Nestled between two red beds of the upper Schnebly Hill Formation is a marine sequence consisting of a colorless gray and massively bedded limestone. The unit varies in thickness from about 100 feet at Fort Apache Arizona, and pinches out to zero west of Sedona. Most of these photos were taken in Sedona, where the thickness is approximately 10 to 20 feet. The Fort Apache Limestone is a Permian sequence representing a marine transgression onto the Schnebly Hill dunes which deposited a thin bed of limestone. Fossils are very scarce in this formation, in Strawberry for example, the massive beds visible on the north west end of town while driving north on Highway 87 are completely unfossiliferous. On the Indian reservation however, the typical Permian fossils are in abundance, including large brachiopods, sea urchin material, gastropods, and occasional cephalopods.