|Geologic age||Pennsylvanian; Middle and Late|
Sedimentary > Clastic > Mixed-clastic > Conglomerate-sandstone (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)
|Comments||Alternating beds of quartz pebble conglomerate, ferruginous sandst., sandy shale, and brecciated masses of reef Limestone; ss fine grain, muscovitic, irreg bedding; ls in part locally derived limestone-pebble conglo. in part contains pebbles of vein quartz; some blk shale metamorphosed to hornfels; thickness more than 2,000 ft; exposed in no. part of Chinati Mtns.|
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.