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Indio Formation

Indio Formation
State Texas
Name Indio Formation
Geologic age Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene
Comments sandstone, shale, siltstone, and lignite; many calcareous and arenaceous concretions; thickness about 440 ft
Primary rock type fine-grained mixed clastic
Secondary rock type coal
Other rock types
Lithologic constituents
Major
Sedimentary > Clastic > Mixed-clastic > Sandstone-Mudstone (Bed)
Incidental
Sedimentary > Coal > Lignite (Bed)
Map references
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
Unit references
Bureau of Economic Geology, 1974, San Antonio Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.
Counties Dimmit - Maverick - Uvalde - Webb - Zavala