Cienequita Formation

Cienequita Formation
State Texas
Name Cienequita Formation
Geologic age Pennsylvanian; Middle and Late
Lithologic constituents
Major
Sedimentary > Clastic > Mixed-clastic > Conglomerate-sandstone (Bed)
Minor
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Incidental
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.
References

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.

NGMDB product
Counties Presidio