Named as one of four members of Redwall Limestone in the Grand Canyon, AZ in the Plateau sedimentary province. Type section is at Mooney Falls, Havasu Canyon, Grand Canyon, AZ. [Not precisely located.] Consists of pure limestone and dolomite. Forms a sheer cliff. Ranges from 200 to more than 350 ft thick. Unconformably overlies Thunder Springs Member (new) of Redwall. Contains corals and endothyrids. Assigned to the Mississippian.

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

The name Redwall Limestone of Early and Late Mississippian age is extended northward from AZ into Kane Co, UT in the Plateau sedimentary province. Redwall unconformably overlies the Upper Devonian and Lower Mississippian Ouray? Limestone and unconformably underlies the Lower Pennsylvanian Molas Formation. The formation is divided in three parts (ascending): 1) Whitmore Wash and Thunder Springs Members, 232 ft thick; 2) Mooney Falls Member, 289 ft thick; and 3) Horseshoe Mesa Member, 160 ft thick. The Whitmore Wash and Thunder Springs are white, fossiliferous dolomite with white tripolitic chert. The Mooney Falls is a white to brown, crinoidal, cherty dolomite with a few thin brown limestone beds. The Horseshoe Mesa is a brown to white limestone with chert, and algal structures. The Early-Late Mississippian boundary lies within Mooney Falls Member. A marine deposit.

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