The Muav Limestone forms cliffs or small ledges that weather a dark gray or rusty-orange color.

lying between the underlying Bright Angel Shale and either discontinuous lenses of overlying Devonian beds or base of the Redwall Limestone.

Later in 1945, E. D. McKee and C. E. Resser[9] removed subdivision A of L F. Noble from both the Muav Limestone and the Tonto Group and assigned it to an informal geologic unit called the Cambrian undifferentiated dolomites.

[9] Finally, S. M. Rowland and others[1][10] formally named the Cambrian undifferentiated dolomites as the Frenchman Mountain Dolostone and restored it to the Tonto Group.

Discontinuous lenses of Devonian Temple Butte Formation fill deep paleovalleys that have been cut into and occasionally through the Frenchman Mountain Dolostone and into the Muav Limestone.

In addition, to trilobites, the Muav Limestone contains enigmatic body fossils such as hyoliths; the single-shelled, mollusk Helcionella; Scenella hermitensis; and Chancelloria.

[2][11] Although trace fossils are common in the Muav Limestone, they are less abundant than those found in the underlying Bright Angel Shale.

[13] It is currently accepted that the Muav Limestone accumulated in an offshore marine environment during a series of at least five transgressive and regressive events.