Pleistocene Horse Molars

Two adjoining associated upper pre molars from an early equus (horse) yarmouth interglacial Pleistocene of Nebraska. The equus species is believed to have evolved from early North American horse species which migrated to Asia and Europe and subsequently migrated back into North American across the Bering straights during the mid Pleistocene era. The oldest fossils of equus have been found in Asia and Europe.These fossils are completely mineralized and probably date in excess of 200,000 years.
The fossil beds adjoining the Niobrara River of Nebraska contain a wealthy of mid Pleistocene mammal fossils.