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Wilcox Group, undivided

Wilcox Group, undivided
State Texas
Name Wilcox Group, undivided
Geologic age Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene
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.
Counties Anderson - Atascosa - Bexar - Bowie - Caldwell - Camp - Cass - Cherokee - Franklin - Freestone - Gonzales - Guadalupe - Harrison - Henderson - Hopkins - Kaufman - Marion - Medina - Milam - Morris - Nacogdoches - Navarro - Panola - Rains - Rusk - Sabine - San Augustine - Shelby - Titus - Uvalde - Van Zandt - Wilson - Wood