Horse Jaw Section | South Dakota chalcedony It was a typical large

It was a typical large theropod

The mine comprises three open-cut pits including "Big Pit"

and skeletal structure

Their evolutionary history indicates a close relationship with both marine ancestors and other freshwater-adapted crabs

hand selected polished orthoceras (Cephalopod) fossil specimen measuring approx

Horse Jaw Section | South Dakota chalcedony It was a typical largeMesohippus sp. Oligocene (33 30 MYO) Brule Formation White River Badlands South Dakota Specimen approx. size: 1. 25" x 1" x 0. 5" Mesohippus is a genus of extinct early horse that lived during the late Eocene to early Oligocene epochs, approximately 37 to 30 million years ago. Its fossils are primarily found in North America, particularly in the White River Formation of the western United States. As a transitional form in equid evolution, Mesohippus