|Geologic age||Late Triassic|
Sedimentary > Clastic > Mixed-clastic > Siltstone-mudstone (Bed)
|Comments||Shale, clay, siltstone, and sand. Shale, clay, siltst. sandy in places, micaceous, calcareous locally, reddish-brown, various shades of red, maroon, gray, greenish-gray, yellow, and purple. Sand, fine to med-grained quartz; locally large petrified logs, unconsolidated, massive, lenticular, white, lt-gray. Thickness of formation 125 ft.|
Bureau of Economic Geology, 1983, Tucumcari Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Bureau of Economic Geology, 1992, Geologic Map of Texas: University of Texas at Austin, Virgil E. Barnes, project supervisor, Hartmann, B.M. and Scranton, D.F., cartography, scale 1:500,000.
|Counties||Hartley - Moore - Oldham - Potter|