Synthetoceras

Synthetoceras tricornatus is a large, extinct protoceratid, endemic to North America during the Late Miocene, 10.3—5.3 Ma, existing for approximately 5 million years. Fossils have been recovered from Nebraska and Texas.

Synthetoceras

Synthetoceras tricornatus is a large, extinct protoceratid, endemic to North America during the Late Miocene, 10.3—5.3 Ma, existing for approximately 5 million years. Fossils have been recovered from Nebraska and Texas.