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NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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East Africa
-
Zambia (1)
-
-
North Africa
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Algeria (1)
-
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Southern Africa
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South Africa
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Transvaal region (1)
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Witwatersrand (1)
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-
-
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Asia
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Arabian Peninsula
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Arabian Shield (1)
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Saudi Arabia (1)
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Central Asia (1)
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Far East
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China
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Xinjiang China
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Junggar Basin (1)
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-
-
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Indian Peninsula
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India (2)
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-
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Atlantic Ocean Islands
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Falkland Islands (1)
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Australasia
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Australia
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Queensland Australia (1)
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Victoria Australia (1)
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Black Hills (2)
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Canada
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Arctic Archipelago (1)
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Eastern Canada
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Maritime Provinces
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Nova Scotia
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Gays River Deposit (1)
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-
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Newfoundland and Labrador
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Newfoundland (1)
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Ontario
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Coldwell Complex (1)
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Hamilton Ontario (1)
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Manitoulin District Ontario
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Manitoulin Island (1)
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Sudbury Basin (3)
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Sudbury igneous complex (1)
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Sudbury Structure (2)
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Thunder Bay District Ontario (1)
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Quebec
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Nunavut (1)
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Queen Elizabeth Islands
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Western Canada
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Commonwealth of Independent States
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Europe
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Germany (2)
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Southern Europe
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Portugal
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Spain
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Italy
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Western Europe
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Belgium (1)
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France
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Aquitaine Basin (1)
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Scandinavia
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Norway
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Ringerike (1)
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Sweden
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Gotland Sweden (1)
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United Kingdom
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Great Britain
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Scotland (2)
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-
-
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Fire Island (1)
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Front Range (1)
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Green Bay (1)
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Gulf of Mexico Basin (1)
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Illinois River (2)
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Lake Nipissing (1)
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Long Island (1)
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Mexico
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Coahuila Mexico (1)
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Sierra Madre Oriental (1)
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North America
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Appalachian Basin (3)
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Appalachians
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Southern Appalachians (1)
-
-
Canadian Shield
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Churchill Province (1)
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Grenville Province (5)
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Southern Province (12)
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Superior Province (5)
-
-
Great Lakes
-
Lake Michigan (12)
-
Lake Superior (8)
-
-
Great Lakes region (57)
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Great Plains
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Northern Great Plains (1)
-
-
Grenville Front (3)
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Gulf Coastal Plain (1)
-
Keweenawan Rift (22)
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Lake Superior region (33)
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Michigan Basin (15)
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Mississippi River basin (1)
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Niagara Escarpment (1)
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North American Craton (1)
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Rocky Mountains
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Northern Rocky Mountains (1)
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U. S. Rocky Mountains
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Absaroka Range (1)
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Uinta Mountains (1)
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Wasatch Range (1)
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Wet Mountains (1)
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Transcontinental Arch (2)
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Western Interior (1)
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Raton Basin (1)
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San Andreas Fault (1)
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South America
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Brazil
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Minas Gerais Brazil
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Quadrilatero Ferrifero (2)
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Rio de Janeiro Brazil (1)
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Falkland Islands (1)
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Guiana Shield (1)
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Surinam (1)
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Venezuela (1)
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United States
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Alabama
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Etowah County Alabama (1)
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Alaska
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Anchorage Alaska (1)
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Medfra Quadrangle (1)
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Anadarko Basin (1)
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Arizona (4)
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Arkansas (12)
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Arkoma Basin (2)
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California
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Northern California (1)
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Southern California (1)
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Cheyenne Belt (1)
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Cincinnati Arch (1)
-
Colorado
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Denver County Colorado
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Denver Colorado (1)
-
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Fremont County Colorado (1)
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Wet Mountains (1)
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White River Plateau (1)
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Colorado Lineament (1)
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Denver Basin (1)
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Eastern U.S.
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Northeastern U.S. (3)
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Southeastern U.S. (4)
-
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Florida
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Florida Keys
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Key Largo (1)
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Monroe County Florida
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Key Largo (1)
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Forest City Basin (1)
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Georgia
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Catoosa County Georgia (1)
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Idaho
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Snake River plain (1)
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Illinois
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Alexander County Illinois (1)
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Christian County Illinois (1)
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Cook County Illinois (3)
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DeKalb County Illinois (1)
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DuPage County Illinois (1)
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Hancock County Illinois (2)
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Jersey County Illinois (1)
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Kane County Illinois (1)
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La Salle County Illinois (2)
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Mason County Illinois (1)
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McHenry County Illinois (1)
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Monroe County Illinois (1)
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Saint Clair County Illinois (1)
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Stephenson County Illinois (2)
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Vermilion County Illinois (1)
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Illinois Basin (11)
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Indiana
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Montgomery County Indiana (1)
-
Parke County Indiana (2)
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Vermillion County Indiana (1)
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Vigo County Indiana (1)
-
-
Iowa
-
Allamakee County Iowa (3)
-
Buchanan County Iowa (1)
-
Cedar County Iowa (1)
-
Cerro Gordo County Iowa (1)
-
Clayton County Iowa (2)
-
Fayette County Iowa (3)
-
Floyd County Iowa (6)
-
Howard County Iowa (1)
-
Humboldt County Iowa (1)
-
Johnson County Iowa (3)
-
Lee County Iowa (1)
-
Linn County Iowa (1)
-
Mahaska County Iowa (1)
-
Pocahontas County Iowa (1)
-
Story County Iowa (1)
-
Winneshiek County Iowa (16)
-
Wright County Iowa (1)
-
-
Kansas
-
Bourbon County Kansas (1)
-
Shawnee County Kansas (1)
-
Wabaunsee County Kansas (1)
-
-
Kentucky
-
Bath County Kentucky (1)
-
Kentucky River Fault (1)
-
Madison County Kentucky (1)
-
-
Maine
-
Hancock County Maine (1)
-
-
Massachusetts
-
Suffolk County Massachusetts
-
Boston Massachusetts (1)
-
-
-
Michigan
-
Michigan Lower Peninsula
-
Emmet County Michigan (1)
-
-
Michigan Upper Peninsula
-
Alger County Michigan (1)
-
Baraga County Michigan (6)
-
Chippewa County Michigan (1)
-
Delta County Michigan (3)
-
Dickinson County Michigan (4)
-
Gogebic County Michigan (14)
-
Houghton County Michigan (3)
-
Iron County Michigan (4)
-
Keweenaw County Michigan (3)
-
Keweenaw Peninsula (7)
-
Marquette County Michigan
-
Marquette Michigan (4)
-
Marquette Range (4)
-
-
Menominee County Michigan (3)
-
Ontonagon County Michigan
-
White Pine Michigan (14)
-
-
Schoolcraft County Michigan (1)
-
-
-
Midcontinent (32)
-
Midcontinent geophysical anomaly (1)
-
Midwest (180)
-
Minnesota
-
Aitkin County Minnesota (1)
-
Anoka County Minnesota (2)
-
Carlton County Minnesota (5)
-
Chisago County Minnesota (3)
-
Cook County Minnesota (1)
-
Dakota County Minnesota (3)
-
Duluth Complex (2)
-
Fillmore County Minnesota (13)
-
Goodhue County Minnesota (5)
-
Hennepin County Minnesota (1)
-
Houston County Minnesota (2)
-
Itasca County Minnesota (1)
-
Kanabec County Minnesota (1)
-
Mesabi Range (2)
-
Minnesota River valley (1)
-
Mower County Minnesota (2)
-
Olmsted County Minnesota (1)
-
Pine County Minnesota (3)
-
Ramsey County Minnesota
-
Saint Paul Minnesota (1)
-
-
Saint Louis County Minnesota
-
Duluth Minnesota (6)
-
-
Wabasha County Minnesota (1)
-
Washington County Minnesota (2)
-
Winona County Minnesota (2)
-
-
Mississippi (1)
-
Mississippi Embayment (5)
-
Mississippi River (2)
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Mississippi Valley
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Upper Mississippi Valley (36)
-
-
Missouri
-
Cooper County Missouri (2)
-
Howard County Missouri (1)
-
Lewis County Missouri (1)
-
Lincoln County Missouri (1)
-
Saint Francois Mountains (1)
-
Saint Louis County Missouri
-
Saint Louis Missouri (1)
-
-
Sainte Genevieve County Missouri (1)
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Viburnum Trend (2)
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Mojave Desert (1)
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Montana (2)
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Nebraska (15)
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Nevada (3)
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New England (2)
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New Hampshire (1)
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New Jersey (1)
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New Madrid region (14)
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New Mexico (2)
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New York
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Monroe County New York (1)
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Niagara County New York (2)
-
-
North Carolina (1)
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North Dakota
-
Cass County North Dakota (1)
-
-
Ohio
-
Muskingum County Ohio (1)
-
Perry County Ohio (1)
-
Ross County Ohio (1)
-
-
Ohio River (1)
-
Ohio River valley (3)
-
Oklahoma
-
Le Flore County Oklahoma (1)
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Meers Fault (3)
-
Pontotoc County Oklahoma (1)
-
-
Oregon (2)
-
Ozark Mountains (1)
-
Pennsylvania (2)
-
Reelfoot Rift (1)
-
Shenandoah Valley (1)
-
South Carolina
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Charleston County South Carolina
-
Charleston South Carolina (1)
-
-
-
South Dakota (3)
-
South Platte River valley (1)
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Southern U.S. (4)
-
Southwestern U.S. (2)
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Tennessee (12)
-
Texas
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Amarillo Uplift (1)
-
Burnet County Texas (1)
-
Hartley County Texas (1)
-
Lubbock County Texas (1)
-
Moore County Texas (1)
-
Potter County Texas (1)
-
-
U. S. Rocky Mountains
-
Absaroka Range (1)
-
Uinta Mountains (1)
-
Wasatch Range (1)
-
Wet Mountains (1)
-
-
Utah
-
Millard County Utah
-
House Range (1)
-
-
-
Virginia (8)
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Wabash Valley (3)
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Washington (3)
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West Virginia (2)
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Western U.S. (5)
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Wisconsin
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Adams County Wisconsin (1)
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Ashland County Wisconsin (6)
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Barron County Wisconsin (1)
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Bayfield County Wisconsin (5)
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Brown County Wisconsin (3)
-
Burnett County Wisconsin (1)
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Calumet County Wisconsin (3)
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Chippewa County Wisconsin (3)
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Clark County Wisconsin (4)
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Columbia County Wisconsin (3)
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Crawford County Wisconsin (2)
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Dane County Wisconsin
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Lake Mendota (3)
-
Madison Wisconsin (2)
-
-
Dodge County Wisconsin (1)
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Door County Wisconsin (4)
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Door Peninsula (2)
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Douglas County Wisconsin (2)
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Dunn County Wisconsin (1)
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Eau Claire County Wisconsin (5)
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Florence County Wisconsin (5)
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Fond du Lac County Wisconsin (2)
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Forest County Wisconsin (3)
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Grant County Wisconsin (8)
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Green Lake County Wisconsin (1)
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Iron County Wisconsin (4)
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Jackson County Wisconsin (3)
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Juneau County Wisconsin (1)
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Kenosha County Wisconsin (2)
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Kewaunee County Wisconsin (2)
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La Crosse County Wisconsin (1)
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Lafayette County Wisconsin (5)
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Langlade County Wisconsin (2)
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Lincoln County Wisconsin (2)
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Manitowoc County Wisconsin (6)
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Marathon County Wisconsin (10)
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Marinette County Wisconsin (4)
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Marquette County Wisconsin (2)
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Menominee County Wisconsin (3)
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Milwaukee County Wisconsin
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Milwaukee Wisconsin (10)
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Oconto County Wisconsin (1)
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Oneida County Wisconsin (1)
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Outagamie County Wisconsin (1)
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Pierce County Wisconsin (5)
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Polk County Wisconsin (3)
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Portage County Wisconsin (5)
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Racine County Wisconsin (3)
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Rock County Wisconsin (2)
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Sauk County Wisconsin
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Baraboo Wisconsin (11)
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Sawyer County Wisconsin (2)
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Shawano County Wisconsin (3)
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Taylor County Wisconsin (2)
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Trempealeau County Wisconsin (6)
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Vernon County Wisconsin (1)
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Walworth County Wisconsin (2)
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Waukesha County Wisconsin (10)
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Waupaca County Wisconsin (1)
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Winnebago County Wisconsin (2)
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Wisconsin River (2)
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Wolf River Batholith (3)
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Wood County Wisconsin (4)
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Wyoming
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Laramie Basin (1)
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Wyoming Province (1)
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Yavapai Province (1)
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Yellowstone National Park (1)
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Walnut Creek (1)
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White Pine Mine (16)
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commodities
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aggregate (1)
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bitumens (2)
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brines (8)
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construction materials (2)
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energy sources (10)
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gems (1)
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geothermal energy (1)
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industrial minerals (3)
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limestone deposits (1)
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metal ores
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base metals (6)
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cadmium ores (1)
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copper ores (26)
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gold ores (4)
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iron ores (14)
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lead ores (7)
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lead-zinc deposits (14)
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manganese ores (1)
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molybdenum ores (2)
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nickel ores (3)
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platinum ores (2)
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polymetallic ores (3)
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pyrite ores (2)
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silver ores (1)
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tungsten ores (1)
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uranium ores (2)
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vanadium ores (1)
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zinc ores (7)
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mineral deposits, genesis (66)
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mineral exploration (11)
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mineral resources (1)
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oil and gas fields (5)
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petroleum
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natural gas
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sandstone deposits (1)
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talc deposits (1)
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water resources (3)
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elements, isotopes
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carbon
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C-13 (1)
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C-13/C-12 (7)
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C-14 (15)
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chemical ratios (3)
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halogens
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bromine
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fluorine (1)
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iodine (1)
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hydrogen
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D/H (5)
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deuterium (4)
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isotope ratios (22)
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isotopes
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radioactive isotopes
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Al-26 (1)
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Be-10 (3)
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C-14 (15)
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Pb-206/Pb-204 (2)
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Pb-207/Pb-204 (2)
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Pb-208/Pb-204 (2)
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stable isotopes
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C-13 (1)
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C-13/C-12 (7)
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D/H (5)
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deuterium (4)
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Nd-144/Nd-143 (5)
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O-18 (1)
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O-18/O-16 (14)
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Os-188/Os-187 (1)
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Pb-206/Pb-204 (2)
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Pb-207/Pb-204 (2)
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Pb-208/Pb-204 (2)
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S-34 (1)
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S-34/S-32 (10)
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Sr-87/Sr-86 (1)
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metals
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actinides
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thorium (1)
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uranium (1)
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alkali metals
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potassium (3)
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sodium (2)
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alkaline earth metals
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barium (1)
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beryllium
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Be-10 (3)
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calcium (1)
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magnesium (1)
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strontium
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Sr-87/Sr-86 (1)
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aluminum
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Al-26 (1)
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arsenic (1)
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chromium (1)
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copper (17)
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hafnium (1)
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iron (13)
-
lead
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Pb-206/Pb-204 (2)
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Pb-207/Pb-204 (2)
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Pb-208/Pb-204 (2)
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manganese (1)
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mercury (3)
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molybdenum (3)
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niobium (2)
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platinum group
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iridium (1)
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osmium
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Os-188/Os-187 (1)
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platinum ores (2)
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rhodium (1)
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precious metals (1)
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rare earths
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cerium (1)
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neodymium
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Nd-144/Nd-143 (5)
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samarium (1)
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yttrium (1)
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tantalum (1)
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zinc (16)
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nitrogen (1)
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oxygen
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phosphorus (1)
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selenium (1)
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sulfur
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S-34/S-32 (10)
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Tetrapoda
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Mammalia
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Theria
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Proboscidea
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Elephantidae
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Mammuthus primigenius (1)
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Rodentia (1)
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Thelodonti (1)
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coprolites (2)
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eukaryotes (1)
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Insecta
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Trilobitomorpha
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Brachiopoda
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Inarticulata (2)
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Cnidaria
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Scyphozoa
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Conulariida (3)
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Echinodermata
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Crinozoa
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Crinoidea
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Inadunata (1)
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Homalozoa
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Homoiostelea (1)
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Stylophora (1)
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Mollusca
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Bivalvia
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Cyrtodontida (1)
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Cephalopoda
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Ammonoidea
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Goniatitida
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Goniatitidae
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Goniatites (1)
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Nautiloidea (1)
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Gastropoda
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Archaeogastropoda (5)
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Monoplacophora (1)
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Porifera
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Protista
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Vermes
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microfossils
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Conodonta
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palynomorphs
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miospores
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pollen (2)
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Plantae
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algae
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calcareous algae (1)
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Chlorophyta
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Chlorophyceae
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Dasycladaceae (3)
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diatoms (1)
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Bryophyta
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Musci
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Spermatophyta
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Angiospermae
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Dicotyledoneae
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Betula (1)
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Ulmus (1)
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Gymnospermae
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Coniferales
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Tsuga (1)
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problematic fossils (8)
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thallophytes (4)
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tracks (2)
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geochronology methods
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geologic age
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Cenozoic
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Quaternary
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Pleistocene
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upper Pleistocene
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upper Weichselian
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Wisconsinan
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-
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upper Quaternary
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Brunhes Chron (1)
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Tertiary
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Paleogene
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Eocene
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Absaroka Supergroup (1)
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-
-
-
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Lake Bonneville (1)
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Laurentide ice sheet (12)
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Mesozoic
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Cretaceous
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Dakota Formation (2)
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Jurassic
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Middle Jurassic
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Xishanyao Formation (1)
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Navajo Sandstone (1)
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Triassic (1)
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MIS 3 (1)
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Paleozoic
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Bedford Shale (1)
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Cambrian
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Marjum Formation (1)
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Upper Cambrian
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Bonneterre Formation (1)
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Eau Claire Formation (5)
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Franconia Formation (3)
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Galesville Sandstone (6)
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Mount Simon Sandstone (8)
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Potsdam Sandstone (3)
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Steptoean (1)
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Wonewoc Formation (3)
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-
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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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Borden Group (2)
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Harrodsburg Limestone (1)
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Lower Mississippian
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Cuyahoga Formation (1)
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Fort Payne Formation (2)
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Osagian
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Burlington Limestone (6)
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Keokuk Limestone (7)
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Middle Mississippian (2)
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Ramp Creek Formation (1)
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Upper Mississippian
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Chesterian
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Golconda Formation (1)
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Meramecian
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Saint Louis Limestone (2)
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Sainte Genevieve Limestone (1)
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Salem Limestone (2)
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Warsaw Formation (5)
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-
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Valmeyeran (1)
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Pennsylvanian
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Excello Shale (1)
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Lower Pennsylvanian
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Caseyville Formation (1)
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Morrowan (2)
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Middle Pennsylvanian
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Atokan (2)
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Carbondale Formation (1)
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Desmoinesian
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Cabaniss Formation (1)
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Cherokee Group (1)
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Dugger Formation (1)
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Kanawha Formation (1)
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Staunton Formation (2)
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Upper Pennsylvanian
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Canyon Group (1)
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Cisco Group (1)
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Kasimovian (1)
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Missourian
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Kansas City Group (2)
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Lansing Group (1)
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Virgilian
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Wabaunsee Group (1)
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-
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Upper Carboniferous (1)
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Devonian
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Lower Devonian
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Emsian (1)
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Middle Devonian
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Cedar Valley Formation (3)
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Eifelian (1)
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Hamilton Group (1)
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Sylvania Formation (1)
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Traverse Group (1)
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Upper Devonian
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Frasnian (4)
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Lime Creek Formation (4)
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Knox Group (1)
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lower Paleozoic
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Cape Phillips Formation (1)
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Minnelusa Formation (1)
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Ordovician
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Lower Ordovician
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Ibexian (1)
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Oneota Dolomite (2)
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Prairie du Chien Group (3)
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Shakopee Formation (3)
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Middle Ordovician
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Blackriverian (2)
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Darriwilian (1)
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Decorah Shale (10)
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Deicke Bentonite Bed (1)
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Galena Dolomite (15)
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Glenwood Shale (1)
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Platteville Formation (17)
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Saint Peter Sandstone (14)
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Simpson Group (1)
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Whiterockian (1)
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Trenton Group (2)
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Upper Ordovician
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Ashgillian (1)
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Cincinnatian
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Richmondian (1)
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Fernvale Formation (1)
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Katian (3)
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Maquoketa Formation (7)
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Mohawkian (1)
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Neda Formation (1)
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Queenston Shale (1)
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Sandbian (1)
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Trentonian (3)
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Permian
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Council Grove Group (1)
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Lower Permian
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Cisuralian
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Asselian (1)
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Wolfcampian (2)
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Sauk Sequence (1)
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Silurian
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Lockport Formation (2)
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Lower Silurian
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Alexandrian (1)
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Brassfield Formation (1)
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Llandovery
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Telychian (1)
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Wenlock (10)
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Middle Silurian
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Clinton Group (1)
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Racine Dolomite (10)
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Waldron Shale (2)
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Niagaran (13)
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Upper Silurian
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Ludlow (4)
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upper Paleozoic
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Admire Group (1)
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Antrim Shale (1)
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Weber Sandstone (1)
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Phanerozoic (2)
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Precambrian
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Animikie Group (3)
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Biwabik Iron Formation (2)
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middle Precambrian (2)
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Uinta Mountain Group (1)
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upper Precambrian
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Proterozoic
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Algonkian
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Baraboo Quartzite (10)
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Baraga Group (4)
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Huronian
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Onaping Formation (1)
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Keweenawan
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Copper Harbor Conglomerate (7)
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Portage Lake Lava Series (3)
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Mesoproterozoic
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Belt Supergroup (1)
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Freda Sandstone (4)
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Stenian (3)
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Negaunee Iron Formation (5)
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Neoproterozoic (8)
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Oronto Group (8)
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Paleoproterozoic
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Hemlock Formation (2)
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Marquette Range Supergroup (4)
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Michigamme Formation (4)
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Thomson Formation (2)
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Virginia Formation (1)
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Witwatersrand Supergroup (1)
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igneous rocks
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extrusive rocks (1)
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tonalite (5)
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trondhjemite (1)
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gabbros
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troctolite (2)
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granites
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A-type granites (2)
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granodiorites (1)
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lamprophyres (1)
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ultramafics
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peridotites (2)
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porphyry (2)
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volcanic rocks
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basalts
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flood basalts (1)
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dacites (1)
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pyroclastics
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tuff (2)
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rhyodacites (1)
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rhyolites
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quartz porphyry (1)
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metamorphic rocks
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metaplutonic rocks (1)
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slates (3)
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meteorites
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pallasite
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minerals
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alloys (1)
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carbonates
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halides
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fluorides
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K-bentonite (1)
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minerals (16)
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native elements
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diamond (1)
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pitchblende (1)
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rutile (2)
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phosphates
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amphibole group
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clinoamphibole
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riebeckite (1)
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pyroxene group
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clinopyroxene (1)
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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 (7)
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plagioclase
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silica minerals
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amethyst (1)
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orthosilicates
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nesosilicates
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garnet group (1)
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olivine (1)
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phenakite group
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phenakite (1)
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zircon group
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thorite (1)
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zircon (28)
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sorosilicates
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epidote group
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melilite group (1)
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ring silicates
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tourmaline group
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sheet silicates
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chlorite group
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chlorite (3)
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clay minerals
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illite (9)
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mica group
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phlogopite (1)
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pyrophyllite (1)
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talc (1)
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sulfates
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sulfides
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tellurides
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altaite (1)
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hessite (1)
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Primary terms
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absolute age (68)
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Africa
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Asia
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Indian Peninsula
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Quebec
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carbon
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catalogs (4)
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Cenozoic
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Quaternary
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Pleistocene
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Lake Agassiz (4)
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middle Pleistocene (1)
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Peoria Loess (3)
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Roxana Silt (2)
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upper Pleistocene
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Twocreekan (3)
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Weichselian
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upper Weichselian
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Younger Dryas (3)
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-
-
Wisconsinan
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middle Wisconsinan (1)
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upper Wisconsinan (5)
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Woodfordian (3)
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-
-
-
upper Quaternary
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Brunhes Chron (1)
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-
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Tertiary
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Paleogene
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Eocene
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Absaroka Supergroup (1)
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chemical analysis (1)
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Chordata
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Vertebrata
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Agnatha
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Ostracodermi (1)
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Pisces
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Tetrapoda
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Mammalia
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Proboscidea
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Elephantidae
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Mammuthus
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Mammuthus primigenius (1)
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Rodentia (1)
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Thelodonti (1)
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porphyry (2)
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Invertebrata
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Chelicerata
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Mandibulata
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Insecta
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Pterygota
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Trilobitomorpha
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Trilobita
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Phacopida (2)
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Brachiopoda
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Articulata
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Inarticulata (2)
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Bryozoa
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Cnidaria
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Tabulata (1)
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Scyphozoa
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Conulariida (3)
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Echinodermata
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Asterozoa
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Stelleroidea
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Asteroidea (1)
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Crinozoa
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Blastoidea (1)
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Crinoidea
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Inadunata (1)
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Homalozoa
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Homoiostelea (1)
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Stylophora (1)
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Mollusca
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Bivalvia
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Cyrtodontida (1)
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Cephalopoda
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Ammonoidea
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Goniatitida
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Goniatitidae
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Goniatites (1)
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Nautiloidea (1)
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Gastropoda
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Archaeogastropoda (5)
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Monoplacophora (1)
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Porifera
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Stromatoporoidea (2)
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Protista
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Vermes
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isostasy (2)
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stable isotopes
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C-13 (1)
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D/H (5)
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Nd-144/Nd-143 (5)
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Os-188/Os-187 (1)
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Pb-206/Pb-204 (2)
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Pb-207/Pb-204 (2)
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Pb-208/Pb-204 (2)
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S-34 (1)
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S-34/S-32 (10)
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Sr-87/Sr-86 (1)
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land subsidence (1)
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magmas (16)
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mantle (4)
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maps (13)
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marine geology (1)
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Mesozoic
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Cretaceous
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Dakota Formation (2)
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Jurassic
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Middle Jurassic
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Xishanyao Formation (1)
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Navajo Sandstone (1)
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Be-10 (3)
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calcium (1)
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strontium
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Sr-87/Sr-86 (1)
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aluminum
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Al-26 (1)
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arsenic (1)
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copper (17)
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iron (13)
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lead
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Pb-206/Pb-204 (2)
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Pb-208/Pb-204 (2)
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manganese (1)
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Os-188/Os-187 (1)
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precious metals (1)
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cerium (1)
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neodymium
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Nd-144/Nd-143 (5)
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phyllites (1)
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metamorphism (34)
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Mexico
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mineral deposits, genesis (66)
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North America
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Canadian Shield
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Great Lakes
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Great Lakes region (57)
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oxygen
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O-18/O-16 (14)
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Paleozoic
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Bedford Shale (1)
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Berea Sandstone (1)
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Cambrian
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Middle Cambrian
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Marjum Formation (1)
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Upper Cambrian
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Bonneterre Formation (1)
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Eau Claire Formation (5)
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Franconia Formation (3)
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Galesville Sandstone (6)
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Mount Simon Sandstone (8)
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Potsdam Sandstone (3)
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Steptoean (1)
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Wonewoc Formation (3)
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Carboniferous
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Lower Carboniferous
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Dinantian (1)
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Mississippian
-
Borden Group (2)
-
Harrodsburg Limestone (1)
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Lower Mississippian
-
Cuyahoga Formation (1)
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Fort Payne Formation (2)
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Osagian
-
Burlington Limestone (6)
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Keokuk Limestone (7)
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-
-
Middle Mississippian (2)
-
Ramp Creek Formation (1)
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Upper Mississippian
-
Chesterian
-
Golconda Formation (1)
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-
Meramecian
-
Saint Louis Limestone (2)
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Sainte Genevieve Limestone (1)
-
Salem Limestone (2)
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Warsaw Formation (5)
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-
-
Valmeyeran (1)
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-
Pennsylvanian
-
Excello Shale (1)
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Lower Pennsylvanian
-
Caseyville Formation (1)
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Morrowan (2)
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-
Middle Pennsylvanian
-
Atokan (2)
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Carbondale Formation (1)
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-
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