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Section
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Far East
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China (1)
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Atlantic Ocean
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North Atlantic
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Faeroe-Shetland Basin (1)
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Gulf of Mexico (1)
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Rockall Trough (1)
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Australasia
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Australia
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Black Mesa Basin (6)
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Canada
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Queen Elizabeth Islands
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Western Canada
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Cedar Hill Field (2)
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Europe
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Western Europe
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United Kingdom
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Great Britain
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England (1)
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Scotland
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Hebrides
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Highland region Scotland
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Inverness-shire Scotland
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Grand Canyon (1)
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Green River basin (3)
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Mexico
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North America
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Appalachian Basin (6)
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Basin and Range Province
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Great Plains (4)
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Colorado
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Archuleta County Colorado (5)
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Montezuma County Colorado (3)
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Nevada (4)
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Colfax County New Mexico (2)
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Grants mineral belt (2)
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Jemez Mountains (1)
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McKinley County New Mexico
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Grants mining district (2)
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Rio Arriba County New Mexico (15)
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San Juan County New Mexico (45)
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Sandoval County New Mexico (17)
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Valencia County New Mexico (2)
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North Dakota (1)
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Ohio (1)
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Oklahoma (3)
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Sevier orogenic belt (1)
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Southwestern U.S. (3)
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Big Bend National Park (1)
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Fort Worth Basin (2)
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Galveston Texas (1)
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U. S. Rocky Mountains
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Uinta Basin (8)
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Utah
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Carbon County Utah (1)
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Emery County Utah (1)
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Kaiparowits Plateau (1)
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San Juan County Utah (3)
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Sanpete County Utah (1)
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Western U.S. (7)
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Wyoming
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Teton County Wyoming
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Wind River basin (2)
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commodities
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energy sources (7)
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mineral deposits, genesis (7)
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petroleum
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placers (1)
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elements, isotopes
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hydrogen (1)
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isotope ratios (6)
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isotopes
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stable isotopes
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C-13/C-12 (5)
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Hf-177/Hf-176 (1)
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O-18/O-16 (2)
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S-34/S-32 (1)
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metals
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alkaline earth metals
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magnesium (1)
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gold (1)
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hafnium
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Hf-177/Hf-176 (1)
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iron (1)
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platinum group
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iridium (2)
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platinum (1)
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rare earths (1)
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nitrogen (2)
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oxygen
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O-18/O-16 (2)
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sulfur
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S-34/S-32 (1)
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-
-
fossils
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Chordata
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Vertebrata
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Pisces
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Osteichthyes
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Actinopterygii
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Holostei
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Halecostomi (1)
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Tetrapoda
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Mammalia
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Multituberculata (2)
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Theria
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Eutheria
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Amblypoda
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Pantodonta (2)
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Carnivora (1)
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Condylarthra (2)
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Insectivora (2)
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Perissodactyla (1)
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Primates (1)
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Taeniodonta (1)
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Reptilia
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Anapsida
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Testudines
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Cryptodira (1)
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Diapsida
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Archosauria
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dinosaurs
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Ornithischia
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Ceratopsia
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Ceratopsidae (2)
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Ornithopoda
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Hadrosauridae (1)
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-
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Saurischia
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Sauropodomorpha
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Sauropoda (1)
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Theropoda
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Coelurosauria (1)
-
-
-
-
-
Lepidosauria
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Squamata
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Serpentes (1)
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-
-
-
-
-
-
-
Invertebrata
-
Mollusca
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Cephalopoda
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Ammonoidea
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Ammonites (1)
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-
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Protista
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Foraminifera (3)
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microfossils (7)
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palynomorphs
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megaspores (1)
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miospores
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pollen (1)
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Plantae
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Pteridophyta
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Lycopsida (1)
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Spermatophyta
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Angiospermae (2)
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Gymnospermae
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Coniferales
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Cupressaceae (1)
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geochronology methods
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(U-Th)/He (1)
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Ar/Ar (3)
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fission-track dating (1)
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K/Ar (1)
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paleomagnetism (9)
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Rb/Sr (1)
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tephrochronology (1)
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tree rings (1)
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U/Pb (8)
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geologic age
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Cenozoic
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Quaternary
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Holocene (2)
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Tertiary
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lower Tertiary (4)
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Paleogene
-
Eocene
-
lower Eocene
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Wasatchian (2)
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Willwood Formation (2)
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Ypresian
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London Clay (1)
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-
-
-
Paleocene
-
lower Paleocene
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Danian (1)
-
K-T boundary (1)
-
Puercan (5)
-
Torrejonian (9)
-
-
middle Paleocene (3)
-
Nacimiento Formation (14)
-
Sentinel Butte Formation (1)
-
Tullock Member (1)
-
upper Paleocene
-
Clarkforkian (1)
-
Tiffanian (3)
-
-
-
Wasatch Formation (3)
-
Wilcox Group (2)
-
-
-
-
Mesozoic
-
Cretaceous
-
Dakota Formation (10)
-
Lower Cretaceous
-
Burro Canyon Formation (3)
-
-
Mancos Shale (16)
-
Middle Cretaceous (1)
-
Upper Cretaceous
-
Campanian
-
upper Campanian (1)
-
-
Cardium Formation (1)
-
Coniacian (1)
-
Crevasse Canyon Formation (3)
-
Ferron Sandstone Member (1)
-
Frontier Formation (1)
-
Fruitland Formation (27)
-
Gallup Sandstone (10)
-
Kirtland Shale (16)
-
K-T boundary (1)
-
Lewis Shale (5)
-
Maestrichtian (3)
-
Menefee Formation (3)
-
Mesaverde Group (8)
-
Niobrara Formation (2)
-
Ojo Alamo Sandstone (13)
-
Pictured Cliffs Sandstone (7)
-
Point Lookout Sandstone (3)
-
Santonian (1)
-
Senonian (8)
-
Turonian (2)
-
-
-
Jurassic
-
Middle Jurassic
-
Todilto Formation (1)
-
-
Oxford Clay (1)
-
Upper Jurassic
-
Brushy Basin Member (3)
-
Entrada Sandstone (4)
-
Morrison Formation (12)
-
Smackover Formation (1)
-
Westwater Canyon Sandstone Member (3)
-
-
-
Triassic
-
Upper Triassic
-
Chinle Formation (1)
-
Petrified Forest Member (1)
-
-
-
-
Paleozoic
-
Carboniferous
-
Mississippian
-
Barnett Shale (1)
-
Mission Canyon Limestone (1)
-
Upper Mississippian
-
Fayetteville Formation (1)
-
-
-
Pennsylvanian
-
Middle Pennsylvanian
-
Atokan
-
Atoka Formation (1)
-
-
Desmoinesian (1)
-
Paradox Formation (2)
-
-
Morrow Formation (1)
-
Upper Pennsylvanian
-
Canyon Group (1)
-
-
-
-
Devonian
-
Middle Devonian
-
Marcellus Shale (1)
-
-
Upper Devonian
-
Ohio Shale (2)
-
-
-
Hunton Group (1)
-
Minnelusa Formation (2)
-
New Albany Shale (2)
-
Ordovician
-
Upper Ordovician
-
Red River Formation (1)
-
-
-
upper Paleozoic
-
Antrim Shale (3)
-
-
Woodford Shale (1)
-
-
-
igneous rocks
-
igneous rocks
-
plutonic rocks
-
granites (1)
-
-
volcanic rocks
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pyroclastics
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tuff (1)
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trachyandesites (1)
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-
-
volcanic ash (2)
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-
metamorphic rocks
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metamorphic rocks (1)
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minerals
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nitrates (1)
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oxides
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hematite (2)
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ilmenite (2)
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magnetite (1)
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titanomagnetite (1)
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phosphates
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apatite (3)
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francolite (1)
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silicates
-
framework silicates
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feldspar group
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alkali feldspar
-
sanidine (3)
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-
-
zeolite group (1)
-
-
orthosilicates
-
nesosilicates
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garnet group (1)
-
zircon group
-
zircon (2)
-
-
-
-
sheet silicates
-
clay minerals
-
smectite (1)
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-
mica group
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biotite (1)
-
-
-
-
-
Primary terms
-
absolute age (14)
-
Asia
-
Far East
-
China (1)
-
-
-
Atlantic Ocean
-
North Atlantic
-
Faeroe-Shetland Basin (1)
-
Gulf of Mexico (1)
-
Rockall Trough (1)
-
-
-
Australasia
-
Australia
-
Bass Strait
-
Bass Basin (1)
-
-
South Australia (1)
-
-
-
bibliography (2)
-
biogeography (2)
-
brines (1)
-
Canada
-
Arctic Archipelago (1)
-
Nunavut
-
Ellesmere Island (2)
-
-
Queen Elizabeth Islands
-
Ellesmere Island (2)
-
-
Western Canada
-
Alberta (3)
-
Northwest Territories (1)
-
-
-
carbon
-
C-13/C-12 (5)
-
organic carbon (2)
-
-
Cenozoic
-
Quaternary
-
Holocene (2)
-
-
Tertiary
-
lower Tertiary (4)
-
Paleogene
-
Eocene
-
lower Eocene
-
Wasatchian (2)
-
Willwood Formation (2)
-
Ypresian
-
London Clay (1)
-
-
-
-
Paleocene
-
lower Paleocene
-
Danian (1)
-
K-T boundary (1)
-
Puercan (5)
-
Torrejonian (9)
-
-
middle Paleocene (3)
-
Nacimiento Formation (14)
-
Sentinel Butte Formation (1)
-
Tullock Member (1)
-
upper Paleocene
-
Clarkforkian (1)
-
Tiffanian (3)
-
-
-
Wasatch Formation (3)
-
Wilcox Group (2)
-
-
-
-
Chordata
-
Vertebrata
-
Pisces
-
Osteichthyes
-
Actinopterygii
-
Holostei
-
Halecostomi (1)
-
-
-
-
-
Tetrapoda
-
Mammalia
-
Multituberculata (2)
-
Theria
-
Eutheria
-
Amblypoda
-
Pantodonta (2)
-
-
Carnivora (1)
-
Condylarthra (2)
-
Insectivora (2)
-
Perissodactyla (1)
-
Primates (1)
-
Taeniodonta (1)
-
-
-
-
Reptilia
-
Anapsida
-
Testudines
-
Cryptodira (1)
-
-
-
Diapsida
-
Archosauria
-
dinosaurs
-
Ornithischia
-
Ceratopsia
-
Ceratopsidae (2)
-
-
Ornithopoda
-
Hadrosauridae (1)
-
-
-
Saurischia
-
Sauropodomorpha
-
Sauropoda (1)
-
-
Theropoda
-
Coelurosauria (1)
-
-
-
-
-
Lepidosauria
-
Squamata
-
Serpentes (1)
-
-
-
-
-
-
-
-
clay mineralogy (1)
-
coal deposits (1)
-
continental drift (1)
-
continental shelf (1)
-
crust (2)
-
crystal structure (1)
-
data processing (4)
-
deformation (1)
-
diagenesis (9)
-
earthquakes (2)
-
economic geology (34)
-
energy sources (7)
-
Europe
-
Southern Europe
-
Italy
-
Umbria Italy
-
Perugia Italy
-
Gubbio Italy (1)
-
-
-
-
-
Western Europe
-
United Kingdom
-
Great Britain
-
England (1)
-
Scotland
-
Hebrides
-
Inner Hebrides
-
Isle of Skye (1)
-
-
-
Highland region Scotland
-
Inverness-shire Scotland
-
Isle of Skye (1)
-
-
-
-
-
-
-
-
explosions (1)
-
faults (6)
-
folds (2)
-
fractures (8)
-
geochemistry (11)
-
geochronology (7)
-
geophysical methods (12)
-
geosynclines (1)
-
geothermal energy (1)
-
government agencies
-
survey organizations (1)
-
-
ground water (8)
-
heat flow (6)
-
hydrogen (1)
-
hydrology (1)
-
igneous rocks
-
plutonic rocks
-
granites (1)
-
-
volcanic rocks
-
pyroclastics
-
tuff (1)
-
-
trachyandesites (1)
-
-
-
intrusions (1)
-
Invertebrata
-
Mollusca
-
Cephalopoda
-
Ammonoidea
-
Ammonites (1)
-
-
-
-
Protista
-
Foraminifera (3)
-
-
-
isotopes
-
stable isotopes
-
C-13/C-12 (5)
-
Hf-177/Hf-176 (1)
-
O-18/O-16 (2)
-
S-34/S-32 (1)
-
-
-
maps (4)
-
Mesozoic
-
Cretaceous
-
Dakota Formation (10)
-
Lower Cretaceous
-
Burro Canyon Formation (3)
-
-
Mancos Shale (16)
-
Middle Cretaceous (1)
-
Upper Cretaceous
-
Campanian
-
upper Campanian (1)
-
-
Cardium Formation (1)
-
Coniacian (1)
-
Crevasse Canyon Formation (3)
-
Ferron Sandstone Member (1)
-
Frontier Formation (1)
-
Fruitland Formation (27)
-
Gallup Sandstone (10)
-
Kirtland Shale (16)
-
K-T boundary (1)
-
Lewis Shale (5)
-
Maestrichtian (3)
-
Menefee Formation (3)
-
Mesaverde Group (8)
-
Niobrara Formation (2)
-
Ojo Alamo Sandstone (13)
-
Pictured Cliffs Sandstone (7)
-
Point Lookout Sandstone (3)
-
Santonian (1)
-
Senonian (8)
-
Turonian (2)
-
-
-
Jurassic
-
Middle Jurassic
-
Todilto Formation (1)
-
-
Oxford Clay (1)
-
Upper Jurassic
-
Brushy Basin Member (3)
-
Entrada Sandstone (4)
-
Morrison Formation (12)
-
Smackover Formation (1)
-
Westwater Canyon Sandstone Member (3)
-
-
-
Triassic
-
Upper Triassic
-
Chinle Formation (1)
-
Petrified Forest Member (1)
-
-
-
-
metal ores
-
uranium ores (9)
-
-
metals
-
actinides
-
uranium (2)
-
-
alkali metals
-
sodium (1)
-
-
alkaline earth metals
-
calcium (1)
-
magnesium (1)
-
-
gold (1)
-
hafnium
-
Hf-177/Hf-176 (1)
-
-
iron (1)
-
platinum group
-
iridium (2)
-
platinum (1)
-
-
rare earths (1)
-
-
metamorphic rocks (1)
-
Mexico
-
Baja California (1)
-
-
mineral deposits, genesis (7)
-
mineral exploration (1)
-
mining geology (1)
-
Mohorovicic discontinuity (1)
-
nitrogen (2)
-
North America
-
Appalachian Basin (6)
-
Basin and Range Province
-
Great Basin (1)
-
-
Great Plains (4)
-
Gulf Coastal Plain (3)
-
Michigan Basin (2)
-
North American Cordillera (2)
-
Rio Grande Rift (1)
-
Rocky Mountains
-
Northern Rocky Mountains (1)
-
Southern Rocky Mountains (1)
-
U. S. Rocky Mountains
-
San Juan Mountains (3)
-
-
-
Rocky Mountains foreland (1)
-
Western Interior
-
Western Interior Seaway (5)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
San Juan Basin
The impact of igneous intrusions on sedimentary host rocks: insights from field outcrop and subsurface data Open Access
Induced seismicity potential based on probabilistic geomechanics for the San Juan Basin CarbonSAFE project Open Access
Late Cretaceous time-transgressive onset of Laramide arch exhumation and basin subsidence across northern Arizona–New Mexico, USA, and the role of a dehydrating Farallon flat slab Available to Purchase
Linking the Gulf of Mexico and Coast Mountains batholith during late Paleocene time: Insights from Hf isotopes in detrital zircons Available to Purchase
ABSTRACT Paleocene Lower Wilcox Group sedimentation rates are three times the Cenozoic average for the Gulf of Mexico region and are attributed to Laramide tectonism within the Laramide–Rocky Mountains region. These increased rates likely represent the erosion of easily weathered Phanerozoic strata that blanketed the Laramide-age basement-cored uplifts. Geologic observations and U-Pb geochronology are not sufficient to fully address this hypothesis alone, so we conducted 439 Lu-Hf isotopic analyses on detrital zircons from eight samples from the San Juan Basin and five samples from the Gulf of Mexico Basin. Focusing on the zircons younger than 300 Ma allowed us to make direct comparisons to the eight principal components that comprise the North American Cordilleran magmatic arc: (1) Coast Mountains batholith; (2) North Cascades Range; (3) Idaho batholith; (4) Sierra Nevada batholith; (5) Laramide porphyry copper province; (6) Transverse Ranges; (7) Peninsular Ranges; and (8) Sierra Madre Occidental. The εHf ( t ) results range from +8.9 to –27.0 for the San Juan Basin samples and from +13.0 to –26.6 for the Gulf of Mexico samples. Using the San Juan Basin samples as a proxy for the eroded Mesozoic cover that was shed from the Laramide uplifts, we show that much of the sediment entering the Gulf of Mexico through the Houston and Mississippi embayments during the late Paleocene was derived from reworked cover from the greater Laramide–Rocky Mountains region. However, the Gulf of Mexico samples also include a distinct juvenile suite (εHf [ t ] ranging from +13 to +5) of zircons ranging in age from ca. 220 to 55 Ma that we traced to the Coast Mountains batholith in British Columbia, Canada. This transcontinental connection indicates an extension to the headwaters of the previously defined paleo-Mississippi drainage basin from ca. 58 to 56 Ma. Therefore, we propose a through-going fluvial system (referred to here as the “Coast Mountains River”) that was routed from the Coast Mountains batholith to the Gulf of Mexico. This expands the previously defined paleo-Mississippi drainage basin area by an estimated 280,000 km 2 . Our comprehensive Hf isotopic compilation of the North American Cordilleran magmatic arc also provides a benchmark εHf ( t ) versus U-Pb age plot, which can be used to determine provenance of detrital zircons (85–50 Ma) at the scale of specific region(s) within the Cordillera based on their εHf ( t ) values.
Carrier bed plays associated with conventional petroleum accumulations Available to Purchase
The offshore Mancos play in the San Juan Basin as a component of the Mancos total petroleum system Available to Purchase
Nonclimatic and extrabasinal processes controlled pedogenesis in paleosols of the Paleocene Nacimiento Formation, New Mexico, USA Available to Purchase
Depositional and sequence stratigraphic model of transgressive shelf sandstone: The Late Cretaceous Tocito Sandstone, San Juan Bain, New Mexico, U.S.A. Available to Purchase
A physical and chemical sedimentary record of Laramide tectonic shifts in the Cretaceous-Paleogene San Juan Basin, New Mexico, USA Open Access
Testing hypotheses on signatures of precipitation variability in the river and floodplain deposits of the Paleogene San Juan Basin, New Mexico, U.S.A. Available to Purchase
Classification of paralic channel sub-environments in an ancient system using outcrops: The Cretaceous Gallup system, New Mexico, U.S.A. Available to Purchase
Has Earth ever been ice-free? Implications for glacio-eustasy in the Cretaceous greenhouse age using high-resolution sequence stratigraphy Available to Purchase
Early Paleocene Magnetostratigraphy and Revised Biostratigraphy of the Ojo Alamo Sandstone and Lower Nacimiento Formation, San Juan Basin, New Mexico, USA Available to Purchase
Impact of Depositional and Diagenetic Heterogeneity on Multiscale Mechanical Behavior of Mancos Shale, New Mexico and Utah, USA Available to Purchase
ABSTRACT Shales are enigmatic rock types with compositional and textural heterogeneity across a range of scales. This work addresses pore- to core-scale mechanical heterogeneity of Cretaceous Mancos Shale, a thick mudstone with widespread occurrence across the western interior of the United States. Examination of a ~100 m (~328 ft) core from the eastern San Juan Basin, New Mexico, suggests division into seven lithofacies, encompassing mudstones, sandy mudstones, and muddy sandstones, displaying different degrees of bioturbation. Ultrasonic velocity measurements show small measurable differences between the lithofacies types, and these are explained in terms of differences in allogenic (clay and sand) and authigenic (carbonate cement) mineralogy. Variations in ultrasonic velocities can be related to well log velocity profiles, which allow correlation across much of the eastern San Juan Basin. A quarry block of Mancos Shale from eastern Utah, USA, a common target for unconventional exploration and ultrasonically, compositionally, and texturally similar to the laminated muddy sandstone (LMS) lithofacies of the San Juan core, is examined to sublaminae or micro-lithofacies scales using optical petrographic and electron microscopy. This is mapped to results from axisymmetric compression (ASC) and indirect tensile strength testing of this facies at the core-plug scale and nanoindentation measurements at the micron scale. As anticipated, there is a marked difference in elastic and failure response in axisymmetric and cylinder splitting tests relating to loading orientation with respect to bedding or lamination. Shear bands and Mode-I fractures display contrasting fabric when produced at low or high angles with respect to lamination. Nanoindentation, mineralogy distribution based on MAPS (modular automated processing system) technique, and high-resolution backscattered electron images show the effect of composition, texture phases, and interfaces of phases on mechanical properties. A range of Young’s moduli from nanoindentation is generally larger by a factor of 1–4 compared with ASC results, showing the important effect of pores, microcracks, and bedding boundaries on bulk elastic response. Together these data sets show the influence of cement distribution on mechanical response. Variations in micro-lithofacies are first-order factors in determining the mechanical response of this important Mancos constituent and are likely responsible for its success in hydrofracture-based recovery operations as compared with other Mancos lithofacies types.