|Geologic age||Pennsylvanian; Missouri Series|
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)
|Comments||two limestones separated by shale. Upper ls gray and tan, fine to cs-grained, bioclastic, planar and irregular, thin to med beds, thickness 2-8 ft. Shale, silty, locally calcar., lt brn and gray, ferrug. concretions throughout, some thin ss lentils, thickness 6-25 ft. Lower ls. tan, gray, yell, fine to cs-grains, local sandy and conglo. with clasts of angular ls and fossil frags, massive, thin beds, nodular, sparse chert nodules, locally contains brachiopods and bryozoans, thickness 2-25 ft. In SW Jack Co, unit is single ls 50-60 ft thick.|
|Stratigraphic units||Canyon Group|
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||Jack - Wise|