when did horses first come to north america
Horses in the United States Fossils of the earliest direct ancestor to the modern horse, Eohippus have been found in the Eocene layers of North American strata, mainly in the Wind River basin in Wyoming.[4] Fossils found at the Hagerman Fossil Beds in Idaho, called the Hagerman horse or Equus simplicidens are from the Pliocene, dating to about 3.5 million years ago (mya). Paleontologists determined the fossils represented the oldest remains of the genus Equus.[5] The genus Equus, which includes all extant equines, was plentiful in North America and spread into the Old World by about 2.5 mya.[6]