Tahoka Formation (TXQta;0)

State	Texas
Name	Tahoka Formation
Geologic age	Phanerozoic \| Cenozoic \| Quaternary \| Pleistocene [Wisconsinan]
Original map label	Qta
Comments	Lacustrine clay, silt, sand, and gravel, coarser toward margins of deposits, locally calcareous, selenitic. Local thin dolostone beds. Clay and silt, sandy, indistinctly bedded to massive weakly coherent,various shades of lt.-gray and bluish-gray. Sand, fine- to coarse-grained quartz, indistinctly bedded to massive, friable, gray, grades to gravel at margins. Molluscan and vertebrate fossils. Thickness 25 ft.
Primary rock type	clay or mud
Secondary rock type	silt
Other rock types	sand; gravel
Lithologic constituents	Major Unconsolidated > Fine-detrital (Bed) Unconsolidated > Coarse-detrital > Sand (Bed) Minor Unconsolidated > Coarse-detrital > Gravel (Bed) Incidental Sedimentary > Carbonate > Dolostone (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, 1977, Clovis Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000. Bureau of Economic Geology, 1983, Lubbock Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000. Bureau of Economic Geology, 1976, Hobbs Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000.
Geographic coverage	Andrews - Bailey - Cochran - Crane - Dawson - Gaines - Garza - Glasscock - Hockley - Howard - Lamb - Lynn - Martin - Midland - Pecos - Reagan - Reeves - Scurry - Terry - Upton - Ward