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Weches Formation

Weches Formation
State Texas
Name Weches Formation
Geologic age Phanerozoic | Cenozoic | Tertiary | Eocene
Comments In north, central, and south Texas including Quaternary for all of west Texas- greensand, sand, and clay; thickness 30 +- ft. In East Texas and Gulf Coast to Rio Grande- Quartz sand, glaconitic sand, and clay interbeds. grayish green to grayish olive green, thinbedded, locally crossbedded to lenticular. Clay interbeds, lt. brown to mod. lt. gray, silty, moscovitic, thinbedded; weathers mod. to dk. reddish brown; local ironstone concretions; marine megafossils in southern part of Tyler Sheet. 35+-ft thick, range 0-70 ft.
Primary rock type sand
Secondary rock type clay or mud
Other rock types
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)
Minor
Sedimentary > Clastic > Mudstone > Claystone (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, 1976, Crystal City-Eagle Pass Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.
Bureau of Economic Geology, 1974, Seguin Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.
Bureau of Economic Geology, 1974, San Antonio Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.
Bureau of Economic Geology, 1966, Texarkana Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.
Bureau of Economic Geology, 1965, Tyler sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Bureau of Economic Geology, 1967, Palestine Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Counties Anderson - Atascosa - Bastrop - Burleson - Camp - Cass - Cherokee - Fayette - Frio - Gonzales - Gregg - Harrison - Henderson - Houston - Lee - Leon - Marion - Milam - Morris - Nacogdoches - Panola - Robertson - Rusk - Sabine - San Augustine - Shelby - Smith - Upshur - Van Zandt - Wilson - Wood