|Geologic age||Early Cretaceous|
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone > Claystone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
|Comments||In Eastern part of Trans-Pecos and High Plains: Sand, clay, and conglomerate. Lower and upper parts mostly sand; middle part chiefly clay; grades northward to interbedded sand and clay. Sand, fine to cs. grained, conglomeratic in lower part, clayey in upper part, brownish-yellow. Conglomerate, chert, quartz, and quartzite as pebbles and granules. Thickness 500-650 ft. Sandstone, claystone, and conglomerate. Thickness as much as 200 ft, variable because of irreg. surface on which it was deposited.|
|Stratigraphic units||Trinity Sand, Hensell Sand|
Bureau of Economic Geology, 1967, Sherman Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000.
Bureau of Economic Geology, 1976, Brownwood sheet, Geologic Atlas of Texas, Bureau of Economic Geology, 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||Andrews - Brown - Callahan - Coke - Coleman - Comanche - Concho - Cooke - Denton - Eastland - Ector - Glasscock - Grayson - Howard - Irion - Jack - McCulloch - Martin - Mason - Menard - Midland - Mitchell - Montague - Nolan - Runnels - Stephens - Sterling - Taylor - Tom Green - Wise|