Horse Jaw Section | South Dakota chalcedony Pietersite is a trade name

Pietersite is a trade name for a dark blue-grey breccia aggregate made up mainly of hawk's eye and tigereye

hand selected polished orthoceras (Cephalopod) fossil specimen measuring approx

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

Guggisberg

Horse Jaw Section | South Dakota chalcedony Pietersite is a trade nameMesohippus 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