High gravel deposits

High gravel deposits
State Texas
Name High gravel deposits
Geologic age Pleistocene
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Gravel (Bed)
Minor
Unconsolidated > Coarse-detrital > Sand (Bed)
Incidental
Unconsolidated > Fine-detrital > Silt (Bed)
Comments In north, central, and south Texas including Quaternary for all of west Texas- gravel commonly exposed to the surface, in northwest part of Austin Sheet (1974) composed of an upper silty clay unit good for crop production and a lower coarse unit that yields some water (possibly correlates with the Onion Creek Marl). In Waco Sheet (1970) Caliche-cemented cobbles of chert as large as 5 inches in size, pebbles of variegated quartzite, limestone, chert, and quartz; thickness up to 10 ft. In East Texas and Gulf Coast to Rio Grande- in SE part of Austin Sheet (1974) gravel commonly exposed to the surface; northwestward, unit composed of an upper silty clay unit good for crop production and a lower coarse unit that yields some water (possibly correlates with the Onion Creek Marl). On Wichita Falls-Lawton Sheet (1987) unit is limestone gravel, sand, and silt; mostly gravel, sandy, silty, in part massive, large-scale crossbeds, mostly loosely consolid. to unconsolidated, locally well-indurated by fine-grained limestone; clasts granules to boulders chiefly ls. with minor quartzite, milky quartz, and sandst and mudstone. Locally in at least 2 topo levels, wedge-shaped in cross section. Thickness of limestone gravel 5-25 ft.
Stratigraphic units Onion Creek Marl(?)
References

Bureau of Economic Geology, 1974, Austin Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.

Bureau of Economic Geology, 1970, Waco Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.

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 Archer - Bastrop - Baylor - Bell - Brazos - Brown - Burleson - Coleman - Concho - Fayette - Gillespie - Hays - Irion - Lee - Leon - Limestone - McCulloch - McLennan - Madison - Milam - Robertson - Runnels - San Saba - Throckmorton - Tom Green - Travis - Washington - Williamson - Young