It preserves fossils dating back to the Leonardian Age of the Permian Period.

[1] The formation consists of light gray limestone and dolomite[1] The total thickness over 1,000 meters (3,300 ft).

[1] The formation grades laterally to the southeast into the Bone Spring Formation, representing the change from shallow shelf carbonate deposition to deep marine carbonate deposition.

[3][4] The formation contains fossil brachiopods, include Productus ivesii,[5] Dichtyoclostus, and Neospirifer, fusulinids such as Parafusilina, crinoids, corals, and euomphalid gastropods[6] characteristic of the Leonardian.

[5] It was reassigned as the Victorio Peak Member of the Bone Spring Formation by King in 1942,[2] and finally removed as its own formation by Hay-Roe in 1957.