|Name||Dakota and Purgatoir Formations, undivided|
|Geologic age||Early Cretaceous|
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Coal > Sub-bituminous (Bed)
|Comments||sandstone, brownish-yell., shale, gray, with coal beds, sandstone, quartzitic, ferruginous, pink, gray, white, black, brown-yell. Thickness about 200-350 ft. mapped only in very small areas in Dallum Co. (extreme NW corner of Texas Panhandle)|
Bureau of Economic Geology, 1984, Dalhart Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, 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.