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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
-
Africa
-
Nile Valley (2)
-
-
Arctic region
-
Greenland (1)
-
-
Asia
-
Brahmaputra River (2)
-
Far East
-
China (1)
-
-
-
Atlantic Ocean
-
North Atlantic
-
North Sea (1)
-
-
-
Cache Valley (2)
-
Canada
-
Eastern Canada
-
Maritime Provinces
-
Nova Scotia
-
Gays River Deposit (1)
-
-
-
Ontario (1)
-
-
Western Canada
-
Alberta (1)
-
Manitoba
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Lake Winnipeg (1)
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Nelson River (1)
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-
-
-
Europe
-
Baltic region
-
Estonia (1)
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-
Rhine Basin (1)
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Rhine River (1)
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Western Europe
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Meuse River (1)
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Netherlands
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Limburg Netherlands (1)
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Fraser River (1)
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Illinois River (1)
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Mexico
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Zacatecas Mexico (1)
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North America
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Appalachians
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Blue Ridge Province (1)
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Southern Appalachians (2)
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Valley and Ridge Province (1)
-
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Basin and Range Province (2)
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Great Lakes region (2)
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Great Plains
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Northern Great Plains (1)
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Gulf Coastal Plain (7)
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Michigan Basin (1)
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Mississippi River basin (2)
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North American Cordillera (1)
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Rocky Mountains
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U. S. Rocky Mountains
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Uinta Mountains (1)
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Wasatch Range (1)
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-
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Transcontinental Arch (2)
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Red River (1)
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Rome Trough (1)
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South America
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Argentina (1)
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United States
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Alabama
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Etowah County Alabama (1)
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Arizona (1)
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Arkansas
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Ashley County Arkansas (1)
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Bradley County Arkansas (1)
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Chicot County Arkansas (1)
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Craighead County Arkansas (1)
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Crittenden County Arkansas (2)
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Izard County Arkansas (1)
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Marion County Arkansas (1)
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Mississippi County Arkansas (5)
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Newton County Arkansas (1)
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Phillips County Arkansas (1)
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Poinsett County Arkansas (2)
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Arkansas River (1)
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Arkoma Basin (3)
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Atlantic Coastal Plain
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Southern Atlantic Coastal Plain (1)
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Black Warrior Basin (1)
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California (1)
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Cincinnati Arch (1)
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Colorado
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White River Plateau (1)
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Colorado Plateau (1)
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Eastern U.S.
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Southeastern U.S. (1)
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Illinois
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Adams County Illinois (1)
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Alexander County Illinois (3)
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Calhoun County Illinois (1)
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Hardin County Illinois (1)
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Jackson County Illinois (1)
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Johnson County Illinois (2)
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Massac County Illinois (2)
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Pulaski County Illinois (2)
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Stephenson County Illinois (1)
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Union County Illinois (2)
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Illinois Basin (6)
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Indiana (5)
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Iowa
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Lee County Iowa (1)
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Kansas (3)
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Kentucky
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Ballard County Kentucky (1)
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McCracken County Kentucky (1)
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Rough Creek fault zone (1)
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Louisiana
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Avoyelles Parish Louisiana (1)
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Concordia Parish Louisiana (2)
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Morehouse Parish Louisiana (1)
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Michigan (1)
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Midcontinent (16)
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Midwest (13)
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Minnesota
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Dakota County Minnesota (2)
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Fillmore County Minnesota (2)
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Goodhue County Minnesota (2)
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Hennepin County Minnesota
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Minneapolis Minnesota (2)
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-
Houston County Minnesota (1)
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Minnesota River valley (1)
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Ramsey County Minnesota
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Saint Paul Minnesota (1)
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-
Wabasha County Minnesota (1)
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Winona County Minnesota (2)
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Mississippi
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DeSoto County Mississippi (1)
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Marshall County Mississippi (1)
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Panola County Mississippi (2)
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Tate County Mississippi (1)
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Tunica County Mississippi (1)
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Warren County Mississippi (1)
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Washington County Mississippi (1)
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Mississippi Delta (1)
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Mississippi Embayment (22)
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Mississippi River (19)
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Mississippi Valley
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Lower Mississippi Valley (23)
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Upper Mississippi Valley (73)
-
-
Missouri
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Bollinger County Missouri (1)
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Butler County Missouri (2)
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Cape Girardeau County Missouri (2)
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Carter County Missouri (1)
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Dunklin County Missouri (2)
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Iron County Missouri (2)
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Jasper County Missouri (1)
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Jefferson County Missouri (1)
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Madison County Missouri (2)
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New Madrid County Missouri
-
New Madrid Missouri (2)
-
-
Ozark County Missouri (1)
-
Pemiscot County Missouri (4)
-
Perry County Missouri (1)
-
Pike County Missouri (1)
-
Reynolds County Missouri (2)
-
Ripley County Missouri (1)
-
Saint Francois County Missouri (2)
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Saint Francois Mountains (1)
-
Saint Louis County Missouri
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Saint Louis Missouri (1)
-
-
Stoddard County Missouri (1)
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Viburnum Trend (3)
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Washington County Missouri (2)
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Wayne County Missouri (1)
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Montana (1)
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Nebraska (3)
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New England (1)
-
New Madrid region (45)
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New Mexico (1)
-
Ohio
-
Portage County Ohio (1)
-
-
Ohio River (3)
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Ohio River valley (2)
-
Oklahoma (4)
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Ouachita Belt (1)
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Ouachita Mountains (2)
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Ozark Mountains (2)
-
Pennsylvania (1)
-
Reelfoot Rift (15)
-
South Carolina
-
Charleston County South Carolina
-
Charleston South Carolina (1)
-
-
-
Tennessee
-
Lake County Tennessee (3)
-
Obion County Tennessee (1)
-
Reelfoot Lake (2)
-
Shelby County Tennessee
-
Memphis Tennessee (4)
-
-
Tipton County Tennessee (1)
-
-
Tennessee River (1)
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Texas (1)
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U. S. Rocky Mountains
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Uinta Mountains (1)
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Wasatch Range (1)
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-
Utah (2)
-
Virginia (3)
-
Wisconsin
-
Dane County Wisconsin
-
Madison Wisconsin (1)
-
-
Florence County Wisconsin (1)
-
Grant County Wisconsin (2)
-
Lafayette County Wisconsin (4)
-
Langlade County Wisconsin (1)
-
Lincoln County Wisconsin (1)
-
Marinette County Wisconsin (1)
-
Oneida County Wisconsin (1)
-
Price County Wisconsin (1)
-
Rusk County Wisconsin (1)
-
Sauk County Wisconsin (1)
-
Sawyer County Wisconsin (1)
-
Trempealeau County Wisconsin (2)
-
-
Wyoming (1)
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-
-
commodities
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barite deposits (4)
-
bentonite deposits (2)
-
brines (5)
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energy sources (1)
-
metal ores
-
base metals (5)
-
copper ores (2)
-
lead ores (15)
-
lead-zinc deposits (21)
-
polymetallic ores (1)
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silver ores (1)
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zinc ores (11)
-
-
mineral deposits, genesis (43)
-
mineral exploration (2)
-
mineral resources (3)
-
oil and gas fields (1)
-
petroleum
-
natural gas (5)
-
-
water resources (1)
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (8)
-
C-14 (13)
-
-
chemical ratios (1)
-
halogens
-
bromine (1)
-
chlorine
-
chloride ion (1)
-
-
-
hydrogen
-
D/H (1)
-
deuterium (1)
-
-
isotope ratios (9)
-
isotopes
-
radioactive isotopes
-
Be-10 (1)
-
C-14 (13)
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
-
stable isotopes
-
C-13/C-12 (8)
-
D/H (1)
-
deuterium (1)
-
He-3 (1)
-
Nd-144/Nd-143 (1)
-
O-18/O-16 (5)
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
S-34 (1)
-
S-34/S-32 (3)
-
Sr-87/Sr-86 (4)
-
-
-
metals
-
alkali metals
-
potassium (2)
-
sodium (1)
-
-
alkaline earth metals
-
barium (1)
-
beryllium
-
Be-10 (1)
-
-
calcium (1)
-
magnesium (1)
-
strontium
-
Sr-87/Sr-86 (4)
-
-
-
cadmium (1)
-
copper (2)
-
lead
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
-
manganese (1)
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
-
zinc (18)
-
-
nitrogen (2)
-
noble gases
-
helium
-
He-3 (1)
-
-
-
nonmetals (1)
-
oxygen
-
O-18/O-16 (5)
-
-
phosphorus (1)
-
sulfur
-
organic sulfur (1)
-
S-34 (1)
-
S-34/S-32 (3)
-
-
trace metals (1)
-
-
fossils
-
burrows (2)
-
Chordata
-
Vertebrata
-
Tetrapoda
-
Mammalia
-
Theria
-
Eutheria
-
Proboscidea
-
Mastodontoidea (1)
-
-
-
-
-
-
-
-
cyanobacteria (1)
-
Graptolithina
-
Graptoloidea (1)
-
-
ichnofossils (1)
-
Invertebrata
-
Arthropoda
-
Mandibulata
-
Crustacea
-
Ostracoda (1)
-
-
-
Trilobitomorpha
-
Trilobita
-
Ptychopariida
-
Proetidae (1)
-
-
-
-
-
Brachiopoda (5)
-
Cnidaria
-
Anthozoa (1)
-
Scyphozoa
-
Conulariida (1)
-
-
-
Echinodermata
-
Crinozoa
-
Blastoidea (3)
-
Crinoidea (3)
-
-
Homalozoa
-
Stylophora (1)
-
-
-
Mollusca
-
Cephalopoda (1)
-
Gastropoda
-
Archaeogastropoda (1)
-
-
-
Protista
-
Foraminifera
-
Fusulinina
-
Endothyra (1)
-
-
-
-
-
microfossils
-
Conodonta (5)
-
Fusulinina
-
Endothyra (1)
-
-
-
palynomorphs
-
miospores
-
pollen (1)
-
-
-
Plantae
-
algae
-
Chlorophyta
-
Chlorophyceae
-
Receptaculitaceae (1)
-
-
-
-
-
problematic fossils (1)
-
thallophytes (1)
-
-
geochronology methods
-
K/Ar (1)
-
optically stimulated luminescence (4)
-
paleomagnetism (3)
-
Pb/Pb (1)
-
racemization (3)
-
Rb/Sr (1)
-
tephrochronology (2)
-
thermoluminescence (3)
-
U/Pb (3)
-
U/Th/Pb (1)
-
uranium disequilibrium (1)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Holocene
-
lower Holocene (1)
-
upper Holocene (9)
-
-
Pleistocene
-
Illinoian (1)
-
Loveland Loess (2)
-
Peoria Loess (7)
-
Roxana Silt (5)
-
upper Pleistocene
-
Sangamonian (1)
-
Wisconsinan
-
middle Wisconsinan (1)
-
upper Wisconsinan (6)
-
-
-
Wedron Formation (2)
-
-
upper Quaternary (5)
-
-
Tertiary
-
Neogene
-
Miocene
-
upper Miocene
-
Messinian (2)
-
-
-
Pliocene
-
upper Pliocene (1)
-
-
-
Paleogene
-
Eocene
-
Absaroka Supergroup (1)
-
-
Paleocene
-
lower Paleocene
-
K-T boundary (1)
-
-
-
-
-
-
Laurentide ice sheet (3)
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous
-
Aptian (1)
-
McMurray Formation (1)
-
-
Upper Cretaceous
-
K-T boundary (1)
-
-
-
Jurassic (1)
-
Navajo Sandstone (1)
-
-
MIS 5 (1)
-
MIS 7 (1)
-
Paleozoic
-
Cambrian
-
Lower Cambrian (1)
-
Upper Cambrian
-
Bonneterre Formation (3)
-
Eau Claire Formation (1)
-
Galesville Sandstone (1)
-
Lamotte Sandstone (2)
-
Mount Simon Sandstone (1)
-
Wonewoc Formation (2)
-
-
-
Carboniferous
-
Mississippian
-
Lower Mississippian
-
Osagian
-
Burlington Limestone (1)
-
Keokuk Limestone (3)
-
-
-
Redwall Limestone (1)
-
Upper Mississippian
-
Chesterian
-
Renault Formation (1)
-
-
Meramecian
-
Warsaw Formation (2)
-
-
Pride Mountain Formation (1)
-
-
-
Pennsylvanian
-
Middle Pennsylvanian (1)
-
Upper Pennsylvanian (1)
-
-
-
Devonian
-
Lower Devonian (1)
-
-
lower Paleozoic (3)
-
Ordovician
-
Lower Ordovician
-
Oneota Dolomite (1)
-
Prairie du Chien Group (1)
-
-
Middle Ordovician
-
Blackriverian (1)
-
Champlainian (4)
-
Decorah Shale (5)
-
Deicke Bentonite Bed (3)
-
Everton Formation (1)
-
Galena Dolomite (7)
-
Glenwood Shale (1)
-
Millbrig Bentonite Bed (3)
-
Platteville Formation (6)
-
Saint Peter Sandstone (3)
-
Stones River Group (1)
-
-
Upper Ordovician
-
Ashgillian (1)
-
Hirnantian (1)
-
Katian (1)
-
Maquoketa Formation (2)
-
Mohawkian (1)
-
Sandbian (1)
-
Trentonian (1)
-
-
-
Permian
-
Lower Permian (1)
-
-
Sauk Sequence (2)
-
Silurian
-
Lower Silurian
-
Alexandrian (1)
-
-
-
upper Paleozoic (1)
-
Weber Sandstone (1)
-
-
Phanerozoic (1)
-
Precambrian
-
Nonesuch Shale (1)
-
upper Precambrian
-
Proterozoic
-
Neoproterozoic (4)
-
Paleoproterozoic (1)
-
-
-
-
-
igneous rocks
-
igneous rocks
-
volcanic rocks
-
pyroclastics
-
tuff (1)
-
-
-
-
volcanic ash (2)
-
-
metamorphic rocks
-
K-bentonite (6)
-
metabentonite (1)
-
metamorphic rocks
-
gneisses
-
granite gneiss (1)
-
-
metasedimentary rocks (1)
-
metavolcanic rocks (1)
-
slates (1)
-
-
-
minerals
-
carbonates
-
calcite (1)
-
-
halides
-
fluorides
-
fluorite (1)
-
-
-
K-bentonite (6)
-
metabentonite (1)
-
minerals (2)
-
oxides
-
iron oxides (1)
-
-
phosphates
-
apatite (5)
-
-
silicates
-
framework silicates
-
feldspar group
-
alkali feldspar
-
K-feldspar (2)
-
-
-
-
orthosilicates
-
nesosilicates
-
zircon group
-
zircon (3)
-
-
-
-
sheet silicates
-
clay minerals
-
smectite (1)
-
-
illite (1)
-
mica group
-
glauconite (1)
-
-
-
-
sulfates
-
barite (3)
-
-
sulfides
-
galena (7)
-
iron sulfides (1)
-
marcasite (1)
-
millerite (1)
-
sphalerite (4)
-
violarite (1)
-
-
-
Primary terms
-
absolute age (20)
-
Africa
-
Nile Valley (2)
-
-
Arctic region
-
Greenland (1)
-
-
Asia
-
Brahmaputra River (2)
-
Far East
-
China (1)
-
-
-
Atlantic Ocean
-
North Atlantic
-
North Sea (1)
-
-
-
barite deposits (4)
-
bentonite deposits (2)
-
bibliography (3)
-
brines (5)
-
Canada
-
Eastern Canada
-
Maritime Provinces
-
Nova Scotia
-
Gays River Deposit (1)
-
-
-
Ontario (1)
-
-
Western Canada
-
Alberta (1)
-
Manitoba
-
Lake Winnipeg (1)
-
Nelson River (1)
-
-
-
-
carbon
-
C-13/C-12 (8)
-
C-14 (13)
-
-
catalogs (2)
-
Cenozoic
-
Quaternary
-
Holocene
-
lower Holocene (1)
-
upper Holocene (9)
-
-
Pleistocene
-
Illinoian (1)
-
Loveland Loess (2)
-
Peoria Loess (7)
-
Roxana Silt (5)
-
upper Pleistocene
-
Sangamonian (1)
-
Wisconsinan
-
middle Wisconsinan (1)
-
upper Wisconsinan (6)
-
-
-
Wedron Formation (2)
-
-
upper Quaternary (5)
-
-
Tertiary
-
Neogene
-
Miocene
-
upper Miocene
-
Messinian (2)
-
-
-
Pliocene
-
upper Pliocene (1)
-
-
-
Paleogene
-
Eocene
-
Absaroka Supergroup (1)
-
-
Paleocene
-
lower Paleocene
-
K-T boundary (1)
-
-
-
-
-
-
Chordata
-
Vertebrata
-
Tetrapoda
-
Mammalia
-
Theria
-
Eutheria
-
Proboscidea
-
Mastodontoidea (1)
-
-
-
-
-
-
-
-
clay mineralogy (5)
-
climate change (3)
-
crust (13)
-
crystal chemistry (1)
-
crystal growth (1)
-
data processing (5)
-
deformation (5)
-
diagenesis (8)
-
earthquakes (58)
-
economic geology (39)
-
education (1)
-
electron microscopy (1)
-
energy sources (1)
-
engineering geology (8)
-
environmental geology (1)
-
epeirogeny (1)
-
Europe
-
Baltic region
-
Estonia (1)
-
-
Rhine Basin (1)
-
Rhine River (1)
-
Western Europe
-
Meuse River (1)
-
Netherlands
-
Limburg Netherlands (1)
-
-
-
-
faults (41)
-
folds (7)
-
foundations (1)
-
fractures (3)
-
geochemistry (21)
-
geochronology (12)
-
geodesy (3)
-
geomorphology (22)
-
geophysical methods (22)
-
geophysics (1)
-
glacial geology (5)
-
government agencies
-
survey organizations (1)
-
-
Graptolithina
-
Graptoloidea (1)
-
-
ground water (7)
-
heat flow (1)
-
hydrogen
-
D/H (1)
-
deuterium (1)
-
-
hydrogeology (4)
-
hydrology (7)
-
ichnofossils (1)
-
igneous rocks
-
volcanic rocks
-
pyroclastics
-
tuff (1)
-
-
-
-
inclusions
-
fluid inclusions (11)
-
-
intrusions (4)
-
Invertebrata
-
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Mississippi Valley
Evaluating controls on scroll bar spacing and morphology: comparing chute channel and main channel scroll bar development Available to Purchase
Abstract Scroll bars are curvilinear ridges of sediment deposited as meandering channels migrate laterally. It is unclear exactly which variables control the spacing, height, and curvature of scroll ridges, and in turn how these properties record channel migration histories. This study tests the relationship between channel and scroll bar geometries in river systems with laterally migrating chute channels that deposit their own scroll packages. LiDAR- and Shuttle Radar Topography Mission-derived digital elevation models (DEMs) are used to calculate the spacing, relief, wavelength, and curvature of scroll bars in eight different chute-channel-dominated river systems with a range of channel dimensions, slopes, and water and sediment discharge regimes. Seven of the eight rivers have statistically indistinguishable chute channel (CC) and main channel (MC) scroll spacings, even though the chute channels have smaller channel dimensions. Additionally, there is no correlation between scroll spacing and relief for main or chute channels. For LiDAR-derived DEMs, the ratio between median scroll spacing and median channel width is low and falls within a narrow range for MC scrolls (from 0.13 to 0.22; mean 0.16), but is higher with a wider range for CC scrolls (from 0.48 to 1.33; mean 0.8). CC scrolls are straighter overall than MC scrolls, but there is no correlation between curvature and scroll spacing. Overall, these results show that (1) chute channel scrolls are often indistinguishable from main channel scrolls based on spacing and relief, and (2) MC and CC scrolls have different relationships with formative channel widths, which suggests that other variables, such as lateral migration rate and flood inundation depth, are key controls on scroll bar geometries.
Transport and Fate of Nitrate in a Saturated Buffer Zone as Assessed With a Chloride Tracer Test Open Access
The Past, Present, and Future Mississippi River Available to Purchase
Climate and anthropogenic impacts on North American erosion and sediment transport since the Last Glacial Maximum: Evidence from the detrital zircon record of the Lower Mississippi Valley, USA Available to Purchase
Predicting backward erosion piping hazard, Lower Mississippi Valley, USA Free
Quaternary Uplift in the Lower Mississippi River Valley Available to Purchase
Lithostratigraphy, Biostratigraphy, Stratigraphic Architecture, and Depositional Systems in Lower to Middle Mississippian Strata on the Western Flank of the Ozark Dome, Midcontinent U.S.A. Available to Purchase
ABSTRACT Lithologies, depositional environments, stratigraphic architecture, and conodont biostratigraphy of Lower to Middle Mississippian rocks in the western Ozarks comprise five depositional sequences in ramps on the southern Burlington shelf. Aggradational ramps in the Kinderhookian to early Osagean St. Joe group were relatively strongly overprinted by Ouachita-related tectonism involving inferred recurrent passage of fore-bulge highs and associated basins across central and southern parts of the outcrop area. Significant effects of tectonism are southward facies shallowing onto the broad Kanoka ridge paleotopographic high associated with locally extensive marine and lesser subaerial erosion, sediment thickening and deposition of generally northward down-lapping, resedimented wedges with dislodged reef blocks and conglomerates into relatively rapidly subsiding basins, and formation of a regionally extensive paleosol at the top of the group. Back-stepping subsidence due to middle Osagean foundering of the Kanoka ridge was followed by rapid, long-distance progradation of middle- and outer-ramp facies in the Bentonville and Reeds Spring limestones. Tectonism at this time resulted variously in local folding, uplift, marine and subaerial erosion, and reversal of shelf bathymetry. Southward erosion of the Reeds Spring and Bentonville occurred at least in Oklahoma on rejuvenated segments of the Kanoka ridge. Overlying lower Meramecian limestones are shallow-water deposits truncated by a major unconformity.
Evolution of fluvial meander-belt deposits and implications for the completeness of the stratigraphic record Open Access
Testing the early Late Ordovician cool-water hypothesis with oxygen isotopes from conodont apatite Available to Purchase
Quaternary Displacement Rates on the Meeman‐Shelby Fault and Joiner Ridge Horst, Eastern Arkansas: Results from Coring Mississippi River Alluvium Available to Purchase
Overbank sedimentation from the historic A.D. 2011 flood along the Lower Mississippi River, USA Available to Purchase
Connecting the backwater hydraulics of coastal rivers to fluvio-deltaic sedimentology and stratigraphy Available to Purchase
Continuity of the Reelfoot Fault across the Cottonwood Grove and Ridgely Faults of the New Madrid Seismic Zone Available to Purchase
Formation of the Marianna Gap, A Transverse Stream Valley, through Crowley’s Ridge, Northern Mississippi Alluvial Valley, U.S.A. Available to Purchase
Structural Evolution and Petroleum Potential of a Cambrian Intracratonic Rift System—Mississippi Valley Graben, Rough Creek Graben, and Rome Trough of Kentucky, USA Available to Purchase
Abstract Drilling and geophysical data demonstrate that the Mississippi Valley graben, the Rough Creek graben, and the Rome trough are fault-bounded graben structures filled with as much as 27,000 feet of Cambrian sediments. Data including stratigraphic tops from 1,764 wells, 106 seismic profiles, aeromagnetic and gravity surveys, and mapped surface geology at a 1:24,000 scale have been used to study seven stratigraphic packages resolvable in both wells and seismic profiles across parts of Kentucky, Ohio, Indiana, Illinois, Missouri, and Tennessee. Detailed analyses of the thickness patterns of these stratigraphic packages have been used to interpret the locations and timing of movements along major faults systems in the study area. Active rifting of the Precambrian crystalline bedrock began by the Early Cambrian, and resulted in thick, sand-rich deposits of the Reelfoot Arkose in the Mississippi Valley graben and Rough Creek graben, and the Rome Formation in the Rome trough. Subsidence continued in these grabens during the Middle to Late Cambrian, leading to an alternating succession of shales and carbonates being deposited (Eau Claire Formation of the Illinois basin and Conasauga Group of the Appalachian basin) on top of the coarse clastic Reelfoot Arkose and Rome Formation. Although the tectonic extension that formed these features ended by the Late Cambrian, fault zone reactivation during the Taconic, Acadian, and Alleghenian Orogenies altered fault block orientations and produced areas of basin inversion, creating the possibility of numerous deep structural traps for hydrocarbons sourced by the Cambrian shales of the Eau Claire Formation and Conasauga Group.
Examination of the Reelfoot Rift Petroleum System, South-Central United States, and the Elements that Remain for Potential Exploration and Development Available to Purchase
Abstract The Reelfoot rift is one segment of a late Proterozoic(?) to early Paleozoic intracontinental rift complex in the south-central United States. The rift complex is situated beneath Mesozoic to Cenozoic strata of the Mississippi embayment of southeastern Missouri, northeastern Arkansas, and western Tennessee and Kentucky. The rift portion of the stratigraphic section consists primarily of synrift Cambrian and Ordovician strata, capped by a postrift sag succession of Late Ordovician to Cenozoic age. Potential synrift source rocks have been identified in the Cambrian Elvins Shale. Thermal maturity of Paleozoic strata within the rift ranges from the oil window to the dry gas window. Petroleum generation in Elvins source rocks likely occurred during the middle to late Paleozoic. Upper Cretaceous sedimentary rocks unconformably overlie various Paleozoic units and define the likely upper boundary of the petroleum system. No production has been established in the Reelfoot rift. However, at least nine of 22 exploratory wells have reported petroleum shows, mainly gas shows with some asphalt or solid hydrocarbon residue. Regional seismic profiling shows the presence of two large inversion structures (Blytheville arch and Pascola arch). The Blytheville arch is marked by a core of structurally thickened Elvins Shale, whereas the Pascola arch reflects the structural uplift of a portion of the entire rift basin. Structural uplift and faulting within the Reelfoot rift since the late Paleozoic appear to have disrupted older conventional hydrocarbon traps and likely spilled any potential conventional petroleum accumulations. The remaining potential resources within the Reelfoot rift are likely shale gas accumulations within the Elvins Shale; however, reservoir continuity and porosity as well as pervasive faulting appear to be significant future challenges for explorers and drillers.