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GeoRef Subject
calcite Carnivora carbonates clastic rocks Equidae Miocene Hippomorpha Mammalia Nebraska Aves Box Butte County Nebraska Cenozoic fractures Theria Rodentia weathering lower Miocene Neogene Chordata siltstone Arikaree Group Arikareean Artiodactyla Eutheria United States Vertebrata Perissodactyla sandstone Sioux County Nebraska Tertiary sedimentary rocks structural analysis Tetrapoda
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