|Geologic age||Late Cretaceous; Gulfian Series|
Sedimentary > Clastic > Sandstone (Glauconitic)
Sedimentary > Clastic > Mixed-clastic > Siltstone-mudstone (Bed)
|Comments||Quartz sand grading west to clay. Sand, v. fine grained to fine grained, calcar, glauconitic, ferruginous, calcar concretions and septaria, thin clay interbeds, brown. Clay, silty, calcareous, interbeds of silt; marine megafossils scarce. Thickness 20 ft. feathers out west in Fannin Co.|
Bureau of Economic Geology, 1967, Sherman Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, 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||Fannin - Lamar - Red River|