Twin Mountains Formation

Twin Mountains Formation
State Texas
Name Twin Mountains Formation
Geologic age Early Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Claystone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Incidental
Sedimentary > Clastic > Conglomerate (Bed)
Comments Upper part mostly sandst., some clayst. and conglomerate. Middle part sandstone above claystone. Lower part mostly sandst., some clayst. and conglomerate. Thickness about 150 ft.
References

Bureau of Economic Geology, 1972, Dallas sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.

Bureau of Economic Geology, 1967, Sherman 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 - Comanche - Eastland - Erath - Hamilton - Hood - Jack - Palo Pinto - Parker - Somervell - Wise