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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Indian Peninsula
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India
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Deccan Plateau (1)
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Canada
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Eastern Canada
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Ontario
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Michipicoten Island (1)
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Chicxulub Crater (2)
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Europe
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Southern Europe
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Italy
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Apennines
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Central Apennines (1)
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North America
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Basin and Range Province (1)
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Keweenawan Rift (1)
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Lake Superior region (1)
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Williston Basin (3)
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Pacific Ocean
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North Pacific
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Northwest Pacific
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Pigafetta Basin (1)
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West Pacific
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Northwest Pacific
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Pigafetta Basin (1)
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United States
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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 (1)
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Minnesota
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Cook County Minnesota (1)
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Montana
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Garfield County Montana (1)
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McCone County Montana (1)
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Nevada (1)
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elements, isotopes
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halogens (1)
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isotope ratios (3)
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isotopes
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radioactive isotopes
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Ar-40/Ar-39 (2)
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stable isotopes
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Ar-40/Ar-39 (2)
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O-18/O-16 (1)
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noble gases
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argon
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Ar-40/Ar-39 (2)
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oxygen
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O-18/O-16 (1)
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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 (1)
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geochronology methods
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Ar/Ar (6)
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paleomagnetism (5)
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U/Pb (2)
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geologic age
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (1)
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Tertiary
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Paleogene
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Paleocene
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lower Paleocene
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K-T boundary (5)
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Tullock Member (2)
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Mesozoic
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Cretaceous
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Upper Cretaceous
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Hell Creek Formation (3)
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K-T boundary (5)
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Jurassic
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Middle Jurassic (1)
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Precambrian
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Nonesuch Shale (1)
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North Shore Volcanics (1)
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upper Precambrian
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Proterozoic
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Mesoproterozoic
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Freda Sandstone (1)
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igneous rocks
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igneous rocks
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plutonic rocks
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granites
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aplite (1)
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volcanic rocks
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andesites (1)
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basalts
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flood basalts (2)
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olivine tholeiite (1)
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pyroclastics
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tuff (1)
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rhyolites (1)
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metamorphic rocks
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metamorphic rocks (1)
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minerals
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silicates
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orthosilicates
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nesosilicates
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zircon group
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zircon (1)
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Primary terms
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absolute age (8)
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Asia
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Indian Peninsula
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India
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Deccan Plateau (1)
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Canada
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Eastern Canada
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Ontario
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Michipicoten Island (1)
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (1)
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-
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Tertiary
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Paleogene
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Paleocene
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lower Paleocene
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K-T boundary (5)
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Tullock Member (2)
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chemical analysis (1)
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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 (1)
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climate change (1)
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earthquakes (1)
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Europe
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Southern Europe
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Italy
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Apennines
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Central Apennines (1)
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geochronology (1)
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geomorphology (1)
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igneous rocks
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plutonic rocks
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granites
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aplite (1)
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-
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volcanic rocks
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andesites (1)
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basalts
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flood basalts (2)
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olivine tholeiite (1)
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pyroclastics
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tuff (1)
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rhyolites (1)
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intrusions (2)
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isotopes
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radioactive isotopes
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Ar-40/Ar-39 (2)
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stable isotopes
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Ar-40/Ar-39 (2)
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O-18/O-16 (1)
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Mesozoic
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Cretaceous
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Upper Cretaceous
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Hell Creek Formation (3)
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K-T boundary (5)
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Jurassic
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Middle Jurassic (1)
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-
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metamorphic rocks (1)
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noble gases
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argon
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Ar-40/Ar-39 (2)
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North America
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Basin and Range Province (1)
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Keweenawan Rift (1)
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Lake Superior region (1)
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Williston Basin (3)
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Ocean Drilling Program
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ODP Site 801 (1)
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oxygen
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O-18/O-16 (1)
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Pacific Ocean
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North Pacific
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Northwest Pacific
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Pigafetta Basin (1)
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West Pacific
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Northwest Pacific
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Pigafetta Basin (1)
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paleoclimatology (1)
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paleoecology (1)
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paleomagnetism (5)
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plate tectonics (1)
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Precambrian
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Nonesuch Shale (1)
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North Shore Volcanics (1)
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upper Precambrian
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Proterozoic
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Mesoproterozoic
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Freda Sandstone (1)
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sedimentary rocks (4)
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sedimentation (1)
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spectroscopy (1)
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United States
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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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-
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Midcontinent (1)
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Minnesota
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Cook County Minnesota (1)
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Montana
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Garfield County Montana (1)
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McCone County Montana (1)
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Nevada (1)
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rock formations
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Deccan Traps (3)
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Fort Union Formation (2)
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Jacobsville Sandstone (1)
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sedimentary rocks
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sedimentary rocks (4)
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Deccan volcanism at K-Pg time
ABSTRACT The last major mass extinctions in Earth history (e.g., end-Guadalupian, end-Permian, end-Triassic, and end-Cretaceous) are all correlated closely in time with the main-phase eruptions of major flood basalt provinces (Emeishan, Siberian, Central Atlantic Magmatic Province, and Deccan Traps, respectively). The causal relationship between flood volcanism and mass extinction is not clear, but likely involves the climate effects of outgassed volatile species such as CO 2 , SO 2 , Cl, F, etc., from some combination of magma and country rocks. In a surprising “coincidence,” the end-Cretaceous (K-Pg boundary) micro-faunal extinction also corresponds precisely in time to what may have been the largest meteor impact of the past billion years of Earth history, the Chicxulub crater at 66.05 Ma. The Deccan Traps eruptions were under way well before K-Pg/Chicxulub time and are most likely the result of the mantle plume “head” that initiated the presently active Reunion hotspot track—thus the Deccan Traps were clearly not generated, fundamentally, by the impact. However, recent high-precision 40 Ar/ 39 Ar geochronology indicates that conspicuous changes in basalt geochemistry, lava flow morphology, emplacement mode, and a possible 50% increase in eruption rate at the Lonavala/Wai subgroup transition in the Deccan Traps lava group corresponded, within radioisotopic age precision, to the K-Pg boundary and the Chicxulub impact. This has led to the testable hypothesis that the M w ~11 seismic disturbance of the Chicxulub impact may have affected the Deccan eruptions. Here we review a broad landscape of evidence regarding Deccan volcanism and its relation to the K-Pg boundary and attempt to define what we see as the most important questions than can and should be answered by further research to better understand both the onshore and largely unknown offshore components of Deccan-related volcanism, and what their climate and environmental impacts at K-Pg time may have been.