Sunday, November 29, 2009

Shark Protolamna sokolovi

A late Cretaceous Period (about 112 million years ago) fossil tooth of the Protolamna sokolovi shark. This fossil is from the rare Lamnid shark. It was found in the Paw Paw Formation found in Tarrant County, Texas.

Crowns feature deep longitudinal grooves at the base.

Thanks to Herb for the image.