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GeoRef Subject
Famennian asteroids Cretaceous Cenozoic Chordata Chicxulub Crater isotopes meteorites lower Paleocene dinosaurs Frasnian K-T boundary stable isotopes paleoecology Permian Tetrapoda Upper Devonian Paleogene Paleozoic Reptilia Phanerozoic Yucatan Peninsula Tertiary reefs Upper Cretaceous Triassic Vertebrata Devonian Mammalia Mesozoic Mexico Paleocene Plantae
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