Buda Limestone and Del Rio Clay, undivided

Buda Limestone and Del Rio Clay, undivided; Eastern part of Trans-Pecos and High Plains and Western part of Trans-Pecos and North, central, and south Texas including Quaternary for all of west Texas.
State Texas
Name Buda Limestone and Del Rio Clay, undivided
Geologic age Late Cretaceous
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)
Minor
Sedimentary > Clastic > Mudstone > Claystone (Bed)
Sedimentary > Carbonate > Marlstone (Bed)
Incidental
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Siltstone (Bed)
Comments In Eastern part of Trans-Pecos and High Plains-Buda Ls--Limestone, fine grained, bioclastic, commonly glauconitic, pyrite, hard, massive lt gray to pale orange; formation is as much as 45 ft thick. Del Rio Clay--Clay, calcar. to gypsiferous, pyrite common, blocky, med gray, weathers lt gray to lt yell-gray, contains lenses of calcar siltst., marine megafossils include abdt Exogyra arietina and other pelecypods; thickness 40-70 ft. In Western part of Trans-Pecos Texas- Buda Ls--upper part-- thin to thick beds, resistant, few chert nodules; middle--interbedded gray ls, marl, and calc shale, limonite nodules; lower--fossilif., aphanitic ls, thin to thick beds; formation is 200-350 ft thick. Del Rio Clay--lt gray to lt yell-gray marl interbedded with clayey lt gray, nodular ls. thickness 87 ft.
References

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

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, 1977, Del Rio Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.

Bureau of Economic Geology, 1981, Llano sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, 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 Bell - Bexar - Brewster - Comal - Edwards - Hays - Hudspeth - Kerr - Kimble - Medina - Presidio - Real - Sutton - Terrell - Uvalde - Val Verde - Williamson