| State | Texas |
|---|---|
| Name | Brazos River Formation |
| Geologic age | Pennsylvanian; Des Moines Series |
| Lithologic constituents | Major
Sedimentary > Clastic > Sandstone (Bed)
|
| Comments | Sandstone, conglomerate, mudstone, sandstone, coarse-grained, ferruginous, cross bedded, thick bedded to massive, reddish brown. Local conglomerate lentils; mudstone, silty, gray, local lenses; conglomerate, angular pebbles of chert up to 1.5 inches in size, some clay ironstone, variegated, ferruginous cement common; thickness 100 ft in Dallas Sheet of Geologic Atlas of Texas, 100-200 ft thick in Abilene Sheet. A prominent ledge of thick, massive ss. that makes a striking escarpment. Named for exposures along Brazos River, esp. the high cliff at Inspiration Point, 8 mi east of Mineral Wells. Prominent escarpment between Gordon and Santo. Contains lenses of conglomerate. "Typical section" exposed 2.5 mi northwest of Millsap, Palo Pinto Co. |
| Stratigraphic units | Strawn Group |
| References | Plummer, F.B., and Moore, R.C., 1921, Stratigraphy of the Pennsylvanian formations of north-central Texas: University of Texas Bulletin 2132.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 | Comanche - Eastland - Erath - Palo Pinto - Parker |