Nocona Formation (TXPn;0)

State	Texas
Name	Nocona Formation
Geologic age	Phanerozoic \| Paleozoic \| Permian [Wolfcamp Leonard]
Original map label	Pn
Comments	Mudstone, sandstone, siltstone, and conglomerate. Mainly red-brown, locally gray or variegated mudstone that has vertebrate and plant fossils, calcareous nodules. Includes laminated tan to dk-brown, sandstone, fine to very coarse grained, locally conglomeratic (chert clasts) and siltstone in sheets and lentils 1-3 ft thick. Thicker sandst beds have large scale crossbedding, soft-sediment deformation. Lenticular calcar-nodule conglomerate common. Formation 280-350 ft thick.
Primary rock type	mudstone
Secondary rock type	sandstone
Other rock types	conglomerate
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Claystone (Bed) Minor Sedimentary > Clastic > Sandstone (Bed) Incidental Sedimentary > Clastic > Conglomerate (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. Hentz, T., 1988, Lithostratigraphy and paleoenvironments of upper Paleozoic continental red beds, north-central Texas: Bowie (new) and Wichita (revised) Groups: Texas Bureau of Economic Geology, Report of Investigations 170.
Geographic coverage	Archer - Baylor - Clay - Montague - Wichita