Folded rocks of the Shnabkaib Member (Trms) of the Triassic Moenkopi Formation exposed in the St. George Basin of northern-most Arizona. The Dutchman Draw Fault (green line) and the syncline (red, --><--), and anticline (red, <-- -->) are from George Billingsley’s geologic map of the Rock Canyon Quadrangle (1992). Billingsley’s describes the Shnabkaib Member as “interbedded, white, laminated, aphanitic dolomite and silty gypsum. Includes thin red beds of mudstone, siltstone and sandstone in lower and extreme upper parts. Gradational contact with middle red member placed arbitrarily at lowest, white, thick siltstone bed. Forms steep slope with ledges. Thickness as much as 107 m (350 ft).”
Billingsley, 1992, Geologic map of the Rock Canyon Quadrangle, northern Mohave County, Arizona
https://pubs.er.usgs.gov/publication/ofr92449
