It preserves fossils dating back to the late Triassic period.

[1] The Baldy Hill Formation is a dark purple, reddish brown, or greenish gray silty to sandy mudstone with some fine-grained sandstone.

Its base is not exposed at the type section, but it is at least 35 meters (115 ft).

[4] Fossils of amphibians and phytosaurs of Carnian to Norian age have been found in the Cobert Canyon Sandstone.

[2] The formation was first named by Baldwin and Muehlberger in 1959, for exposures around Baldy Hill in the valley of the Dry Cimarron.