Age: Mesozoic (145 - 237 Ma)

Stratigraphic Name: Kayenta Formation; Wingate Sandstone; Chinle Formation

Description: Kayenta Fm: red siltstone, shale, and sandstone. Chinle Fm: red siltstone and sandstone

Lithology: Major:{siltstone,shale,sandstone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Age: Mesozoic (174.1 - 237 Ma)

Lithology: Sandstone-conglomerate

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Age: Early Jurassic (174.1 - 201.3 Ma)

Stratigraphic Name: Navajo Sandstone

Description: limestone beds in Navajo Sandstone: Pale-yellowish-gray, very light-brown, and pinkish gray, fine- to medium-grained, massive, cross-bedded sandstone; grains are subrounded to subangular, wellsorted and equant, frosted quartz; conspicuously crossbedded with cross-bed sets that range from 1.5 to 7.5 meters (5-25 ft) in thickness; contains sparse thin lenses of gray sandy limestone and, near the base, lenses of reddish-brown siltstone; lower contact gradational and intertonguing; forms rounded knobs, buttes, and mesa rims marked by a checkered pattern of grooved cross-strata and weathering joints; 24 to 150 meters (80-500 ft) thick, thinning eastward; Lower Jurassic.

Reference: Doelling, H.H. Geologic map of the La Sal 30'x60'quadrangle, San Juan, Wayne, and Garfield Counties, Utah and Montrose and San Miguel Counties, Colorado. Utah Geological Survey. [31]