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Format
Article Type
Journal
Publisher
Section
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
-
Africa
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North Africa
-
Atlas Mountains
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Moroccan Atlas Mountains
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Anti-Atlas (1)
-
-
-
Morocco
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Moroccan Atlas Mountains
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Anti-Atlas (1)
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Southern Africa
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Karoo Basin (1)
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South Africa (1)
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Asia
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Arabian Peninsula
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Oman (1)
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Far East
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China
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Guangxi China (1)
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Guizhou China (1)
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Inner Mongolia China (1)
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North China Platform (1)
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Ordos Basin (1)
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Shanxi China (1)
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Xinjiang China
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Junggar Basin (1)
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Japan (1)
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Middle East
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Iran (1)
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Siberia (1)
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Australasia
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New Zealand
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Southland New Zealand
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Fiordland (1)
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Bear Valley (1)
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Canada
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Eastern Canada
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Newfoundland and Labrador
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Newfoundland
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Avalon Peninsula (1)
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Ontario
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Michipicoten Island (1)
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Western Canada
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Alberta
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Dinosaur Provincial Park (1)
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Northwest Territories (1)
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Saskatchewan (1)
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Europe
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Southern Europe
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Variscides (1)
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France
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Mexico
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North America
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Canadian Shield
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Keweenawan Rift (1)
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Rocky Mountains (1)
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Western Interior (1)
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Pacific Ocean
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North Pacific
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Northwest Pacific
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Japan Sea
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Japan Basin (1)
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West Pacific
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Northwest Pacific
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Japan Sea
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Japan Basin (1)
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Sierra Nevada (1)
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South Island (2)
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United States
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Arizona
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Apache County Arizona (1)
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Petrified Forest National Park (2)
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California (1)
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Colorado (1)
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Denver Basin (1)
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Michigan
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Michigan Lower Peninsula
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Lake County Michigan (1)
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Michigan Upper Peninsula
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Keweenaw County Michigan (1)
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Midcontinent (2)
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Minnesota
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Cook County Minnesota (1)
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Missouri
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Jefferson County Missouri (1)
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Ralls County Missouri (1)
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Saint Louis County Missouri (1)
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Montana (2)
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New England (1)
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Southwestern U.S. (1)
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Wyoming (1)
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-
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elements, isotopes
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carbon
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C-13/C-12 (4)
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organic carbon (1)
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isotope ratios (5)
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isotopes
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radioactive isotopes
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U-238/U-235 (1)
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stable isotopes
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C-13/C-12 (4)
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Lu/Hf (1)
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metals
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actinides
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uranium
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U-238/U-235 (1)
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rare earths (1)
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-
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fossils
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Chordata
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Vertebrata
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Tetrapoda
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Mammalia (1)
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Reptilia
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Diapsida
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Archosauria
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dinosaurs (6)
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Pterosauria (1)
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Synapsida
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Therapsida (1)
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-
-
-
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Cloudina (1)
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Invertebrata
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Mollusca
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Cephalopoda
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Ammonoidea (1)
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-
-
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Metazoa (2)
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microfossils
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Conodonta (2)
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palynomorphs (2)
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Plantae
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Spermatophyta
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Angiospermae (1)
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geochronology methods
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Ar/Ar (2)
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Lu/Hf (1)
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paleomagnetism (8)
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Sm/Nd (1)
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tephrochronology (1)
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thermochronology (1)
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U/Pb (27)
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geologic age
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Cenozoic
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Tertiary
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Neogene
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Miocene
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upper Miocene
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Messinian (1)
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Paleogene
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Eocene
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Bridger Formation (1)
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Bridgerian (1)
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middle Eocene (2)
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Uintan (1)
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Paleocene
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lower Paleocene
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Puercan (1)
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-
-
-
-
-
Mesozoic
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Cretaceous
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Lower Cretaceous
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Valanginian (1)
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Upper Cretaceous
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Bearpaw Formation (1)
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Belly River Formation (2)
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Campanian
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Dinosaur Park Formation (2)
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upper Campanian (1)
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-
Horseshoe Canyon Formation (1)
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Judith River Formation (1)
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Oldman Formation (1)
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Two Medicine Formation (1)
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Jurassic
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Lower Jurassic
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Pliensbachian (1)
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Toarcian (1)
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Middle Jurassic
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Aalenian (1)
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Triassic
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Lower Triassic
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Olenekian (1)
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Permian-Triassic boundary (3)
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Middle Triassic
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Anisian (1)
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Upper Triassic
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Chinle Formation (2)
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Norian (2)
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-
-
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Paleozoic
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Cambrian
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Lower Cambrian
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Tommotian (1)
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-
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Carboniferous (2)
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Devonian
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Upper Devonian (1)
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Ordovician
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Middle Ordovician
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Deicke Bentonite Bed (1)
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Millbrig Bentonite Bed (1)
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Upper Ordovician (1)
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Permian
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Guadalupian (1)
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Lower Permian
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Cisuralian (2)
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Middle Permian (1)
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Upper Permian
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Lopingian (1)
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Permian-Triassic boundary (3)
-
-
-
Taiyuan Formation (1)
-
upper Paleozoic
-
Shanxi Formation (1)
-
-
-
Precambrian
-
Nonesuch Shale (1)
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North Shore Volcanics (2)
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Osler Series (1)
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upper Precambrian
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Proterozoic
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Keweenawan
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Portage Lake Lava Series (1)
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-
Mesoproterozoic
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Freda Sandstone (1)
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-
Neoproterozoic
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Ediacaran (1)
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-
Oronto Group (1)
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Paleoproterozoic
-
Orosirian (1)
-
-
-
-
-
-
igneous rocks
-
igneous rocks
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plutonic rocks
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diorites
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tonalite (1)
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-
granites
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aplite (1)
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A-type granites (1)
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I-type granites (1)
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S-type granites (1)
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-
-
volcanic rocks
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andesites (1)
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basalts
-
olivine tholeiite (1)
-
-
pyroclastics
-
tuff (2)
-
-
rhyolites (1)
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-
-
volcanic ash (2)
-
-
metamorphic rocks
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K-bentonite (2)
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metamorphic rocks
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gneisses (1)
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granulites (1)
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migmatites (1)
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-
-
minerals
-
K-bentonite (2)
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oxides
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goethite (1)
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hematite (1)
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maghemite (1)
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magnetite (1)
-
-
silicates
-
orthosilicates
-
nesosilicates
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garnet group (1)
-
zircon group
-
zircon (20)
-
-
-
-
sheet silicates
-
mica group
-
biotite (1)
-
-
-
-
-
Primary terms
-
absolute age (23)
-
Africa
-
North Africa
-
Atlas Mountains
-
Moroccan Atlas Mountains
-
Anti-Atlas (1)
-
-
-
Morocco
-
Moroccan Atlas Mountains
-
Anti-Atlas (1)
-
-
-
-
Southern Africa
-
Karoo Basin (1)
-
South Africa (1)
-
-
-
Asia
-
Arabian Peninsula
-
Oman (1)
-
-
Far East
-
China
-
Guangxi China (1)
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Guizhou China (1)
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Inner Mongolia China (1)
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North China Platform (1)
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Ordos Basin (1)
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Shanxi China (1)
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Xinjiang China
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Junggar Basin (1)
-
-
-
Japan (1)
-
-
Middle East
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Iran (1)
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Siberia (1)
-
-
Australasia
-
New Zealand
-
Southland New Zealand
-
Fiordland (1)
-
-
-
-
Canada
-
Eastern Canada
-
Newfoundland and Labrador
-
Newfoundland
-
Avalon Peninsula (1)
-
-
-
Ontario
-
Michipicoten Island (1)
-
-
-
Western Canada
-
Alberta
-
Dinosaur Provincial Park (1)
-
-
Northwest Territories (1)
-
Saskatchewan (1)
-
-
-
carbon
-
C-13/C-12 (4)
-
organic carbon (1)
-
-
Cenozoic
-
Tertiary
-
Neogene
-
Miocene
-
upper Miocene
-
Messinian (1)
-
-
-
-
Paleogene
-
Eocene
-
Bridger Formation (1)
-
Bridgerian (1)
-
middle Eocene (2)
-
Uintan (1)
-
-
Paleocene
-
lower Paleocene
-
Puercan (1)
-
-
-
-
-
-
Chordata
-
Vertebrata
-
Tetrapoda
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Mammalia (1)
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Reptilia
-
Diapsida
-
Archosauria
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dinosaurs (6)
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Pterosauria (1)
-
-
-
Synapsida
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Therapsida (1)
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-
-
-
-
-
climate change (3)
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continental drift (1)
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crust (3)
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deformation (1)
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Europe
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Southern Europe
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Italy (1)
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Variscides (1)
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Western Europe
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France
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Central Massif (1)
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-
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faults (2)
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folds (1)
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geochemistry (3)
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geochronology (2)
-
igneous rocks
-
plutonic rocks
-
diorites
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tonalite (1)
-
-
granites
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aplite (1)
-
A-type granites (1)
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I-type granites (1)
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S-type granites (1)
-
-
-
volcanic rocks
-
andesites (1)
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basalts
-
olivine tholeiite (1)
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pyroclastics
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tuff (2)
-
-
rhyolites (1)
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-
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intrusions (3)
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Invertebrata
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Mollusca
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Cephalopoda
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Ammonoidea (1)
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-
-
-
isotopes
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radioactive isotopes
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U-238/U-235 (1)
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stable isotopes
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C-13/C-12 (4)
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-
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mantle (2)
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Mesozoic
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Cretaceous
-
Lower Cretaceous
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Valanginian (1)
-
-
Upper Cretaceous
-
Bearpaw Formation (1)
-
Belly River Formation (2)
-
Campanian
-
Dinosaur Park Formation (2)
-
upper Campanian (1)
-
-
Horseshoe Canyon Formation (1)
-
Judith River Formation (1)
-
Oldman Formation (1)
-
Two Medicine Formation (1)
-
-
-
Jurassic
-
Lower Jurassic
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Pliensbachian (1)
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Toarcian (1)
-
-
Middle Jurassic
-
Aalenian (1)
-
-
-
Triassic
-
Lower Triassic
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Olenekian (1)
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Permian-Triassic boundary (3)
-
-
Middle Triassic
-
Anisian (1)
-
-
Upper Triassic
-
Chinle Formation (2)
-
Norian (2)
-
-
-
-
metals
-
actinides
-
uranium
-
U-238/U-235 (1)
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-
-
rare earths (1)
-
-
metamorphic rocks
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gneisses (1)
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granulites (1)
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migmatites (1)
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-
metamorphism (2)
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Mexico
-
Baja California (1)
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-
North America
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Canadian Shield
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Slave Province (1)
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Keweenawan Rift (1)
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Lake Superior region (2)
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Rocky Mountains (1)
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Western Interior (1)
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orogeny (3)
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Pacific Ocean
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North Pacific
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Northwest Pacific
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Japan Sea
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Japan Basin (1)
-
-
-
-
West Pacific
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Northwest Pacific
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Japan Sea
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Japan Basin (1)
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-
-
-
-
paleoclimatology (4)
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paleoecology (2)
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paleogeography (4)
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paleomagnetism (8)
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Paleozoic
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Cambrian
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Lower Cambrian
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Tommotian (1)
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-
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Carboniferous (2)
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Devonian
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Upper Devonian (1)
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Ordovician
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Middle Ordovician
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Deicke Bentonite Bed (1)
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Millbrig Bentonite Bed (1)
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-
Upper Ordovician (1)
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-
Permian
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Guadalupian (1)
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Lower Permian
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Cisuralian (2)
-
-
Middle Permian (1)
-
Upper Permian
-
Lopingian (1)
-
Permian-Triassic boundary (3)
-
-
-
Taiyuan Formation (1)
-
upper Paleozoic
-
Shanxi Formation (1)
-
-
-
palynomorphs (2)
-
Plantae
-
Spermatophyta
-
Angiospermae (1)
-
-
-
plate tectonics (4)
-
Precambrian
-
Nonesuch Shale (1)
-
North Shore Volcanics (2)
-
Osler Series (1)
-
upper Precambrian
-
Proterozoic
-
Keweenawan
-
Portage Lake Lava Series (1)
-
-
Mesoproterozoic
-
Freda Sandstone (1)
-
-
Neoproterozoic
-
Ediacaran (1)
-
-
Oronto Group (1)
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Paleoproterozoic
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Orosirian (1)
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-
-
-
-
sedimentary rocks
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carbonate rocks
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grainstone (1)
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packstone (1)
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clastic rocks
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coal (1)
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sedimentation (1)
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sediments (1)
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stratigraphy (1)
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tectonics (3)
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United States
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Arizona
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Apache County Arizona (1)
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California (1)
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Colorado (1)
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Denver Basin (1)
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Michigan
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Michigan Lower Peninsula
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Lake County Michigan (1)
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Michigan Upper Peninsula
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Keweenaw County Michigan (1)
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Midcontinent (2)
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Minnesota
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Cook County Minnesota (1)
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Missouri
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Jefferson County Missouri (1)
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Ralls County Missouri (1)
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Saint Louis County Missouri (1)
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Montana (2)
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New England (1)
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Southwestern U.S. (1)
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Wyoming (1)
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rock formations
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Ara Group (1)
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Beaufort Group (1)
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Emeishan Basalts (1)
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Karoo Supergroup (1)
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-
sedimentary rocks
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sedimentary rocks
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carbonate rocks
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grainstone (1)
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clastic rocks
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sandstone (4)
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coal (1)
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volcaniclastics (4)
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sedimentary structures
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sedimentary structures
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biogenic structures
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stromatolites (1)
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thrombolites (1)
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-
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-
sediments
-
sediments (1)
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volcaniclastics (4)
-
GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Magnetostratigraphy and U-Pb geochronology of the middle Eocene Bridger Formation (Wyoming, USA): Implications for the age and correlation of the Bridgerian/Uintan NALMA boundary and calibration of the Geomagnetic Polarity Time Scale Available to Purchase
The timing and duration of large-scale carbon release in the Early Jurassic Available to Purchase
Updating the Upper Cretaceous (Campanian) Two Medicine Formation of Montana: Lithostratigraphic revisions, new CA-ID-TIMS U-Pb ages, and a calibrated framework for dinosaur occurrences Available to Purchase
Recommendations for the reporting and interpretation of isotope dilution U-Pb geochronological information Open Access
U–Pb age constraints on the Carboniferous–Permian transition in continental basins of eastern equatorial Pangaea (France): implications for the depositional history and correlations across the late Variscan Belt Available to Purchase
The “Judith River–Belly River problem” revisited (Montana-Alberta-Saskatchewan): New perspectives on the correlation of Campanian dinosaur-bearing strata based on a revised stratigraphic model updated with CA-ID-TIMS U-Pb geochronology Available to Purchase
Calibrating geologic strata, dinosaurs, and other fossils at Dinosaur Provincial Park (Alberta, Canada) using a new CA-ID-TIMS U–Pb geochronology Open Access
Calibrating the Early Cretaceous Urho Pterosaur Fauna in Junggar Basin and implications for the evolution of the Jehol Biota Available to Purchase
Ordovician tephra distribution, tephrochronology and geochronology Available to Purchase
Abstract The study of Ordovician tephras yields a wealth of valuable information about regional tectonism, sedimentation, stratigraphic correlation, and process rates. As such, these layers are prized by geologists and are the subject of a rich literature. Ordovician tephra studies were pioneering, particularly in the development of chemical fingerprinting to improve precision in tephrochronology. Modern radioisotope geochronology utilizes zircons and other phenocrysts from these layers to generate eruption ages with uncertainty on the order of a hundred thousand years. When integrated with biostratigraphy, chemostratigraphy and astrochronology, tephra ages provide an unparalleled opportunity to constrain process rates. Fifty such Ordovician tephra ages have been published over the last decade from U–Pb analysis of individual zircon phenocrysts, providing geochronological coverage across all stages of the Ordovician. Laurentia dominates this coverage (24) followed by the Baltic Basin (12), North Gondwana (11), Cuyania (four) and the Siberian Tungus Basin (one). Future tephra studies should seek to fill the numerous remaining gaps in the Ordovician time scale.