Named as the upper member of the Fremont formation for exposures in Priest Canyon, sec 13, T18S, R71W, its "typical" section," Fremont Co, CO. Measured sections. Gradationally overlies massive dolomite member of Fremont and unconformably underlies Williams Canyon formation at the Priest Canyon locality where it consists of basal 5 ft of white-mottled maroon, very finely laminated, fossiliferous (brachiopods, fish plates), very silty, dolomitic shale with irregular discoidal nodules of white chert in the upper part, and an overlying 70 ft of cream to pink, finely crystalline dolomite that is 15 to 20 percent fine silt and clay and that is fossiliferous in lower 5 ft. Basal shale is a 4 to 8 ft thick bed persistent in the Canon City area but is missing to west. Is 211 ft thick at Kerber Creek and is missing at Crestone, localities in Saguache Co, CO. Isopach map shows its presence in Pueblo, El Paso, Teller and Fremont (Denver basin), Custer (Las Vegas-Raton basin), Saguache (San Luis basin), Chaffee and Pitkin (Eagle basin), Gunnison (Piceance basin), and Park (South Park basin) Cos, CO. Maximum thickness is 300+ ft. Cross sections. Fossils (corals, brachiopods, pelecypods, gastropods, cephalopods, trilobites) found 10 to 15 ft above base listed. Of Richmond or Ordovician age.

Source: GNU records (USGS DDS-6; Denver GNULEX).

The uppermost Fremont Limestone that was designated Priest Canyon Member cannot be recognized consistently in the Canon City embayment area, Fremont Co, CO in the Denver basin. Term Priest Canyon not used.

Source: GNU records (USGS DDS-6; Denver GNULEX).