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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Meade Basin (2)
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North America
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Great Plains
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Southern Great Plains (2)
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Gulf Coastal Plain (3)
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Rio Grande Depression (1)
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Sierra Nevada (1)
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United States
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California
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Kern County California (1)
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Southern California (1)
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Florida
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Alachua County Florida (1)
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Marion County Florida (1)
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Idaho (1)
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Kansas
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Ellis County Kansas (1)
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Meade County Kansas (2)
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Seward County Kansas (2)
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Mojave Desert (1)
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Nebraska
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Antelope County Nebraska (2)
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Brown County Nebraska (1)
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Cherry County Nebraska (2)
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Cheyenne County Nebraska (1)
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Garden County Nebraska (1)
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Knox County Nebraska (1)
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Morrill County Nebraska (1)
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Nevada
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Churchill County Nevada (1)
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Elko County Nevada (1)
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Washoe County Nevada (1)
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New Mexico (1)
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South Dakota
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Mellette County South Dakota (1)
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Todd County South Dakota (1)
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Texas
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Bee County Texas (1)
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San Jacinto County Texas (1)
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Wyoming (1)
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elements, isotopes
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carbon
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C-13/C-12 (3)
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isotope ratios (4)
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isotopes
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stable isotopes
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C-13/C-12 (3)
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O-18/O-16 (4)
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oxygen
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O-18/O-16 (4)
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fossils
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burrows (1)
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Chordata
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Vertebrata
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Tetrapoda
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Amphibia
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Lissamphibia
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Anura (1)
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Aves (1)
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Mammalia
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Theria
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Eutheria
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Artiodactyla
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Ruminantia
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Tylopoda
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Camelidae (2)
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Carnivora
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Fissipeda
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Canidae (1)
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Chiroptera (1)
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Perissodactyla
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Rhinocerotidae
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Rhinoceros (1)
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Hippomorpha
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Equidae
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Hipparion (1)
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Proboscidea
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Rodentia
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Castoridae (1)
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Reptilia
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Diapsida
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Squamata (1)
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coprolites (1)
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Invertebrata
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Mollusca
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Gastropoda
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Pulmonata
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Basommatophora (1)
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Plantae
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Pteridophyta
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Sphenopsida
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Equisetales (1)
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Spermatophyta
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Angiospermae
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Dicotyledoneae
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Magnoliidae (1)
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Monocotyledoneae
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Gramineae (2)
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Liliidae (1)
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geochronology methods
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Ar/Ar (1)
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fission-track dating (1)
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paleomagnetism (1)
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tephrochronology (2)
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geologic age
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Cenozoic
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Blancan (3)
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Quaternary
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Pleistocene
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Tertiary
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Arikareean (1)
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Catahoula Formation (1)
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Neogene
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Bone Valley Formation (1)
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Hemphillian (9)
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Miocene
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Ash Hollow Formation (4)
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Barstovian (7)
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Clarendonian (20)
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Fleming Formation (2)
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lower Miocene
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Hemingfordian (2)
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upper Miocene (5)
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Valentine Formation (3)
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Ogallala Formation (3)
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Paleogene
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igneous rocks
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Primary terms
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biogeography (1)
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carbon
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C-13/C-12 (3)
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Cenozoic
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Blancan (3)
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Quaternary
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Pleistocene
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Irvingtonian (2)
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Tertiary
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Arikareean (1)
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Catahoula Formation (1)
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Neogene
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Bone Valley Formation (1)
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Hemphillian (9)
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Miocene
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Ash Hollow Formation (4)
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Barstovian (7)
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Clarendonian (20)
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Fleming Formation (2)
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lower Miocene
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Hemingfordian (2)
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upper Miocene (5)
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Valentine Formation (3)
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Ogallala Formation (3)
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Pliocene
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lower Pliocene (2)
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middle Pliocene (1)
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Paleogene
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Oligocene (1)
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upper Tertiary (1)
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upper Cenozoic (1)
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Chordata
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Vertebrata
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Tetrapoda
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Amphibia
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Lissamphibia
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Anura (1)
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Aves (1)
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Mammalia
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Theria
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Eutheria
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Artiodactyla
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Ruminantia
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Tylopoda
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Camelidae (2)
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-
-
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Carnivora
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Fissipeda
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Canidae (1)
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-
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Chiroptera (1)
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Lagomorpha (2)
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Perissodactyla
-
Ceratomorpha
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Rhinocerotidae
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Rhinoceros (1)
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-
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Hippomorpha
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Equidae
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Hipparion (1)
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-
-
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Proboscidea
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Mastodontoidea (1)
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Rodentia
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Castoridae (1)
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Reptilia
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Diapsida
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Lepidosauria
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Squamata (1)
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climate change (3)
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coprolites (1)
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geochemistry (1)
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geochronology (1)
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geomorphology (1)
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hydrology (1)
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igneous rocks
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volcanic rocks
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pyroclastics (1)
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-
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Invertebrata
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Mollusca
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Gastropoda
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Pulmonata
-
Basommatophora (1)
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-
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isotopes
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stable isotopes
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C-13/C-12 (3)
-
O-18/O-16 (4)
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-
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North America
-
Great Plains
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Southern Great Plains (2)
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Gulf Coastal Plain (3)
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Rio Grande Depression (1)
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oxygen
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O-18/O-16 (4)
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paleobotany (2)
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paleoclimatology (3)
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paleoecology (3)
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paleogeography (1)
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paleomagnetism (1)
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paleontology (7)
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Plantae
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Pteridophyta
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Sphenopsida
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Equisetales (1)
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Spermatophyta
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Angiospermae
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Dicotyledoneae
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Magnoliidae (1)
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Monocotyledoneae
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Gramineae (2)
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Liliidae (1)
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sedimentary rocks
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clastic rocks
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sandstone (1)
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siltstone (1)
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sedimentary structures
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secondary structures
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concretions (2)
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stratigraphy (4)
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United States
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California
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Kern County California (1)
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Southern California (1)
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Florida
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Alachua County Florida (1)
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Marion County Florida (1)
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Idaho (1)
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Kansas
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Ellis County Kansas (1)
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Meade County Kansas (2)
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Seward County Kansas (2)
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Mojave Desert (1)
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Nebraska
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Antelope County Nebraska (2)
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Brown County Nebraska (1)
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Cherry County Nebraska (2)
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Cheyenne County Nebraska (1)
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Garden County Nebraska (1)
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Knox County Nebraska (1)
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Morrill County Nebraska (1)
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Nevada
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Churchill County Nevada (1)
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Elko County Nevada (1)
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Washoe County Nevada (1)
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New Mexico (1)
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South Dakota
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Mellette County South Dakota (1)
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Todd County South Dakota (1)
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Texas
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Bee County Texas (1)
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Polk County Texas (1)
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San Jacinto County Texas (1)
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Wyoming (1)
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sedimentary rocks
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sedimentary rocks
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clastic rocks
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sandstone (1)
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siltstone (1)
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sedimentary structures
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burrows (1)
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coprolites (1)
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sedimentary structures
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secondary structures
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concretions (2)
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soils
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paleosols (2)
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Clarendonian
Abstract The Lagerstätte at Ashfall Fossil Beds—the result of supervolcanic eruption—preserves a mass-death assemblage of articulated skeletons of reptiles, birds, and mammals in a 3-m-thick pure volcanic ash near the base of the Cap Rock Member of the Ash Hollow Formation in Antelope County, Nebraska. The ash originated from the Bruneau-Jarbidge caldera in southwest Idaho, some 1600 km away, and it is geochemically matched with the Ibex Hollow tuff (11.93 Ma). Ashfall is a critical Clarendonian North American Land Mammal Age locality. More than 20 taxa—predominantly medium- and large-sized ungulates preserved in three dimensions—are buried in a late Miocene paleodepression (waterhole) filled with tephra reworked from the landscape by wind and water. Smaller taxa, such as birds, turtles, and moschids, died shortly after the pyroclastic airfall event and their remains are preserved in the basal ash. Remains from the medium-sized ungulates (equids and camelids) are separated from the underlying smaller skeletons by several centimeters of ash, indicating that these animals died at a slightly later time. In turn, more than 100 mostly intact skeletons of the barrel-bodied rhinoceros, Teleoceras major , overlie the remains of the medium-sized taxa. Pathologic bone on the limbs and skulls of the horses, camels, and rhinos suggests short-term survival and slow death several weeks or months after the pyroclastic airfall event. Exquisite preservation in an information-rich context allows aspects of the behavior, social structure, intraspecific variability, and pathology of extinct species to be reconstructed.
Pedogenic carbonate stable isotope record of environmental change during the Neogene in the southern Great Plains, southwest Kansas, USA: Oxygen isotopes and paleoclimate during the evolution of C 4 -dominated grasslands
Pedogenic carbonate stable isotope record of environmental change during the Neogene in the southern Great Plains, southwest Kansas, USA: Carbon isotopes and the evolution of C 4 -dominated grasslands
The Hunter Creek Sandstone of the Verdi Basin, Nevada, yielded a succession of superposed continental faunal assemblages ranging in age from the late Clarendonian (late Miocene) through the late Blancan (late Pliocene) in the North American land mammal age framework, or ca. 10.5–2.5 Ma. We describe two new local faunas from the Hunter Creek Sandstone: the East Verdi local fauna, of late-medial to late Clarendonian age, which includes Dinohippus cf. D. leardi , Camelidae, ?Antilocapridae, and Mammutidae or Gomphotheriidae; and the Mogul local fauna, of Hemphillian age, which includes Dinohippus sp., Rhinocerotidae, Camelidae (at least two species), Mammut sp., and possibly Gomphotheriidae. A third unnamed assemblage, of latest Hemphillian or earliest Blancan age, is represented by a small sample of fossils from W.M. Keck Museum locality P-105. The only taxa recovered from this locality are cf. Megatylopus and Gomphotheriidae or Mammutidae. A single late Blancan locality, the Byland locality, yielded Equus idahoensis . The recognition of this faunal succession provides a biostratigraphic framework for the Hunter Creek Sandstone that corroborates and is consistent with the previous chronostratigraphy based on radioisotopic and tephrochronologic dating methods.