Clear Fork Group (TXPcf;0)

State	Texas
Name	Clear Fork Group
Geologic age	Phanerozoic \| Paleozoic \| Permian [Leonard]
Original map label	Pcf
Comments	Mudstone, siltstone, sandstone, dolomite, limestone, and gypsum. Mostly mudst, commonly silty, brownish-red, minor gray, calcar. nodules abdt in lower part, vertebrate fossils locally common. Siltst in units 1-3 ft thick throughout, locally dolomitic in upper part of map unit. Sandst. reddish-brn v. fine grained to fine-grained, locally conglomeratic, crossbedded, lenticular and thin-bedded as channel fill. Dolomite in units 2 inches to 1 foot thick mostly in upper third of Clear Fork Group. Limestone gray in thin discontin. beds in lower part. Gypsum white satin spar and alabaster as thin lenses and veins in uppermost part. Thickness of Clear Fork Grp 1,200-1,400 ft
Primary rock type	mudstone
Secondary rock type	sandstone
Other rock types	dolostone (dolomite); siltstone; evaporite
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Claystone (Bed) Incidental Sedimentary > Chemical > Evaporite > Gypsum (Bed) Sedimentary > Carbonate > Limestone (Bed) Sedimentary > Carbonate > Dolostone (Bed) Sedimentary > Clastic > Sandstone (Bed) Sedimentary > Clastic > Siltstone (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, 1987, Wichita Falls-Lawton Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000.
Geographic coverage	Baylor - Coke - Coleman - Concho - Foard - Hardeman - Haskell - Jones - King - Knox - Nolan - Runnels - Shackelford - Stonewall - Taylor - Throckmorton - Tom Green - Wichita - Wilbarger