| State | Texas |
|---|---|
| Name | Harpersville Formation |
| Geologic age | Pennsylvanian; Virgil Series |
| Lithologic constituents |
Major
Sedimentary > Clastic > Mixed-clastic > Siltstone-mudstone (Bed)
Incidental
Sedimentary > Carbonate > Limestone (Bed)
|
| Comments | Mudst., sandst., and siltst. Mudstone gray, tan, maroon, locally silty and gypsiferous, thin, v.f. sandst. and siltst. beds throughout. Sandstone brown, fine to med grained, mudst clasts, chert pebbles locally, friable, mostly massive, 20-30 ft thick. Brekenridge Ls consists of up to 3 beds locally interbedded with thin shale; ls is gray to yell-brn, fine grained, sandy and clayey in lower part, sparsely fossiliferous, 1-3.5 ft thick. Includes Breckenridge Ls, 2-3 beds 0.5-1 ft thick interbedded with thin beds of shale. Ls is gray, fine-grained, sandy or clayey in lower part. |
| Stratigraphic units | Brekenridge Limestone, Cisco Group, Bowie Group (new) |
| 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.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. |
| NGMDB product | |
| Counties | Brown - Coleman - Eastland - McCulloch - Stephens - Throckmorton - Young |