Carizzo Sand (TXEOc;0)

State	Texas
Name	Carizzo Sand
Geologic age	Phanerozoic \| Cenozoic \| Tertiary \| Eocene
Original map label	Ec
Comments	sandstone, medium to v. coarse grained up to size of rice, finer grained toward top, poorly sorted, friable to locally cemented, noncalcar., thick beds, lt. yell. to orange and brn, iron-oxide banded, makes ridges thickly covered with oak in east San Antonio Sheet (1974); thickness about 140-200 ft, thickens westward.
Primary rock type	sandstone
Secondary rock type
Other rock types
Lithologic constituents	Major Sedimentary > Clastic > Sandstone (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. Eargle, D.H., 1968, Nomenclature of formations of Claiborne Group, Middle Eocene, coastal plain of Texas: U.S. Geological Survey Bulletin 1251-D. [http://pubs.er.usgs.gov/publication/b1251D] Bureau of Economic Geology, 1976, Crystal City-Eagle Pass Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.
Geographic coverage	Anderson - Atascosa - Bastrop - Bexar - Caldwell - Camp - Cherokee - Dimmit - Franklin - Freestone - Frio - Gonzales - Gregg - Guadalupe - Harrison - Henderson - Hopkins - Lee - Leon - Maverick - Medina - Milam - Morris - Nacogdoches - Panola - Robertson - Rusk - Sabine - San Augustine - Shelby - Smith - Titus - Upshur - Uvalde - Van Zandt - Webb - Wilson - Wood - Zavala