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NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
Central Africa
-
Angola (1)
-
-
Congo Craton (1)
-
East Africa
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Mozambique (1)
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Zambia (2)
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North Africa
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Algeria
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Bechar Algeria
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Ougarta Algeria (1)
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Berkine Basin (1)
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Egypt
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Kosseir Egypt (1)
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Ghadames Basin (1)
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Sahara (1)
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Southern Africa
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Barberton greenstone belt (1)
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Botswana (1)
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Kaapvaal Craton (4)
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Karoo Basin (1)
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Namibia (1)
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South Africa
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Klerksdorp Field (1)
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Transvaal region (1)
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Witwatersrand (2)
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Zimbabwe (1)
-
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West Africa
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Cameroon (1)
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Ghana (1)
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Zimbabwe Craton (1)
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Arctic Ocean
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Barents Sea (1)
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Arctic region
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Svalbard (1)
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Asia
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Arabian Peninsula
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Oman (3)
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Saudi Arabia (4)
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Buryat Russian Federation (1)
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Central Asia
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Pamirs (1)
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Far East
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China
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Anshan China (1)
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Bohaiwan Basin (1)
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Guizhou China (1)
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Hebei China
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Beijing China (1)
-
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Inner Mongolia China (1)
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Kunlun Mountains (2)
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Liaoning China (1)
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North China Platform (4)
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Shandong China
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Dongying Depression (2)
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Sichuan Basin (2)
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Xinjiang China
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Kuqa Depression (1)
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Tarim Basin (1)
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Japan
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Shikoku (1)
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-
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Indian Peninsula
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India
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Bastar Craton (1)
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Chhattisgarh India (1)
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Gujarat India
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Kutch India (1)
-
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Northeastern India
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Nagaland India (1)
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Pranhita-Godavari Valley (1)
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-
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Lake Baikal (1)
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Middle East
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Dead Sea (1)
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Jordan (1)
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Tyumen Russian Federation (1)
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West Siberia (1)
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Atlantic Ocean
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Equatorial Atlantic (1)
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North Atlantic
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Baltimore Canyon (1)
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Blake Plateau (1)
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Gulf of Guinea (1)
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Gulf of Mexico (2)
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Jeanne d'Arc Basin (1)
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North Sea
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East Shetland Basin (4)
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Troll Field (1)
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Viking Graben (2)
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Northwest Atlantic (4)
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Porcupine Basin (1)
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Scotian Shelf (4)
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South Atlantic
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Espirito Santo Basin (1)
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Southeast Atlantic (1)
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Australasia
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Australia
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Northern Territory Australia (5)
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South Australia
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Flinders Ranges (1)
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Western Australia
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Hamersley Basin (1)
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Hamersley Province (1)
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Black Mountain (1)
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Campos Basin (1)
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Canada
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Eastern Canada
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Maritime Provinces
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New Brunswick
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Saint John County New Brunswick
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Saint John New Brunswick (1)
-
-
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Nova Scotia (3)
-
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Ontario
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Thunder Bay District Ontario
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Thunder Bay Ontario (1)
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-
-
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Mackenzie Mountains (2)
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Nunavut
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Sverdrup Basin (1)
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Queen Elizabeth Islands
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Sverdrup Basin (1)
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Western Canada
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Alberta
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Athabasca Oil Sands (1)
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Athabasca Basin (3)
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British Columbia (8)
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Canadian Rocky Mountains (1)
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Manitoba
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Flin Flon Manitoba (1)
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Northwest Territories (3)
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Reindeer Zone (1)
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Saskatchewan (8)
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Caribbean region
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West Indies
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Antilles
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Greater Antilles
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Cuba (1)
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Lesser Antilles
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Trinidad and Tobago
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Trinidad (1)
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-
-
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Central America
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Belize (1)
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Central Graben (1)
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Coast Ranges (1)
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Commonwealth of Independent States
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Russian Federation
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Buryat Russian Federation (1)
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Lake Baikal (1)
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Tyumen Russian Federation (1)
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West Siberia (1)
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Copperbelt (1)
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Europe
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Baltic region
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Estonia
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Tallinn Estonia (1)
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-
-
Central Europe
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Germany (2)
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Poland
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Swiety Krzyz Mountains (1)
-
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Switzerland (1)
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Upper Rhine Graben (1)
-
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Pyrenees
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Spanish Pyrenees (1)
-
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Southern Europe
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Iberian Peninsula
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Portugal
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Algarve (1)
-
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Spain
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Andalusia Spain
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Huelva Spain (1)
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Betic Cordillera (1)
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Catalonia Spain
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Lleida Spain
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Tremp Spain (1)
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-
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Guadalquivir Basin (1)
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Murcia Spain (1)
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Spanish Pyrenees (1)
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-
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Western Europe
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France (1)
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Ireland (1)
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Scandinavia
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Denmark (3)
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Norway (3)
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United Kingdom
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Great Britain
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Scotland
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Great Glen Fault (1)
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Moray Firth (3)
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Scottish Highlands (1)
-
-
Wales
-
Pembrokeshire Wales (1)
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Welsh Basin (1)
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-
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Northern Ireland (1)
-
-
-
-
Grand Banks (1)
-
Indian Ocean
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Bay of Bengal (1)
-
Red Sea
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Red Sea Rift (1)
-
-
-
International Ocean Discovery Program (1)
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Lusitanian Basin (1)
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Mackenzie River valley (1)
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McArthur Basin (2)
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Mexico
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Baja California (1)
-
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North America
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Basin and Range Province (2)
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Canadian Shield
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Churchill Province
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Rae Province (1)
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-
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Great Lakes
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Lake Huron (1)
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Lake Michigan (1)
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Lake Superior (1)
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Gulf Coastal Plain (3)
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Michigan Basin (2)
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Rocky Mountains
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Canadian Rocky Mountains (1)
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U. S. Rocky Mountains
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Bighorn Mountains (1)
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-
-
Western Canada Sedimentary Basin (4)
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Western Interior
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Western Interior Seaway (1)
-
-
Williston Basin (3)
-
-
North Sea region (4)
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North West Shelf (1)
-
Pacific Ocean
-
East Pacific
-
Northeast Pacific
-
Bristol Bay (1)
-
-
-
North Pacific
-
Bering Sea
-
Bristol Bay (1)
-
-
Northeast Pacific
-
Bristol Bay (1)
-
-
Northwest Pacific
-
Nankai Trough (1)
-
South China Sea
-
Qiongdongnan Basin (1)
-
Yinggehai Basin (1)
-
-
-
-
West Pacific
-
Northwest Pacific
-
Nankai Trough (1)
-
South China Sea
-
Qiongdongnan Basin (1)
-
Yinggehai Basin (1)
-
-
-
-
-
Permian Basin (4)
-
Perth Basin (2)
-
Richmond Basin (1)
-
Sacramento Basin (1)
-
Sacramento Mountains (1)
-
Sacramento Valley (1)
-
San Andreas Fault (1)
-
San Joaquin Basin (4)
-
Sierra Nevada (2)
-
South America
-
Argentina
-
Neuquen Argentina (1)
-
Neuquen Basin (3)
-
-
Bolivia
-
Cochabamba Bolivia (1)
-
-
Colombia
-
Cusiana Field (1)
-
-
Ecuador (3)
-
Oriente Basin (1)
-
Peru (1)
-
-
Staten Island (1)
-
United States
-
Alabama
-
Clarke County Alabama (1)
-
Covington County Alabama (1)
-
-
Alaska
-
Alaska Peninsula (1)
-
Brooks Range (1)
-
National Petroleum Reserve Alaska (1)
-
Prudhoe Bay Field (1)
-
-
Arkansas (1)
-
Atlantic Coastal Plain (4)
-
Bighorn Basin (1)
-
Book Cliffs (1)
-
California
-
Central California (2)
-
Hosgri Fault (1)
-
Kern County California
-
Kern River Field (1)
-
-
Los Angeles County California
-
Los Angeles California
-
Northridge California (1)
-
-
-
San Fernando Valley (1)
-
San Gregorio Fault (1)
-
San Joaquin Valley (1)
-
Santa Ynez Mountains (1)
-
Southern California (1)
-
-
Colorado
-
Archuleta County Colorado (1)
-
Piceance Basin (1)
-
Rangely Anticline (1)
-
Rio Blanco County Colorado (1)
-
San Juan volcanic field (1)
-
-
Colorado Plateau (1)
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Columbia Plateau (1)
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Dan River basin (1)
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District of Columbia (1)
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Dunkard Basin (1)
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Eastern U.S. (1)
-
Florida
-
Collier County Florida (1)
-
Indian River County Florida (1)
-
Lee County Florida (1)
-
Miami-Dade County Florida (1)
-
Monroe County Florida (1)
-
Okeechobee County Florida (1)
-
Orange County Florida (1)
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Palm Beach County Florida (1)
-
-
Idaho
-
Elmore County Idaho (1)
-
Snake River plain (1)
-
-
Iowa (1)
-
Kansas
-
Barber County Kansas (1)
-
Chautauqua County Kansas (3)
-
Cowley County Kansas (1)
-
Douglas County Kansas (2)
-
Elk County Kansas (1)
-
Harper County Kansas (2)
-
Jefferson County Kansas (1)
-
Kingman County Kansas (2)
-
Labette County Kansas (1)
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Leavenworth County Kansas (1)
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Montgomery County Kansas (1)
-
Wyandotte County Kansas (1)
-
-
Louisiana (1)
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Maine (1)
-
Maryland
-
Cecil County Maryland (1)
-
-
Michigan
-
Michigan Lower Peninsula
-
Montcalm County Michigan (1)
-
-
Michigan Upper Peninsula
-
Keweenaw Peninsula (1)
-
-
-
Midcontinent (2)
-
Midwest (1)
-
Minnesota
-
Brown County Minnesota (1)
-
Duluth Complex (1)
-
Mesabi Range (1)
-
Nicollet County Minnesota (1)
-
Saint Louis County Minnesota
-
Duluth Minnesota (1)
-
-
-
Mississippi
-
Lauderdale County Mississippi (1)
-
-
Missouri (1)
-
Nevada
-
Clark County Nevada (1)
-
Lander County Nevada (1)
-
-
New England (1)
-
New Jersey
-
New Jersey Highlands (1)
-
-
New Mexico
-
Eddy County New Mexico (1)
-
-
Ohio
-
Athens County Ohio (1)
-
-
Oklahoma
-
Osage County Oklahoma (1)
-
-
Orogrande Basin (1)
-
Powder River basin (1)
-
South Carolina
-
Aiken County South Carolina (1)
-
Chesterfield County South Carolina (1)
-
Savannah River Site (1)
-
-
Texas
-
East Texas (1)
-
Fort Worth Basin (1)
-
Hood County Texas (1)
-
Midland Basin (1)
-
Reagan County Texas (1)
-
Rusk County Texas (1)
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Somervell County Texas (1)
-
West Texas (1)
-
-
U. S. Rocky Mountains
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Uinta Basin (2)
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Utah
-
Emery County Utah (1)
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Garfield County Utah (2)
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Grand County Utah (1)
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Kaiparowits Plateau (1)
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Uintah County Utah (1)
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Wasatch Plateau (1)
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Virginia
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Walker Lane (1)
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Wyoming
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Johnson County Wyoming (2)
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Natrona County Wyoming (1)
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Park County Wyoming (1)
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Sheridan County Wyoming (1)
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Washakie County Wyoming (1)
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Western Desert (1)
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commodities
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bitumens
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brines (4)
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mineral deposits, genesis (16)
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shale oil (2)
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strategic minerals (1)
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tight sands (1)
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water resources (1)
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elements, isotopes
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carbon
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C-13/C-12 (12)
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C-14 (1)
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organic carbon (4)
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chemical ratios (3)
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halogens
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bromine
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hydrogen
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D/H (1)
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deuterium (1)
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tritium (1)
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isotope ratios (25)
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isotopes
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radioactive isotopes
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Pb-206/Pb-204 (2)
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Ra-226 (1)
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Re-187/Os-188 (1)
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Rn-222 (1)
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tritium (1)
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U-235 (1)
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U-238 (2)
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stable isotopes
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C-13/C-12 (12)
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Cr-53/Cr-52 (3)
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D/H (1)
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deuterium (1)
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Fe-56/Fe-54 (3)
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Fe-57 (1)
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Nd-144/Nd-143 (1)
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Ni-60 (1)
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O-17/O-16 (1)
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O-18/O-16 (9)
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Os-188/Os-187 (2)
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Pb-206 (1)
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Pb-206/Pb-204 (2)
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Pb-207 (1)
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Pb-208 (1)
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Re-187/Os-188 (1)
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S-33/S-32 (1)
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S-34/S-32 (4)
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Sr-87/Sr-86 (5)
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large-ion lithophile elements (1)
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metals
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actinides
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thorium
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uranium
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U-235 (1)
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U-238 (2)
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alkali metals
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potassium (1)
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alkaline earth metals
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magnesium (1)
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radium
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Ra-226 (1)
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strontium
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Sr-87/Sr-86 (5)
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aluminum (1)
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arsenic (1)
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chromium
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Cr-53/Cr-52 (3)
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cobalt (1)
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copper (1)
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iron
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Fe-56/Fe-54 (3)
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ferrous iron (3)
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lead
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Pb-206 (1)
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Pb-206/Pb-204 (2)
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Pb-207 (1)
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Pb-208 (1)
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manganese
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Mn-53 (1)
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mercury (1)
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molybdenum (2)
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nickel
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Ni-60 (1)
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platinum group
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osmium
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Os-188/Os-187 (2)
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Re-187/Os-188 (1)
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rare earths
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neodymium
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Nd-144/Nd-143 (1)
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yttrium (1)
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rhenium
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Re-187/Os-188 (1)
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silver (1)
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titanium (1)
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vanadium (3)
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noble gases
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radon
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Rn-222 (1)
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oxygen
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O-17/O-16 (1)
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O-18/O-16 (9)
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phosphorus (2)
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silicon (1)
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sulfur
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S-33/S-32 (1)
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S-34/S-32 (4)
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trace metals (3)
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fossils
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bacteria (1)
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burrows (17)
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Chordata
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Vertebrata
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Diapsida
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Lepidosauria
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Invertebrata
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Arthropoda
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Mandibulata
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Insecta (2)
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Trilobitomorpha
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Brachiopoda
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Cnidaria
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Echinodermata
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Crinozoa
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Crinoidea (1)
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Mollusca
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Vermes
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Gymnospermae
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problematic fossils
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Sm/Nd (1)
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U/Pb (4)
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geologic age
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Cenozoic
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lower Cenozoic (1)
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Quaternary
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Holocene (2)
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Pleistocene
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lower Pleistocene
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Gelasian (1)
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upper Quaternary (3)
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Tertiary
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Neogene
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Miocene
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lower Miocene (1)
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upper Miocene (2)
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Pliocene
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Cimmerian (1)
-
-
-
Paleogene
-
Eocene
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Green River Formation (2)
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lower Eocene
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Willwood Formation (1)
-
-
middle Eocene
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Tallahatta Formation (1)
-
-
upper Eocene (1)
-
-
Oligocene
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lower Oligocene (1)
-
-
Paleocene (1)
-
-
-
-
Mesozoic
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Cretaceous
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Comanchean
-
Glen Rose Formation (1)
-
-
Dakota Formation (1)
-
Logan Canyon Formation (1)
-
Lower Cretaceous
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Albian (6)
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Aptian
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lower Aptian (1)
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Barremian (3)
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Berriasian (1)
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Bluesky Formation (1)
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Glen Rose Formation (1)
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McMurray Formation (1)
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Missisauga Formation (1)
-
Mowry Shale (1)
-
-
Mancos Shale (2)
-
Natih Formation (1)
-
Potomac Group (3)
-
Upper Cretaceous
-
Belly River Formation (1)
-
Blackhawk Formation (1)
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Campanian
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Dinosaur Park Formation (1)
-
-
Cenomanian
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lower Cenomanian (1)
-
-
Cody Shale (1)
-
Dawson Canyon Formation (1)
-
Ferron Sandstone Member (1)
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Frontier Formation (1)
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Horseshoe Canyon Formation (1)
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Maestrichtian (1)
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Mesaverde Group (1)
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Middendorf Formation (1)
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Niobrara Formation (1)
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Santonian (1)
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Senonian (2)
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Shannon Sandstone Member (1)
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Straight Cliffs Formation (2)
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Turonian
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lower Turonian (1)
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Wall Creek Member (1)
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Viking Formation (1)
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Jurassic
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Aztec Sandstone (1)
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Heather Formation (1)
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Lower Jurassic
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Dunlin Group (1)
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Toarcian
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lower Toarcian (1)
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upper Liassic (1)
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Mic Mac Formation (1)
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Middle Jurassic
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Bajocian
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Brent Group (1)
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Broom Formation (1)
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Etive Formation (1)
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Ness Formation (1)
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Rannoch Formation (1)
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Tarbert Formation (1)
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Callovian (1)
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Upper Jurassic
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Arab Formation (1)
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Kimmeridge Clay (1)
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Kimmeridgian (1)
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Oxfordian
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middle Oxfordian (1)
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Tithonian (1)
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Newark Supergroup (2)
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Statfjord Formation (1)
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Triassic
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Lower Triassic
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Griesbachian (1)
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Permian-Triassic boundary (3)
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Montney Formation (6)
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Upper Triassic
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Carnian (1)
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Sag River Sandstone (1)
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-
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upper Mesozoic (1)
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Vaca Muerta Formation (3)
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Paleozoic
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Cambrian
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Lower Cambrian (1)
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Middle Cambrian (1)
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Carboniferous
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Lower Carboniferous
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Dinantian (1)
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Mississippian
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Barnett Shale (1)
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Lower Mississippian (2)
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Middle Mississippian
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Visean (1)
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Upper Mississippian
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Chesterian (1)
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Pennsylvanian
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Lower Pennsylvanian (1)
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Monongahela Group (1)
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Upper Pennsylvanian
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Holder Formation (1)
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Virgilian
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Douglas Group (2)
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Lawrence Formation (1)
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Shawnee Group (1)
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Tonganoxie Sandstone (1)
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Wabaunsee Group (1)
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Upper Carboniferous (1)
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Devonian
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Middle Devonian
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Dundee Limestone (1)
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Winnipegosis Formation (1)
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Upper Devonian
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Frasnian (1)
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Palliser Formation (1)
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Dunkard Group (1)
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Exshaw Formation (1)
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Lisburne Group (1)
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lower Paleozoic
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Penobscot Formation (1)
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Ordovician (1)
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Permian
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Lower Permian
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Wolfcampian (1)
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Maokou Formation (1)
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Middle Permian (2)
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Unayzah Formation (1)
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Upper Permian
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Permian-Triassic boundary (3)
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Vryheid Formation (1)
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Whitehill Formation (1)
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Silurian
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Lower Silurian
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Llandovery
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Telychian (1)
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Wenlock (2)
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upper Paleozoic
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Bakken Formation (2)
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Phanerozoic (1)
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Precambrian
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Animikie Group (1)
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Archean
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Biwabik Iron Formation (1)
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Central Rand Group (1)
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Gunflint Iron Formation (1)
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Hamersley Group (1)
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upper Precambrian
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Proterozoic
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Great Oxidation Event (4)
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Mesoproterozoic
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Roper Group (3)
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Neoproterozoic
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Paleoproterozoic (9)
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Witwatersrand Supergroup (3)
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igneous rocks
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carbonatites (1)
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volcanic rocks
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andesites (1)
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basalts
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glasses
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volcanic glass (1)
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pyroclastics
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metamorphic rocks
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gneisses
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amphibole group
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pyroxene group (1)
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framework silicates
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orthosilicates
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phenakite group
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zircon group
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sheet silicates
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clay minerals
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illite (5)
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serpentine group
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stilpnomelane (1)
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sulfates
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sulfides
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pyrite (4)
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-
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Primary terms
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absolute age (5)
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Africa
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West Africa
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Japan
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atmosphere (2)
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carbon
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C-13/C-12 (12)
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Caribbean region
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Cenozoic
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Quaternary
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upper Quaternary (3)
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Tertiary
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Neogene
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Pliocene
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Cimmerian (1)
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Paleogene
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Eocene
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Green River Formation (2)
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lower Eocene
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Willwood Formation (1)
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middle Eocene
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Tallahatta Formation (1)
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upper Eocene (1)
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Oligocene
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Paleocene (1)
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Central America
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chemical analysis (1)
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Chordata
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Diapsida
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Mosasauridae (1)
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clay mineralogy (2)
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Europe
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faults (17)
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land use (1)
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Mesozoic
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Cretaceous
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Comanchean
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Glen Rose Formation (1)
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Dakota Formation (1)
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Logan Canyon Formation (1)
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Lower Cretaceous
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Albian (6)
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Aptian
-
lower Aptian (1)
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Barremian (3)
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Berriasian (1)
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Bluesky Formation (1)
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Glen Rose Formation (1)
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McMurray Formation (1)
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Missisauga Formation (1)
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Mowry Shale (1)
-
-
Mancos Shale (2)
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Natih Formation (1)
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Potomac Group (3)
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Upper Cretaceous
-
Belly River Formation (1)
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Blackhawk Formation (1)
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Campanian
-
Dinosaur Park Formation (1)
-
-
Cenomanian
-
lower Cenomanian (1)
-
-
Cody Shale (1)
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Dawson Canyon Formation (1)
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Ferron Sandstone Member (1)
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Frontier Formation (1)
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Horseshoe Canyon Formation (1)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Robbins Shale Member
Changes in Kansas Stratigraphic Nomenclature: GEOLOGICAL NOTES Available to Purchase
MAPESITES , A NEW UPPER PENNSYLVANIAN (LOWER VIRGILIAN) AMMONOID FROM KANSAS Available to Purchase
—Generalized Pennsylvanian stratigraphic sequence in eastern Kansas. In for... Available to Purchase
Neoproterozoic glacial deposits of Tasmania Available to Purchase
Abstract In Tasmania, Neoproterozoic glaciogenic deposits were laid down in one or more epicratonic basins, probably situated at the eastern margin of the Australian–Antarctic craton. Rifting and volcanism took place in the late Cryogenian to early Ediacaran. On King Island, north of Tasmania, the Cottons Breccia consists of 50–200 m of diamictite, conglomerate and sandstone. Limestone and dolostone clasts are abundant in the diamictite, although carbonate is unknown in the underlying successions. The Cottons Breccia is overlain by 10 m of laminated dolostone and limestone with a negative, upward-decreasing δ 13 C profile. Rift volcanics and shallow intrusives higher in the sequence are dated at c. 575 Ma. In NW Tasmania, two diamictite units are found in the Togari Group. The Julius River Member, 200 m thick, contains dominantly dolostone clasts and overlies a shallow-marine dolostone unit with vase-shaped microfossils and C-isotopes consistent with a mid-Cryogenian age. Some clasts in the Julius River Member contain a stromatolite ( Baicalia cf. B. burra ) very similar to a form that is abundant in the middle part of the Burra Group, Adelaide rift basin. The Julius River Member is immediately overlain by black shale and impure carbonate dated by Re–Os at 641±5 Ma. The younger diamictite in the Togari Group is the Croles Hill Diamictite, 70 m thick, with predominantly volcanic clasts, underlain by a shale and mafic-volcaniclastic succession and overlain by thin mudstone followed by thick rift tholeiites. At one locality this diamictite is underlain by a rhyodacite flow dated at 582±4 Ma. In southern Tasmania, diamictites are found in the Wedge River Beds and in the Cotcase Creek Formation (Fm.) (Weld River Group). Laminated siltstone with dropstones is associated with the diamictites in the Cotcase Creek Fm. The southern Tasmanian deposits are poorly constrained in age. Chronometric and other evidence suggests correlation of the Julius River Member, Cottons Breccia and Croles Hill Diamictite with the Sturt, Elatina and Gaskiers glacial phases, respectively. However, a glacial origin for the Julius River Member and Croles Hill Diamictite remains uncertain.
Major ion pore-water chemistry evolution in Lake Michigan benthic sediments: Evidence for direct input from Michigan Basin saline groundwater Open Access
Mesoproterozoic oxygenation event: From shallow marine to atmosphere Available to Purchase
How does weathering influence geochemical proxies in Paleoproterozoic banded iron formations? A case study from outcrop samples of 2.46 Ga banded iron formation, Hamersley Basin, Western Australia Available to Purchase
Mineralogy of the 1.45 Ga Wafangzi manganese deposit in North China: Implications for pulsed Mesoproterozoic oxygenation events Available to Purchase
Stratigraphic Architecture of the Tonganoxie Paleovalley Fill (Lower Virgilian) in Northeastern Kansas Available to Purchase
Early Cretaceous (Albian) spores and pollen from the Glen Rose Formation of Texas and their significance for correlation of the Potomac Group Available to Purchase
Phytoplankton contributions to the trace-element composition of Precambrian banded iron formations Available to Purchase
Geochemical Characteristics of Sedimentary Rocks in Scotian Basin Available to Purchase
Fate of cobalt and nickel in mackinawite during diagenetic pyrite formation Available to Purchase
Shallow seawater oxygenation at ca. 1.44 Ga: A reflection of local seafloor oxygen oases or extensive water-column oxygenation? Available to Purchase
THE IMPERIAL FORMATION, NORTHEASTERN MACKENZIE MOUNTAINS, N.W.T. Available to Purchase
Timing of early angiosperm radiation: recalibrating the classical succession Available to Purchase
Variation of lacustrine carbonate deposition in the Eocene Dongying Depression and its comparison with Holocene environments Available to Purchase
Geologic Model for the Assessment of Technically Recoverable Oil in the Devonian–Mississippian Bakken Formation, Williston Basin Available to Purchase
Abstract The Upper Devonian and Lower Mississippian Bakken Formation in the United States part of the Williston Basin is a giant continuous (unconventional) oil resource. A recent U.S. Geological Survey (USGS) assessment estimated a mean volume of undiscovered technically recoverable oil for the Bakken Formation of about 3.65 billion bbl of oil. The estimate is based on a geologic model and a methodology that defines different assessment units by accumulation type (conventional or continuous), structural control, fracture occurrence and prediction, lithology and petrophysical properties, formation thickness, underlying salt movement or dissolution, and level of thermal maturity and oil-generation capacity of Bakken source rocks. The Bakken Formation consists of three informal members: (1) lower shale member; (2) middle sandstone member; and (3) upper shale member. Shale members are rich in marine organic matter (as much as 35% by weight) and are the petroleum source rocks, whereas the middle sandstone member varies in depositional facies and lithology and locally exhibits good matrix porosity (as much as 14%) but with low permeability, a characteristic of tight reservoirs. Additional commingled production occurs locally from matrix porosity in the immediately underlying, informally named, Sanish sand unit of the Upper Devonian Three Forks Formation. Combined, the Bakken Formation and Sanish sand define the Bakken composite continuous reservoir. On a larger scale, thermally mature organic-rich Bakken shale members are also the source for oils produced from locally occurring Waulsortian mounds or porous strata immediately above the upper shale member in the overlying Lower Mississippian Lodgepole Limestone. As a whole, elements of petroleum source, reservoir, seal, migration, and trap define the stratigraphic and geographic character of a Bakken-Lodgepole Total Petroleum System. The geographic extent of the continuous oil accumulation within the United States part of the Bakken Formation is defined as the area in which organic-rich shale members of the Bakken Formation are thermally mature with respect to oil-generation. The area of the oil-generation window for the Bakken Formation continuous reservoir was determined using a combination of the following: (1) contour mapping of both the hydrogen index (HI) and log-resistivity well data of the upper shale member, (2) calibration of HI to the transformation ratio (TR) from one-dimensional burial history models, and (3) calibration of HI to total organic content. The geologic model used to further define continuous assessment units (AUs) within the Bakken Formation continuous oil accumulation was, in general, based on assumed levels of thermal maturity and generation capacity of the Bakken shale members as determined from HI and TR, relation of HI and TR to potential fracturing and structural complexity of the Williston Basin, and lithofacies distribution and petrophysical character of the middle sandstone member. The area of the oil generation window was divided into five continuous AUs: (1) Elm Coulee-Billings Nose AU, (2) Central Basin-Poplar Dome AU, (3) Nesson-Little Knife Structural AU, (4) Eastern Expulsion Threshold AU, and (5) Northwest Expulsion Threshold AU. One hypothetical conventional AU, a Middle Sandstone Member AU, was defined external to the area of oil generation. Using the established U.S. Geological Survey methodology, assessment of each Bakken continuous AU was performed after estimation of effective well drainage areas, estimated ultimate recovery (EUR) from productive wells, and production success defined by a minimum EUR of 2000 bbl of oil. The AUs with the greatest resource potential are the Eastern Expulsion Threshold AU (mean volume, 0.973 billion bbl of oil), which is best represented by the Parshall and Sanish fields of Mountrail County, North Dakota, and the Nesson-Little Knife Structural AU (mean volume, 0.908 billion bbl of oil), where structural reservoir development exists, the middle sandstone member is thick and porous, the underlying Sanish sand reservoir unit is commonly present, and shale members have high oil-generation potential and the probability of abundant natural fracturing.