There are at least five genera of Entelodonts: Archaeotherium, Megachoerus, Dinohyus, Entelodon and Eoentelodon. Entelodonts represent an extinct family of even toes mammals, and their remains are known from North America, Europe and Asia. They varied in size from a large dog to a large buffalo, and probably averaged cow sized. In North America, the family ranged from the Late Eocene to the Early Miocene, or about 39 to 16 million years ago. Entelodonts occur in twelve states, the greatest numbers found in South Dakota, Nebraska, Wyoming and Colorado.
Xiphactinus audax, Cretaceous fish jaw
Partial upper jaw of the Cretaceous fish Xiphactinus. Collected in the Gaylord, Kansas area. This fish attained the length of 14-16 feet and weighed 600-800 pounds.
Bibosphaesor daiuis, upper jaw.
Partial upper jaw of a Bibosphaesor daiuis (Water Buffalo). This animal lived during the Pleistocene Period. This jaw was recovered from the Trinil River, Java, Indonesia.
A small mollusk from the Pleistocene Period. Recovered from the Leisey Shell Pit, Ruskin, Florida.
The mollusk Oliva, is also called Olives. It ranges from the Cretaceous to Recent. The Recent shells are larger, have a thicker shell and a lower spire. This one was collected from the Leisey Shell Pit, Ruskin, Florida.