Brazos River Formation

Brazos River Formation
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