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Bathornis(?) (Phorusrhacid) Toe Bone, Brule Formation

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0.8" (2 cm) Bathornis Toe Bonefrom the Brule Formation of Custer County, South Dakota. 35-30 million years old. Bathornis was a large flightless birds probably related to phorusrhacids (Terror Birds). These are quite uncommon to find in the White River.