Oreodont
(Leptauchenia nitida)

Here are the fossils of an oreodont I found in the plains of northeastern Colorado back in 1971 or so. I had a rock pick and was digging in the side of an arroyo when I uncovered these fossils.

The fossils were brought to the Denver Museum of Natural History (as it was called back then) for identification and we were told they were part of an oreodont, which was boar-like animal the size of a small horse.