyr Peninsula (1)
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Yakutia Russian Federation
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Verkhoyansk Range (1)
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Canada
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Western Canada
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Alberta (1)
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British Columbia (2)
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-
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Colville River (1)
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Commonwealth of Independent States
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Russian Federation
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Arkhangelsk Russian Federation
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Novaya Zemlya (1)
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Chukotka Russian Federation
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Chukchi Peninsula (1)
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Kolyma Uplift (1)
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Krasnoyarsk Russian Federation
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Taymyr Dolgan-Nenets Russian Federation
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Taymyr Peninsula (1)
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Russian Arctic
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Novaya Zemlya (1)
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Yakutia Russian Federation
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Verkhoyansk Range (1)
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Urals
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Novaya Zemlya (1)
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Cook Inlet (3)
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Copper River basin (1)
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Europe
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Arkhangelsk Russian Federation
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Novaya Zemlya (1)
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North America
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Denali Fault (1)
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Yakutat Terrane (1)
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Yukon-Tanana Upland (1)
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North Slope (2)
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Pacific Ocean
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East Pacific
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Northeast Pacific
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Gulf of Alaska (1)
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North Pacific
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Bering Sea (1)
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Northeast Pacific
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Gulf of Alaska (1)
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Pacific region (1)
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Peace River (1)
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Red Dog Mine (1)
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South America
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Bolivia (1)
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United States
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Alaska
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Alaska Peninsula (2)
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Alaska Range (2)
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Aleutian Islands (1)
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Aniakchak (1)
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Brooks Range
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Endicott Mountains (1)
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Denali National Park (1)
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Matanuska Glacier (1)
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Matanuska Valley (1)
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Nixon Fork Terrane (1)
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Susitna River (1)
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commodities
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barite deposits (1)
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metal ores
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lead ores (1)
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polymetallic ores (1)
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silver ores (1)
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zinc ores (2)
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mineral deposits, genesis (2)
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mineral exploration (1)
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petroleum
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natural gas (5)
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elements, isotopes
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carbon
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C-13/C-12 (1)
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C-14 (1)
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isotope ratios (1)
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isotopes
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radioactive isotopes
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Al-26 (1)
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Be-10 (1)
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C-14 (1)
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stable isotopes
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C-13/C-12 (1)
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O-18/O-16 (1)
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metals
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alkaline earth metals
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beryllium
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Be-10 (1)
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aluminum
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Al-26 (1)
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oxygen
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O-18/O-16 (1)
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fossils
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Chordata
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Vertebrata
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Tetrapoda
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Reptilia
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Diapsida
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Archosauria
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dinosaurs (1)
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microfossils
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Conodonta (1)
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geochronology methods
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exposure age (1)
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U/Pb (1)
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geologic age
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Cenozoic
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Quaternary
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Pleistocene
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Illinoian (1)
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upper Pleistocene
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Wisconsinan
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upper Wisconsinan (2)
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Tertiary (3)
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Mesozoic
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Cretaceous
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Kuskokwim Group (3)
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Jurassic
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Upper Jurassic (1)
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Paleozoic
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Carboniferous
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Mississippian
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Lower Mississippian
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Kayak Shale (1)
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Kekiktuk Conglomerate (1)
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Devonian
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Lower Devonian (1)
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Upper Devonian (1)
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igneous rocks
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igneous rocks
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volcanic rocks (1)
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metamorphic rocks
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metamorphic rocks (1)
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minerals
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carbonates
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smithsonite (1)
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oxides
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hydroxides
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iron hydroxides (1)
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silicates
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orthosilicates
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nesosilicates
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zircon group
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zircon (1)
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Primary terms
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absolute age (2)
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Arctic Ocean
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Amerasia Basin (1)
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Arctic region
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Arctic Coastal Plain (1)
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Russian Arctic
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Novaya Zemlya (1)
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Asia
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Chukotka Russian Federation
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Chukchi Peninsula (1)
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Kolyma Uplift (1)
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Krasnoyarsk Russian Federation
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Taymyr Dolgan-Nenets Russian Federation
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Taymyr Peninsula (1)
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Yakutia Russian Federation
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Verkhoyansk Range (1)
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barite deposits (1)
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bibliography (2)
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biogeography (1)
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biography (1)
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Canada
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Western Canada
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Alberta (1)
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British Columbia (2)
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carbon
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C-13/C-12 (1)
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C-14 (1)
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Cenozoic
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Quaternary
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Pleistocene
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Illinoian (1)
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upper Pleistocene
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Wisconsinan
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upper Wisconsinan (2)
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-
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Tertiary (3)
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Chordata
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Vertebrata
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Tetrapoda
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Reptilia
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Diapsida
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Archosauria
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dinosaurs (1)
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-
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continental drift (1)
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continental shelf (1)
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crust (1)
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dams (1)
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deformation (4)
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earthquakes (1)
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economic geology (5)
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Europe
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Arkhangelsk Russian Federation
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Novaya Zemlya (1)
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faults (3)
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folds (1)
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geochronology (1)
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geomorphology (1)
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geophysical methods (3)
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glacial geology (3)
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ground water (1)
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hydrogeology (1)
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igneous rocks
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volcanic rocks (1)
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isostasy (1)
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isotopes
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radioactive isotopes
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Al-26 (1)
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Be-10 (1)
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C-14 (1)
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stable isotopes
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C-13/C-12 (1)
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O-18/O-16 (1)
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lineation (1)
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mantle (1)
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maps (1)
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marine geology (1)
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Mesozoic
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Cretaceous
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Kuskokwim Group (3)
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Jurassic
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Upper Jurassic (1)
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metal ores
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lead ores (1)
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polymetallic ores (1)
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silver ores (1)
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zinc ores (2)
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-
metals
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alkaline earth metals
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beryllium
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Be-10 (1)
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-
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aluminum
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Al-26 (1)
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-
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metamorphic rocks (1)
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mineral deposits, genesis (2)
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mineral exploration (1)
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Mohorovicic discontinuity (1)
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North America
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Denali Fault (1)
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Yakutat Terrane (1)
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Yukon-Tanana Upland (1)
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orogeny (2)
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oxygen
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O-18/O-16 (1)
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Pacific Ocean
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East Pacific
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Northeast Pacific
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Gulf of Alaska (1)
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-
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North Pacific
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Bering Sea (1)
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Northeast Pacific
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Gulf of Alaska (1)
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Pacific region (1)
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paleoclimatology (1)
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paleoecology (1)
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paleogeography (3)
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Paleozoic
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Carboniferous
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Mississippian
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Lower Mississippian
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Kayak Shale (1)
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Kekiktuk Conglomerate (1)
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Devonian
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Lower Devonian (1)
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Upper Devonian (1)
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permafrost (1)
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petroleum
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natural gas (5)
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plate tectonics (4)
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remote sensing (1)
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roads (1)
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sedimentary rocks
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carbonate rocks (1)
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clastic rocks
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sandstone (1)
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sedimentation (1)
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sediments
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clastic sediments
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boulders (1)
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drift (1)
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South America
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Bolivia (1)
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springs (1)
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stratigraphy (1)
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structural analysis (2)
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structural geology (2)
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tectonics (7)
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tectonophysics (1)
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tunnels (1)
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United States
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Alaska
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Alaska Peninsula (2)
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Alaska Range (2)
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Aleutian Islands (1)
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Aniakchak (1)
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Brooks Range
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Endicott Mountains (1)
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Denali National Park (1)
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Matanuska Glacier (1)
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Matanuska Valley (1)
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Nixon Fork Terrane (1)
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Susitna River (1)
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sedimentary rocks
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sedimentary rocks
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carbonate rocks (1)
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clastic rocks
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sandstone (1)
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sediments
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sediments
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clastic sediments
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boulders (1)
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drift (1)
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Koyukuk Lowlands
Glacial Geology of the Lower Alatna Valley, Brooks Range, Alaska
Glaciers originating in the central Brooks Range extended south into the lower Alatna Valley during three major episodes of Illinoian and Wisconsin glaciation. During the oldest glaciation, coalescing glaciers formed a piedmont ice sheet that extended 60 miles south of the range and covered most of the Koyukuk Lowlands. The later Kobuk Glaciation, subdivided into two stades, was marked by a smaller lobe that terminated in the Koyukuk Lowlands, receded, then readvanced to a frontal position within the Alatna Valley 25 miles closer to the Brooks Range. Drift of the Itkillik Glaciation, which marks the final period of ice advance into the lower Alatna, is subdivided into four moraine belts. Siruk Creek moraines, the oldest and most extensive Itkillik deposits, form an arcuate belt that extends 30 miles south of the range front. The later Chebanika moraine marks a brief readvance or stillstand of glacier ice farther upvalley. Ice then stagnated in the Helpmejack Lakes area, and massive bodies of ice-contact stratified drift were deposited in a broad belt 8 to 15 miles south of the Brooks Range. Moraines at the range front represent the last major event of the Itkillik Glaciation. Subdivisions and correlations of the glacial sequence are based on extent and position of the drift sheets, inferred glacier regimens, postglacial modification of glacial deposits, radiometric dates, and ice limits within the upper Alatna Valley. The four episodes of Itkillik glaciation within the Alatna drainage system appear to be equivalent to four Itkillik stades in the Anaktuvuk Valley, and radiocarbon dates from both areas indicate a late Wisconsin age for Itkillik deposits. The preceding ice advance, correlated with the Kobuk Glaciation farther west, may represent the early Wisconsin. The oldest glaciation is correlated with an ice advance of Illinoian age that filled the Kobuk Valley and extended west into Kotzebue Sound.
Petroleum Possibilities of Yukon-Koyukuk Province, Alaska
Abstract The Yukon-Koyukuk province covers 100,000 sq mi (259,000 sq km) along the west coast of Alaska, extending from the Brooks Range to the Yukon delta, but excluding the Seward Peninsula. It is essentially a vast tract of Cretaceous rocks locally veneered by Quaternary alluviated beds and volcanic rocks. The Cretaceous section contains a large volume of volcanic rocks, and most of the sedimentary sequence consists of first- and second-cycle volcanic debris. Above basal andesitic rocks is a 10,000-ft (3,048 m) section of gray- wacke and mudstone of Albian age, overlain by 10,000 ft or more of shallow-marine and nonmarine paralic sandstone, shale, conglomerate, and coal—dated as late Early and early Late Cretaceous. This part of the strati- graphic section may contain hydrocarbons, but severe structural complications limit the possibilities to two belts, one in the north along the Kobuk River and the other a narrow northeast-southwest band extending 300 mi (483 km) from the Koyukuk Flats to the Yukon- Kuskokwim lowland.
Abstract The east-central Alaska region extends west from the Canadian border to the southeast edge of the Koyukuk basin, and north from the Yukon-Tanana upland to the southeast flank of the Brooks Range (Fig. 1). The region encompasses all or parts of 13 1:250,000 quadrangles and covers an area of about 140,000 km 2 . The physiography of the region (Wahrhaftig, this volume) is extremely diverse (Fig. 1). Steep, mountainous areas having high to moderate relief include parts of the Ogilvie Mountains, White Mountains, Yukon-Tanana upland, Ray Mountains, and southeastern Brooks Range. Areas of dissected plateaus and rolling hills with moderate to low relief include the Porcupine plateau and the Kokrines-Hodzana upland. Lowlands characterize the Yukon Flats basin and extend upstream into other parts of the Yukon River and Porcupine River drainage basins. Bedrock exposures are severely limited in most of the east-central Alaska region. Mountainous areas are locally glaciated, but except in the most rugged parts of the Ogilvie Mountains and parts of the Brooks Range, bedrock is extensively mantled by surficial cover and the colluvial products of alpine weathering processes. Stream cuts commonly offer the best exposures in generally forested or tundra-covered areas of moderate relief. Lowland areas have few pre-Cenozoic bedrock exposures because of extensive surficial cover and tundra. The pioneering reconnaissance studies by J. B. Mertie and his predecessors were carried out in the east-central Alaska region prior to 1940. A relatively small group of geologists conducted the basic geologic mapping during the 1960s and 1970s that defined the
Geology of southwestern Alaska
Abstract Southwest Alaska lies between the Yukon-Koyukuk province to the north, and the Alaska Peninsula to the south (Wahrhaftig, this volume). It includes the southwestern Alaska Range, the Kuskokwim Mountains, the Ahklun Mountains, the Bristol Bay Lowland, and the Minchumina and Holitna basins. It is an area of approximately 175,000 km 2 , and, with the exception of the rugged southwestern Alaska Range and Ahklun Mountains, consists mostly of low rolling hills. The oldest rocks in the region are metamorphic rocks with Early Proterozoic protolith ages that occur as isolated exposures in the central Kuskokwim Mountains, and in fault contact with Mesozoic accretionary rocks of the Bristol Bay region. Precambrian metamorphic rocks also occur in the northern Kuskokwim Mountains and serve as depositional basement for Paleozoic shelf deposits. A nearly continuous sequence of Paleozoic continental margin rocks underlies much of the southwestern Alaska Range and northern Kuskokwim Mountains. The most extensive unit in southwest Alaska is the predominantly Upper Cretaceous Kuskokwim Group, which, in large part, rests unconformably on older rocks of the region. Volcanic rocks of Mesozoic age are common in the Bristol Bay region, and volcanic and plutonic rocks of latest Cretaceous and earliest Tertiary age are common throughout southwest Alaska. Two major northeast-trending faults are known to traverse southwest Alaska, the Denali-Farewell fault system to the south, and the Iditarod-Nixon Fork fault to the north. Latest Cretaceous and Tertiary right-lateral offsets of less than 150 km characterize both faults. The Susulatna lineament (or Poorman fault), north of the Iditarod-Nixon Fork