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Vertebrate Fossils
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Eocene Chadron Megacerops
Megacerops sp.
Chadron Formation
White River Group
Late Eocene
Niobrara County, Wyoming
$1250
Oligocene Hyracodon
Hyracodon nebrascensis
Brule Formation
White River Group
Middle Oligocene
Shannon County, South Dakota
$40
Oligocene Oreodont Merycoidodon
Merycoidodon sp.
Brule Formation
Middle Oligocene
Niobrara County, Wyoming
$40