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Seymour Formation

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Seymour Formation
State Texas
Name Seymour Formation
Geologic age Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle [Irvingtonian]
Comments 1) thin deposits--sand, silty, orange-brown, massive; locally thin, granule to pebble gravel in basal part.; thin deposits 1-10 ft thick 2) thick deposits --mostly sand, silty, orange-brown to red, thick bedded, massive, locally crossbedded; minor lenses of clay containing fresh-water mollusks; well developed caliche near surface as much as 5 ft thick; basal gravel 1-15 ft thick granules to boulders. fossil vertebrates scarce. Unit contains Lava Creek B volcanic ash. thick deposits 10-75 ft thick
Primary rock type sand
Secondary rock type gravel
Other rock types clay or mud
Lithologic constituents
Incidental
Sedimentary > Clastic > Conglomerate (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, 1987, Wichita Falls-Lawton Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000.
Counties Baylor - Coke - Fisher - Foard - Haskell - Jones - Knox - Nolan - Runnels - Shackelford - Taylor - Throckmorton - Wilbarger