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NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
East Africa (1)
-
East African Rift (1)
-
Madagascar
-
Mahajanga Basin (1)
-
-
North Africa
-
Algeria (1)
-
Egypt (1)
-
-
Southern Africa
-
South Africa (1)
-
-
West Africa
-
Ghana (2)
-
-
-
Arctic Ocean
-
Norwegian Sea
-
More Basin (1)
-
-
-
Arctic region
-
Arctic Coastal Plain (1)
-
-
Asia
-
Amu Darya Basin (1)
-
Arabian Peninsula (1)
-
Far East
-
Borneo (1)
-
China
-
Guangxi China (1)
-
Guizhou China (1)
-
Qinling Mountains (1)
-
Xinjiang China
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Kuqa Depression (1)
-
Tarim Basin (3)
-
-
Yangtze Platform (1)
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Yangtze River valley (1)
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Indonesia (1)
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Taiwan (1)
-
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Himalayas (1)
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Indian Peninsula
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Bangladesh (1)
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India
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Deccan Plateau (1)
-
Ghats
-
Western Ghats (1)
-
-
-
Pakistan (1)
-
-
Kyrgyzstan (1)
-
Middle East
-
Iran
-
Elburz (1)
-
-
Iraq (1)
-
Turkey
-
Anatolia (1)
-
-
Zagros (2)
-
-
Siberia (1)
-
Tien Shan (2)
-
Turkmenia (1)
-
-
Atlantic Ocean
-
North Atlantic
-
Faeroe-Shetland Basin (1)
-
Gulf of Guinea (1)
-
Gulf of Mexico (4)
-
Hudson Bay (1)
-
North Sea (4)
-
Porcupine Basin (1)
-
Rockall Trough (1)
-
-
South Atlantic
-
Espirito Santo Basin (1)
-
Southeast Atlantic (1)
-
-
-
Australasia
-
Australia
-
Lachlan fold belt (1)
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New South Wales Australia (1)
-
Queensland Australia (1)
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South Australia
-
Flinders Ranges (1)
-
-
Victoria Australia (1)
-
Western Australia
-
Canning Basin (1)
-
Carnarvon Basin (1)
-
Murchison Province (1)
-
Yilgarn Craton (1)
-
-
-
New Zealand
-
Otago New Zealand (1)
-
-
-
Barrow Sub-basin (1)
-
Bear River basin (1)
-
Browse Basin (1)
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Cache Creek Terrane (1)
-
Campos Basin (1)
-
Canada
-
Eastern Canada
-
Maritime Provinces
-
New Brunswick
-
Moncton Basin (1)
-
-
Nova Scotia
-
Cape Breton Island (2)
-
Halifax County Nova Scotia
-
Halifax Nova Scotia (1)
-
-
-
-
Meguma Terrane (2)
-
Newfoundland and Labrador
-
Newfoundland (2)
-
-
Ontario
-
Bruce County Ontario (1)
-
Bruce Peninsula (1)
-
Cochrane District Ontario
-
Timmins Ontario (1)
-
-
-
-
Hudson Bay (1)
-
Nunavut (1)
-
Western Canada
-
Alberta (2)
-
British Columbia
-
Princeton British Columbia (1)
-
Vancouver British Columbia (1)
-
-
Canadian Cordillera (4)
-
Manitoba
-
Lynn Lake Manitoba (1)
-
-
Northwest Territories (1)
-
Saskatchewan
-
La Ronge Domain (1)
-
-
Yukon Territory (5)
-
-
-
Caribbean region
-
West Indies
-
Antilles
-
Lesser Antilles
-
Barbados (1)
-
Trinidad and Tobago
-
Trinidad (1)
-
-
-
-
-
-
Cascade Range (1)
-
Cascadia subduction zone (2)
-
Casper Mountain (2)
-
Central Graben (1)
-
Channeled Scabland (1)
-
Coast Ranges (3)
-
Columbia River (2)
-
Commonwealth of Independent States
-
Caucasus (1)
-
Kyrgyzstan (1)
-
Russian Federation (1)
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Turkmenia (1)
-
-
Cook Inlet (1)
-
Cooper Basin (1)
-
Death Valley (2)
-
Diablo Range (1)
-
Europe
-
Caucasus (1)
-
Central Europe
-
Germany
-
Lower Saxony Germany
-
Gorleben (1)
-
-
-
Poland (1)
-
Vienna Basin (1)
-
-
Lublin Basin (1)
-
Southern Europe
-
Iberian Peninsula
-
Spain
-
Aragon Spain (1)
-
-
-
Italy
-
Apennines
-
Southern Apennines (1)
-
-
Apulia Italy
-
Gargano (1)
-
Murge (1)
-
-
Basilicata Italy (1)
-
-
Romania
-
Transylvania
-
Harghita Romania (1)
-
-
-
-
Western Europe
-
Scandinavia
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Norway (1)
-
-
United Kingdom
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Great Britain
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England
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Manchester England (1)
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Shropshire England (1)
-
Warwickshire England (1)
-
-
Wales
-
Gwynedd Wales
-
Harlech Dome (1)
-
-
-
-
-
-
-
Front Range (3)
-
Green River (1)
-
Green River basin (4)
-
Guadalupe Mountains (1)
-
Gulf of Mexico Basin (2)
-
Hanson Lake (1)
-
Indian Ocean
-
Arabian Sea
-
Persian Gulf (2)
-
-
Bay of Bengal (1)
-
Dampier Sub-basin (1)
-
Exmouth Plateau (1)
-
Timor Sea
-
Bonaparte Gulf basin (1)
-
Vulcan Sub-basin (1)
-
-
-
Indian Ocean Islands
-
Madagascar
-
Mahajanga Basin (1)
-
-
-
Madison Range (1)
-
Malay Archipelago
-
Borneo (1)
-
-
Maverick Basin (1)
-
Mexico (3)
-
Mosquito Range (1)
-
Murray Basin (1)
-
North America
-
Appalachian Basin (1)
-
Appalachians
-
Blue Ridge Mountains (2)
-
Blue Ridge Province (2)
-
Carolina slate belt (1)
-
Central Appalachians (1)
-
Piedmont (2)
-
Southern Appalachians (2)
-
Valley and Ridge Province (1)
-
-
Basin and Range Province
-
Great Basin (1)
-
-
Canadian Shield
-
Churchill Province
-
Hearne Province (1)
-
Rae Province (1)
-
-
Flin Flon Belt (1)
-
Superior Province
-
Abitibi Belt (1)
-
-
-
Great Plains
-
Northern Great Plains (2)
-
-
Gulf Coastal Plain (10)
-
Intermontane Belt (1)
-
North American Cordillera
-
Canadian Cordillera (4)
-
-
North American Craton (1)
-
Ogilvie Mountains (1)
-
Rio Grande Depression (1)
-
Rio Grande Rift (1)
-
Rocky Mountains
-
Central Rocky Mountains (1)
-
Northern Rocky Mountains (5)
-
Southern Rocky Mountains (3)
-
U. S. Rocky Mountains
-
Absaroka Range (1)
-
Bighorn Mountains (2)
-
Bitterroot Range
-
Beaverhead Mountains (1)
-
-
Bridger Range (1)
-
Little Belt Mountains (1)
-
Sangre de Cristo Mountains (1)
-
Spanish Peaks (1)
-
Tendoy Range (1)
-
Tobacco Root Mountains (1)
-
Uinta Mountains (1)
-
Wind River Range (1)
-
-
-
Rocky Mountains foreland (2)
-
Shuswap Complex (1)
-
Western Canada Sedimentary Basin (1)
-
Western Interior
-
Western Interior Seaway (1)
-
-
Western Overthrust Belt (3)
-
Williston Basin (7)
-
Yukon-Tanana Terrane (2)
-
-
North West Shelf (1)
-
Owens Valley (3)
-
Pacific Ocean
-
East Pacific
-
Northeast Pacific
-
Mendocino fracture zone (1)
-
-
-
North Pacific
-
Northeast Pacific
-
Mendocino fracture zone (1)
-
-
-
West Pacific
-
Indonesian Seas
-
Makassar Strait (1)
-
-
-
-
Peninsular Ranges (1)
-
Permian Basin (4)
-
Rattlesnake Mountain (1)
-
Red Mountain (1)
-
Ruby Range (1)
-
Sacramento Valley (1)
-
San Andreas Fault (8)
-
San Joaquin Basin (3)
-
Santa Clara Valley (2)
-
Santa Cruz Mountains (1)
-
Santa Lucia Range (1)
-
Santa Maria Basin (2)
-
Searles Lake (1)
-
Sierra Nevada (5)
-
South America
-
Argentina
-
Neuquen Argentina (1)
-
-
Bolivia (1)
-
Brazil (1)
-
Precordillera (1)
-
Venezuela
-
Orinoco Delta (1)
-
-
-
South Island (1)
-
South Mountain Batholith (1)
-
Taranaki Basin (1)
-
United States
-
Alabama (3)
-
Alaska (4)
-
Albuquerque Basin (1)
-
Anadarko Basin (1)
-
Arizona
-
Rincon Mountains (1)
-
-
Arkansas
-
Columbia County Arkansas (1)
-
Scott County Arkansas (1)
-
-
Arkansas River valley (1)
-
Arkoma Basin (1)
-
Atlantic Coastal Plain (1)
-
Bighorn Basin (5)
-
Blue Ridge Mountains (2)
-
Book Cliffs (2)
-
California
-
Central California (6)
-
Channel Islands
-
San Clemente Island (1)
-
-
Coachella Valley (1)
-
Cuyama Basin (1)
-
Fresno County California
-
Coalinga California (1)
-
-
Garlock Fault (2)
-
Hosgri Fault (1)
-
Inyo County California
-
Coso Hot Springs KGRA (1)
-
Coso Range (2)
-
Inyo Mountains (2)
-
Owens Lake (2)
-
Panamint Range (1)
-
-
Los Angeles County California
-
San Clemente Island (1)
-
-
Mariposa County California (1)
-
Mono County California (1)
-
San Bernardino County California
-
Cajon Pass (1)
-
-
San Francisco Bay region (1)
-
San Gabriel Mountains (1)
-
San Joaquin Valley (1)
-
San Luis Obispo County California
-
Carrizo Plain (1)
-
-
Santa Clara County California (2)
-
Sierra Nevada Batholith (1)
-
Southern California (8)
-
Transverse Ranges (4)
-
Tuolumne County California (1)
-
Ventura Basin (1)
-
Ventura County California
-
Ventura California (1)
-
-
-
Cambridge Arch (1)
-
Central Basin Platform (2)
-
Chadron Arch (1)
-
Colorado
-
Boulder County Colorado (1)
-
Chaffee County Colorado
-
Salida Colorado (1)
-
-
Clear Creek County Colorado (1)
-
Douglas County Colorado (1)
-
El Paso County Colorado (2)
-
Fremont County Colorado
-
Canon City Colorado (1)
-
-
Gilpin County Colorado (1)
-
Jefferson County Colorado (1)
-
Larimer County Colorado (1)
-
Las Animas County Colorado (1)
-
Mesa County Colorado (1)
-
Montezuma County Colorado (1)
-
Park County Colorado (1)
-
Piceance Basin (1)
-
Pueblo County Colorado (1)
-
Saguache County Colorado (1)
-
Teller County Colorado (1)
-
-
Colorado Plateau (5)
-
Columbia Plateau (1)
-
Delaware
-
New Castle County Delaware (1)
-
-
Delaware Basin (1)
-
Denver Basin (4)
-
Eastern California shear zone (1)
-
Florida (2)
-
Four Corners (1)
-
Georgia
-
Bartow County Georgia
-
Cartersville Georgia (1)
-
-
Cherokee County Georgia (1)
-
-
Great Basin (1)
-
Idaho
-
Idaho County Idaho (1)
-
Lemhi County Idaho (1)
-
Snake River plain (1)
-
-
Illinois (3)
-
Illinois Basin (2)
-
Indiana
-
Marion County Indiana (1)
-
Posey County Indiana (1)
-
Spencer County Indiana (1)
-
Vanderburgh County Indiana (1)
-
-
Kansas (1)
-
Kentucky (3)
-
Louisiana
-
Claiborne Parish Louisiana (1)
-
Lincoln Parish Louisiana (1)
-
-
Maryland (2)
-
Massachusetts (1)
-
Midcontinent (4)
-
Midwest (1)
-
Mississippi
-
Choctaw County Mississippi (1)
-
-
Mississippi Valley (1)
-
Missouri
-
Taney County Missouri (1)
-
-
Mojave Desert (2)
-
Montana
-
Beaverhead County Montana
-
Tendoy Range (1)
-
-
Bridger Range (1)
-
Dawson County Montana (1)
-
Gallatin County Montana (2)
-
Lewis and Clark County Montana
-
Helena Montana (1)
-
-
Little Belt Mountains (1)
-
Madison County Montana
-
Tobacco Root Mountains (1)
-
-
Teton County Montana (1)
-
-
Moxa Arch (2)
-
Nebraska (1)
-
Nevada
-
Carlin Trend (3)
-
Clark County Nevada (1)
-
Elko County Nevada
-
Independence Mountains (1)
-
Pequop Mountains (1)
-
-
Eureka County Nevada (1)
-
Humboldt County Nevada (1)
-
Nye County Nevada
-
Yucca Mountain (2)
-
-
Roberts Mountains Allochthon (1)
-
Storey County Nevada (1)
-
White Pine County Nevada (1)
-
-
New Madrid region (2)
-
New Mexico
-
Bernalillo County New Mexico (1)
-
Dona Ana County New Mexico (1)
-
Grant County New Mexico (1)
-
Hidalgo County New Mexico (1)
-
Jemez Lineament (1)
-
Luna County New Mexico (1)
-
Picuris Range (2)
-
Rio Arriba County New Mexico (1)
-
San Miguel County New Mexico (1)
-
Sandoval County New Mexico (1)
-
Santa Fe County New Mexico (1)
-
Taos County New Mexico (1)
-
Torrance County New Mexico (1)
-
Tusas Mountains (1)
-
Valencia County New Mexico (1)
-
-
New York (3)
-
North Carolina
-
Montgomery County North Carolina (1)
-
Randolph County North Carolina (1)
-
-
North Dakota (8)
-
Ohio
-
Shelby County Ohio (1)
-
-
Oklahoma
-
Canadian County Oklahoma (1)
-
Kingfisher County Oklahoma (1)
-
Le Flore County Oklahoma (1)
-
-
Oregon
-
Coos County Oregon
-
Coos Bay (1)
-
-
Multnomah County Oregon
-
Portland Oregon (1)
-
-
Washington County Oregon (1)
-
Willamette Valley (1)
-
Yamhill County Oregon (1)
-
-
Ouachita Mountains (2)
-
Ozark Mountains (3)
-
Paradox Basin (3)
-
Pennsylvania
-
Blair County Pennsylvania (2)
-
Cambria County Pennsylvania (1)
-
Huntingdon County Pennsylvania (1)
-
Mifflin County Pennsylvania (1)
-
Washington County Pennsylvania (1)
-
-
Powder River basin (4)
-
Reelfoot Rift (1)
-
Rhode Island (1)
-
Sevier orogenic belt (8)
-
South Carolina
-
Chesterfield County South Carolina (1)
-
-
South Dakota (6)
-
Southern U.S. (2)
-
Susquehanna River (1)
-
Talladega Front (1)
-
Tennessee
-
Fentress County Tennessee (1)
-
Morgan County Tennessee (1)
-
Scott County Tennessee (1)
-
-
Texas
-
Archer County Texas (1)
-
Balcones fault zone (1)
-
Brewster County Texas
-
Big Bend National Park (1)
-
-
Dallas County Texas
-
Dallas Texas (1)
-
-
Delta County Texas (1)
-
Fort Worth Basin (1)
-
Hopkins County Texas (1)
-
Jack County Texas (1)
-
Midland Basin (1)
-
San Marcos Arch (1)
-
Terrell County Texas (1)
-
Uvalde County Texas (1)
-
Val Verde County Texas (1)
-
West Texas (5)
-
Wise County Texas (1)
-
-
U. S. Rocky Mountains
-
Absaroka Range (1)
-
Bighorn Mountains (2)
-
Bitterroot Range
-
Beaverhead Mountains (1)
-
-
Bridger Range (1)
-
Little Belt Mountains (1)
-
Sangre de Cristo Mountains (1)
-
Spanish Peaks (1)
-
Tendoy Range (1)
-
Tobacco Root Mountains (1)
-
Uinta Mountains (1)
-
Wind River Range (1)
-
-
Uinta Basin (1)
-
Utah
-
Carbon County Utah (1)
-
Emery County Utah (1)
-
Garfield County Utah (1)
-
Grand County Utah (2)
-
Kane County Utah (1)
-
San Juan County Utah (1)
-
San Rafael Swell (2)
-
Summit County Utah
-
Park City Utah (1)
-
-
-
Virginia (3)
-
Wabash Valley (1)
-
Walker Lane (1)
-
Washington
-
Pierce County Washington
-
Mount Rainier (1)
-
-
Skamania County Washington
-
Mount Saint Helens (1)
-
-
-
West Virginia
-
Berkeley County West Virginia (1)
-
Monroe County West Virginia (1)
-
Morgan County West Virginia (1)
-
-
Western U.S. (4)
-
Wiggins Arch (1)
-
Wyoming
-
Big Horn County Wyoming (1)
-
Hanna Basin (1)
-
Laramie Basin (1)
-
Natrona County Wyoming (1)
-
Niobrara County Wyoming (1)
-
Rock Springs Uplift (1)
-
Sweetwater County Wyoming
-
Rock Springs Wyoming (1)
-
-
Wind River Range (1)
-
-
Wyoming Province (2)
-
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USSR (1)
-
White Mountains (1)
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Wind River basin (3)
-
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commodities
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barite deposits (1)
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bitumens
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asphalt (1)
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brines (2)
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coal deposits (1)
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energy sources (8)
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geothermal energy (1)
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industrial minerals (1)
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metal ores
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base metals (1)
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copper ores (11)
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gold ores (24)
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iron ores (1)
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lead ores (5)
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lead-zinc deposits (2)
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mercury ores (1)
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molybdenum ores (3)
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nickel ores (1)
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polymetallic ores (3)
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silver ores (8)
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uranium ores (2)
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zinc ores (6)
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mineral deposits, genesis (26)
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mineral exploration (11)
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mineral resources (1)
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oil and gas fields (26)
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petroleum
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natural gas
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coalbed methane (1)
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shale oil (1)
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tight sands (4)
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water resources (1)
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elements, isotopes
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boron
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B-11/B-10 (1)
-
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carbon
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C-13/C-12 (11)
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C-14 (6)
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organic carbon (3)
-
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halogens
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chlorine
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chloride ion (1)
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fluorine (1)
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hydrogen
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D/H (1)
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isotope ratios (20)
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isotopes
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radioactive isotopes
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Al-26 (2)
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Be-10 (3)
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C-14 (6)
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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stable isotopes
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C-13/C-12 (11)
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D/H (1)
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N-15/N-14 (1)
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O-18/O-16 (10)
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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S-34/S-32 (8)
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Sr-87/Sr-86 (3)
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Lu/Hf (1)
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metals
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alkaline earth metals
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beryllium
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Be-10 (3)
-
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strontium
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Sr-87/Sr-86 (3)
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aluminum
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Al-26 (2)
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iron (1)
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lead
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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mercury (1)
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rare earths (4)
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silver (1)
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zinc (1)
-
-
nitrogen
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N-15/N-14 (1)
-
-
noble gases
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helium (2)
-
radon (1)
-
-
oxygen
-
O-18/O-16 (10)
-
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sulfur
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S-34/S-32 (8)
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-
-
fossils
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borings (1)
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Chordata
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Vertebrata
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Tetrapoda
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Mammalia
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Theria
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Eutheria
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-
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Reptilia
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Diapsida
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Archosauria
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dinosaurs
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Ornithischia
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Ornithopoda
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Hadrosauridae (1)
-
-
-
-
-
-
-
-
-
-
Graptolithina (1)
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Hemichordata (1)
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Invertebrata
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Arthropoda
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Mandibulata
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Crustacea
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Malacostraca
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Brachyura (1)
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Ostracoda (1)
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Trilobitomorpha
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Brachiopoda (1)
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Cnidaria
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Mollusca
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Protista
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Foraminifera (5)
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Vermes
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microfossils
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Conodonta (4)
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palynomorphs
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Plantae
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problematic fossils
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problematic microfossils (1)
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Pterobranchia (1)
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tracks (1)
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geochronology methods
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(U-Th)/He (2)
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Ar/Ar (14)
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infrared stimulated luminescence (2)
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paleomagnetism (7)
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Re/Os (3)
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thermochronology (8)
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U/Pb (28)
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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
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Pleistocene
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Lake Missoula (2)
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Weichselian
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upper Weichselian
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Younger Dryas (1)
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-
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Wisconsinan
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upper Wisconsinan (1)
-
-
-
-
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Tertiary
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Neogene
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Miocene
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Columbia River Basalt Group (4)
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lower Miocene
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Saucesian (1)
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middle Miocene
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Luisian (1)
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Mohnian (1)
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Relizian (1)
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Temblor Formation (1)
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Pliocene (2)
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Paleogene
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Eocene
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Absaroka Supergroup (1)
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lower Eocene
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Willwood Formation (1)
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Wind River Formation (1)
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middle Eocene
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Aycross Formation (1)
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Claiborne Group (1)
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-
upper Eocene
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Tejon Formation (1)
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-
-
Hanna Formation (1)
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lower Paleogene (1)
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Oligocene
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Frio Formation (1)
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middle Oligocene
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Byram Formation (1)
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Marianna Limestone (1)
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-
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Paleocene
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lower Paleocene
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K-T boundary (1)
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Paleocene-Eocene Thermal Maximum (1)
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Renova Formation (1)
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upper Cenozoic (2)
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Laurentide ice sheet (1)
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Mesozoic
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Cretaceous
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Comanchean
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Buda Limestone (1)
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Dakota Formation (2)
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Lower Cretaceous
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Albian (1)
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Bear River Formation (1)
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Burro Canyon Formation (1)
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Cedar Mountain Formation (1)
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Cloverly Formation (1)
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Mannville Group (1)
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Mowry Shale (1)
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Muddy Sandstone (1)
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Skull Creek Shale (1)
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Mancos Shale (1)
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Middle Cretaceous (2)
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Upper Cretaceous
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Almond Formation (1)
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Buda Limestone (1)
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Campanian
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upper Campanian (1)
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Castlegate Sandstone (1)
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Cenomanian (2)
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Colville Group (1)
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Frontier Formation (3)
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Gulfian
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Austin Chalk (1)
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Eagle Ford Formation (2)
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K-T boundary (1)
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Maestrichtian (1)
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Middendorf Formation (1)
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Niobrara Formation (1)
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Pierre Shale (2)
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Senonian (2)
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Turonian (3)
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Two Medicine Formation (1)
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-
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Great Valley Sequence (2)
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Jurassic
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Bonanza Group (1)
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Kingak Shale (1)
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Lower Jurassic
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Nordegg Member (1)
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Middle Jurassic
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Bajocian (1)
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Page Sandstone (1)
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Summerville Formation (1)
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Norphlet Formation (1)
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Twin Creek Limestone (1)
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Upper Jurassic
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Brushy Basin Member (1)
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Buckner Formation (1)
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Entrada Sandstone (1)
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Haynesville Formation (1)
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Morrison Formation (2)
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Oxfordian (2)
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Smackover Formation (2)
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Sundance Formation (1)
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Tithonian (1)
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-
-
Navajo Sandstone (3)
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Triassic
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Lower Triassic
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Bunter (1)
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Middle Triassic
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Doig Formation (1)
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Montney Formation (1)
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Upper Triassic
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Mercia Mudstone (1)
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-
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upper Mesozoic (1)
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Vaca Muerta Formation (1)
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Wingate Sandstone (1)
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Paleozoic
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Cambrian
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Middle Cambrian (1)
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Upper Cambrian
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Goldenville Formation (1)
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-
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Carboniferous
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Big Snowy Group (2)
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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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Leadville Formation (1)
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Lower Mississippian
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Fort Payne Formation (1)
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Lodgepole Formation (1)
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Tournaisian
-
upper Tournaisian (1)
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-
-
Macumber Formation (1)
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Madison Group (3)
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Upper Mississippian
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Meramecian
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Salem Limestone (1)
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-
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Valmeyeran (1)
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Windsor Group (1)
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Pennsylvanian
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Middle Pennsylvanian
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Atokan
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Atoka Formation (1)
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Paradox Formation (1)
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Upper Pennsylvanian (2)
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Upper Carboniferous (1)
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Devonian
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Marcellus Shale (3)
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Popovich Formation (1)
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Upper Devonian
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Duperow Formation (1)
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Frasnian (1)
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-
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Earn Group (1)
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Exshaw Formation (1)
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Hanson Creek Formation (1)
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Horton Group (1)
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lower Paleozoic
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Wilmington Complex (1)
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New Albany Shale (1)
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Ordovician
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Lower Ordovician
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Ellenburger Group (1)
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Middle Ordovician
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Simpson Group (1)
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Permian
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Guadalupian
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Roadian (1)
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Lower Permian
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Cisuralian
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Leman Sandstone Formation (1)
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Lyons Sandstone (1)
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Park City Formation (1)
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Phosphoria Formation (4)
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Upper Permian
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Lopingian (1)
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Sauk Sequence (1)
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Silurian
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Bainbridge Formation (1)
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Lower Silurian
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Tuscarora Formation (1)
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Wenlock (1)
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Middle Silurian
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Roberts Mountains Formation (2)
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-
-
Tensleep Sandstone (1)
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Tippecanoe Sequence (1)
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upper Paleozoic
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Bakken Formation (3)
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Kaskaskia Sequence (1)
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Tirrawarra Sandstone (1)
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-
Wissahickon Formation (1)
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Woodford Shale (1)
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Phanerozoic (5)
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Precambrian
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Archean
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Mesoarchean (2)
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Neoarchean (2)
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Rice Lake Group (1)
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Kisseynew Complex (1)
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Noonday Dolomite (1)
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upper Precambrian
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Proterozoic
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Mesoproterozoic (4)
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Neoproterozoic
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Cryogenian (1)
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Doushantuo Formation (1)
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Ediacaran (2)
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Vendian (1)
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Paleoproterozoic (8)
-
Sinian
-
Doushantuo Formation (1)
-
-
-
-
Vadito Group (1)
-
-
-
igneous rocks
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igneous rocks
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carbonatites (1)
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granophyre (1)
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plutonic rocks
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diabase (1)
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diorites (2)
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gabbros (1)
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granites
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granite porphyry (1)
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granodiorites (4)
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monzodiorite (1)
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syenites (1)
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porphyry (2)
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volcanic rocks
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basalts (3)
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pyroclastics
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ash-flow tuff (1)
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ignimbrite (2)
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tuff (4)
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rhyolites (5)
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-
-
-
metamorphic rocks
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cataclasites (1)
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augen gneiss (1)
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metaigneous rocks
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metasedimentary rocks
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metasomatic rocks
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skarn (3)
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metavolcanic rocks (4)
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schists
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turbidite (6)
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minerals
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carbonates
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calcite (2)
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halides
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minerals (1)
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oxides
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phosphates
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apatite (2)
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monazite (2)
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silicates
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chain silicates
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amphibole group
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clinoamphibole
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hornblende (4)
-
-
-
-
framework silicates
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feldspar group
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alkali feldspar
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adularia (1)
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K-feldspar (2)
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sanidine (1)
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plagioclase (1)
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silica minerals
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quartz (4)
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-
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orthosilicates
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nesosilicates
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garnet group (1)
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staurolite (1)
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zircon group
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zircon (18)
-
-
-
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ring silicates
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tourmaline group (1)
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sheet silicates
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chlorite group
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chlorite (1)
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clay minerals (2)
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illite (2)
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mica group
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sericite (1)
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sulfates
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sulfides
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pyrite (4)
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pyrrhotite (1)
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realgar (1)
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-
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Primary terms
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absolute age (42)
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Africa
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Madagascar
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North Africa
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Southern Africa
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West Africa
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Ghana (2)
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Arctic Ocean
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More Basin (1)
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Arctic region
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Asia
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Far East
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China
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Yangtze Platform (1)
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Pakistan (1)
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associations (1)
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Atlantic Ocean
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South Atlantic
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Australasia
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Australia
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New Zealand
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Otago New Zealand (1)
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barite deposits (1)
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bibliography (5)
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biogeography (1)
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biography (2)
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boron
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brines (2)
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Canada
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carbon
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C-13/C-12 (11)
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organic carbon (3)
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Caribbean region
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catalogs (1)
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Cenozoic
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Quaternary
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Holocene
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Pleistocene
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Lake Missoula (2)
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upper Pleistocene
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Weichselian
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upper Weichselian
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Younger Dryas (1)
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-
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Wisconsinan
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upper Wisconsinan (1)
-
-
-
-
-
Tertiary
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Neogene
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Miocene
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Columbia River Basalt Group (4)
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lower Miocene
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Saucesian (1)
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middle Miocene
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Luisian (1)
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Mohnian (1)
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Relizian (1)
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Temblor Formation (1)
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Pliocene (2)
-
-
Paleogene
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Eocene
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Absaroka Supergroup (1)
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lower Eocene
-
Willwood Formation (1)
-
Wind River Formation (1)
-
-
middle Eocene
-
Aycross Formation (1)
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Claiborne Group (1)
-
-
upper Eocene
-
Tejon Formation (1)
-
-
-
Hanna Formation (1)
-
lower Paleogene (1)
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Oligocene
-
Frio Formation (1)
-
middle Oligocene
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Byram Formation (1)
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Marianna Limestone (1)
-
-
-
Paleocene
-
lower Paleocene
-
K-T boundary (1)
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-
-
Paleocene-Eocene Thermal Maximum (1)
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Renova Formation (1)
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upper Cenozoic (2)
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Chordata
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Vertebrata
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Tetrapoda
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Mammalia
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Theria
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Eutheria
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Perissodactyla (1)
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Tillodontia (1)
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Reptilia
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Diapsida
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Archosauria
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dinosaurs
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Ornithischia
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Ornithopoda
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Hadrosauridae (1)
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coal deposits (1)
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inclusions
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Indian Ocean
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Indian Ocean Islands
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industrial minerals (1)
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intrusions (29)
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Invertebrata
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Mandibulata
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Crustacea
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Brachyura (1)
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Ostracoda (1)
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Trilobitomorpha
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Trilobita (1)
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Brachiopoda (1)
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Cnidaria
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Anthozoa (1)
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Mollusca
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Cephalopoda
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Popovich Formation (1)
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Earn Group (1)
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Exshaw Formation (1)
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New Albany Shale (1)
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Sauk Sequence (1)
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Tensleep Sandstone (1)
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Wissahickon Formation (1)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Big Thompson Anticline
Deformation of basement in basement-involved, compressive structures Available to Purchase
Understanding the kinematic development of basement-involved compressive structures that form at low temperature is dependent, in part, on gaining a better factual understanding of their deformational behavior. Results presented here show that the response of crystalline basement to deformation is incongruous among different structures in Colorado and Wyoming. At Big Thompson anticline and Rattlesnake Mountain anticline, Precambrian basement was not rotated in the anticlinal hinge during Tertiary folding. At both Banner Mountain and at a minor fold on Casper Mountain the basement has been rotated near the anticlinal hinge by as much as 26°. In the steep limb of all four of these monoclinal structures the basement is in fault contact with the stratified cover. At two sites, the Five Springs Creek area of the Bighorn Mountains and Casper Mountain, evidence for greater rotation of basement is clear. Precambrian dikes at Five Springs exhibit rotation of as much as 85° across the Laramide anticlinal hinge. Although the anticline at Casper Mountain shows minor folding, in the footwall a depositional contact on basement is rotated 50° from regional dip. These structures (Big Thompson anticline, Casper Mountain, and Five Springs) show minor fractures in the basement that apparently do not control the kinematics of basement deformation, but do indicate the stress field orientation. Typically σ 1 is nearly horizontal and normal to the fold axis, σ 2 is parallel to the fold axis, and σ 3 is very steep. This is the stress field normally associated with thrust faulting.
Proterozoic metamorphism and deformation in the northern Colorado Front Range Available to Purchase
Abstract Paleoproterozoic supracrustal rocks in the region near Big Thompson Canyon, northern Colorado, have long been recognized as a spectacularly exposed example of regionally zoned metamorphism, preserving an apparently complete sequence from biotite- to migmatite-zones. Due to its location and relatively easy access, the Big Thompson Metamorphic Suite has also provided a valuable field-based educational experience for universities and colleges all along the Front Range and from elsewhere. In addition to a number of other studies, the pioneering work of William Braddock and graduate students from the University of Colorado resulted in more than a dozen M.Sc. and Ph.D. theses from the 1960s to the 1990s. Despite the volume of ground-breaking science conducted on these rocks in the past, there remain a number of fundamental questions regarding the metamorphic history and overall tectonic significance of many of the observable features. Several lines of evidence suggest there is potential for a complex tectonometamorphic history that likely spans from ~1.8 to 1.4 Ga. These include: thermochronologic and geochronologic data supporting multiple thermal and magmatic episodes, structural evidence for multiple deformation events, multiple generations of typical Barrovian minerals (e.g., staurolite), and the widespread occurrence of minerals not commonly associated with a classic Barrovian sequence (e.g., andalusite, cordierite). One purpose of this fieldtrip is to foster new ideas and stimulate new research directions that will utilize the Big Thompson Metamorphic Suite, and the Colorado Rockies in general, as field laboratories for better understanding fundamental orogenic processes.