Tule Formation (TXQtu;0)

State	Texas
Name	Tule Formation
Geologic age	Phanerozoic \| Cenozoic \| Quaternary \| Pleistocene
Original map label	Qtu
Comments	Sand, fine- to med-grained quartz, silty in part, some caliche nodules, thinbedded to massive, white, gray, brownish gray, grayish red. Silt and clay, locally bentonitic, indistinctly bedded, lt. gray, olive gray, greenish gray; weathers white, lt. gray, pink. Molluscan and vertebrate fossils. Thickness 85 ft. feathers out laterally.
Primary rock type	sand
Secondary rock type	silt
Other rock types	clay or mud
Lithologic constituents	Major Unconsolidated > Coarse-detrital > Sand (Bed) Minor Unconsolidated > Fine-detrital > Silt (Bed) Incidental Unconsolidated > Fine-detrital > Clay (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, 1983, Lubbock Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000.
Geographic coverage	Briscoe - Garza - Lynn - Swisher