Daeodon humerosum,
Haystack Valley, 20 Ma - -
This is the upper portion of the forelimb of a large entelodont. This specimen from the John Day Fossil Beds was described by Cope in 1879. The radius is fused to the much larger ulna, like an ox, so the limb could not rotate.
U.S. National Park Service
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John Day Fossil Beds National Monument, Code: JODA
John Day Fossil Beds National Monument, Oregon Latitude: 44.5381088256836, Longitude: -119.649200439453