Wilcox Group, undivided (TXEOPNwi;0)

State	Texas
Name	Wilcox Group, undivided
Geologic age	Phanerozoic \| Cenozoic \| Tertiary \| Paleocene Eocene
Original map label	EPAwi
Comments	Mostly mudstone, with various amounts of sandst., lignite, ironstone concretions, glauconitic; thickness about 1,000 ft. sand, mudst., clay, mudst. conglo., thickness as much as 300 ft. lower part mostly mudstone, thickness about 500 +- ft. Total thickness roughly 1,400-1,800 ft.
Primary rock type	fine-grained mixed clastic
Secondary rock type	coal
Other rock types	sand; clay or mud
Lithologic constituents	Major Sedimentary > Clastic > Mudstone (Glauconitic) Minor Sedimentary > Clastic > Mixed-clastic > Conglomerate-sandstone (Bed) Incidental Sedimentary > Coal > Lignite (Bed)
Map 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
Unit references	Bureau of Economic Geology, 1974, Austin Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000. Bureau of Economic Geology, 1974, San Antonio Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000. Bureau of Economic Geology, 1974, Seguin Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000. Bureau of Economic Geology, 1972, Dallas sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Geographic coverage	Anderson - Atascosa - Bastrop - Bexar - Bowie - Caldwell - Camp - Cass - Cherokee - Franklin - Freestone - Gonzales - Guadalupe - Harrison - Henderson - Hopkins - Kaufman - Marion - Medina - Milam - Morris - Nacogdoches - Navarro - Panola - Rains - Robertson - Rusk - Sabine - San Augustine - Shelby - Smith - Titus - Uvalde - Van Zandt - Wilson - Wood