Archer City Formation (TXPac;0)

State	Texas
Name	Archer City Formation
Geologic age	Phanerozoic \| Paleozoic \| Permian [Wolfcamp]
Original map label	Pac
Comments	mudstone, sandstone, siltstone, and conglomerate. 350-400 ft thick. Stratotype 5 mi SE Archer City, TX. Mostly reddish-brown mudst. exposed below cuesta-forming ss. Nine conglomeratic sandstone members separated by 10-50 ft of yell-brn and reddish-brn mudstone in Montague and eastern Clay Cos. Mudst thickens west. Calcar nodules and some siltstone.
Primary rock type	mudstone
Secondary rock type	sandstone
Other rock types	siltstone; conglomerate
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed) Minor Sedimentary > Clastic > Siltstone (Bed) Sedimentary > Clastic > Conglomerate (Bed) Sedimentary > Clastic > Sandstone (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	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. 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	Archer - Baylor - Clay - Montague - Throckmorton - Young