Palo Pinto and Mineral Wells Formations, undivided (TXPApm;0)

State	Texas
Name	Palo Pinto and Mineral Wells Formations, undivided
Geologic age	Phanerozoic \| Paleozoic \| Carboniferous Pennsylvanian-Late [Missouri]
Original map label	IPpm
Comments	Palo Pinto Formation--sandst., shale, and limestone. Thickness of upper part of formation is 70 to 100 ft in Wichita Falls-Lawton Sheet area. Wiles Ls. gray, fine- to coarse-grained, irreg. bedded, thin- to med.-bedded, bioclastic, algae common, thickness 1-4 ft. Shale gray, commonly calcareous, sev. sandst. lentils. Oran Sandstone tan and brn., fine- to med.-grained, ferruginous, locally crossbedded, channel-fill in lower part, massive upward, forms rounded bench, fossil plant frags common in lower part; Oran Ss as much as 30 ft thick. limestones ls6 to ls1--fine grained, in part bioclastic, massive, in part nodular, spred through 50-175 ft of section, all play out laterally. Mineral Wells Formation shale, sandst., conglomerate, and limestone. (top to bott.) Turkey Creek Sandstone coarse grained, locally chert conglo., crossbedded, massive, reddish brown, 10-50 ft thick. Sandstone ss2 fine to cs. grained, thin beds to massive, brown, 10-12 ft thick feathers out southwestward. Dog Bend Limestone one to four discontinuous ls. units separated by shale; ls fine grained, sl. argillaceous, lt gray, units 1-3 ft thick, locally grades to sandst. Lake Pinto Sandstone med to fine grained, locally conglomeratic, thick beds, brown, 20-50 ft thick. Village Bend Limestone fine grained, locally sandy, thick beds, yell-gray weathers to sm. blocks, marine megafossils, forms laterally distontinous lentils, up to 3 ft thick. Sandstone ss1 locally conglo., crops near Mineral Wells, Texas, about 30-40 ft thick, feathers out southwestward near Mineral Wells, Texas. Hog Mountain Sandstone fine to med grained, thick to flaggy beds, brown, about 25 ft thick. Thickness of exposed part of Mineral Wells Fm. 275-700 ft thick, thickest near Mineral Wells, Texas. overlapping Cretaceous rocks cover upper third and other parts of formation including Turkey Creek Sandstone and Dog Bend Limestone, which are exposed on Abilene Sheet.
Primary rock type	medium-grained mixed clastic
Secondary rock type	limestone
Other rock types	coal
Lithologic constituents	Major Sedimentary > Clastic > Mixed-clastic > Sandstone-Mudstone (Bed) Minor Sedimentary > Carbonate > Limestone (Bed) Incidental Sedimentary > Coal > Bituminous (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.