|Geologic age||Early Pennsylvanian|
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
|Comments||Mostly granular, somehwhat sandy, cherty, gray, moderately thick beds; other beds aphanitic, very bituminous; to the east, much shale in upper and lower parts; thickness 300-1,000 ft. around the Marathon area, Brewster and Pecos Counties.|
Bureau of Economic Geology, 1982, Fort Stockton Sheet, Geologic Atlas of Texas, 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||Brewster - Pecos - Presidio|