This specimen is an incredible collection of jaw bones and teeth fossils dating to the Permian Period that is estimated to be around 286,000,000 years old. This chapter in life's evolutionary history marked the rise of amniotes, egg-laying animals that came to dominate the surface of the Earth long before the dinosaurs.

Each specimen contains six pieces of bone material from a small tetrapod found in the Richards Spur Quarry near Lawton, Oklahoma. The majority of these fossils from from Captorhinus, a reptile common in the Permian deposit.