12.7" Titanothere (Megacerops) Upper Jaw - South Dakota

This is a 12.7" long upper jaw of a massive Titanothere, a Rhinoceros-looking animal that lived during the Late Eocene. It was collected from the Eocene aged Chadron Formation of South Dakota. There are three molars present in the jaw. Upper jaws tend to be much more desirable among collectors than the lower jaws because the molars are much wider and just generally more massive.

Some of the teeth have undergone restoration to the dark enamel. The deep-brown/black spots on these teeth are locations where restoration has occurred and are best viewed under longwave UV light. Portions of this specimen have also undergone gap fill in cracks and around one side of the teeth to assist with structural integrity of the entire jaw. The teeth have not been remounted like some jaw sections from this location.

Artists reconstruction of a Titanothere.  By Nobu Tamura (http://spinops.blogspot.com)
Artists reconstruction of a Titanothere. By Nobu Tamura (http://spinops.blogspot.com)

Titanothere's are an extinct, massive mammal that lived during the Eocene. While the very closely resembled a Rhinoceros, they were more closely related to modern day horses. They first appeared 54 million years ago and went extinct at the end of the Eocene, 34 million years ago. The same genus has been described several times under different names Brontotherium, Titanotherium, Brontops, etc.., though Megacerops was the first and therefore technically correct one.
Megacerops sp.
Pennington County, South Dakota
Chadron Formation
12.7" long
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