|Geologic age||Oligocene and Eocene|
Unconsolidated > Coarse-detrital > Sand (Bed)
Unconsolidated > Fine-detrital > Clay (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Siltstone (Bed)
|Comments||In north, central, and south Texas including Quaternary for all of west Texas- clay, sandstone, siltstone, and tuff. 205-325 ft thick. In East Texas and Gulf Coast to Rio Grande- Quartz sand, fine to med grained, tuffaceous, lignitic, argillaceous, locally silica cemented, lt. gray weathers dark gray. fossil wood abdt. Thickness 60 ft on Palistine Sheet (1967).|
|Stratigraphic units||(upper part) Fashing Clay Member, Calliham Sandstone Member, Dubose Clay Member, Deweesville Sandstone Member, (lower part) Conquista Clay Member,Conquista Clay Member, Dilworth Sandstone Member|
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, 1967, Palestine Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
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.
|Counties||Angelina - Atascosa - Brazos - Fayette - Gonzales - Grimes - Jasper - Karnes - Lavaca - Live Oak - McMullen - Polk - Trinity - Tyler - Walker - Washington - Wilson|