The Siltstone Member was part of the Chinle Formation in New Mexico. It dates back to the Rhaetian in the Late Triassic. Paleobiota
Fish
Synorichthys, a small fish of redfieldiidae
Chinlea, a coelacanth
Rhynchocephalians
Whitakersaurus, a tuatara
Archosaurs
Coelophysis bauri