|Name||Gober Chalk and Roxton Limestone|
|Geologic age||Late Cretaceous; Gulfian Series|
Sedimentary > Carbonate > Limestone > Chalk (Bed)
|Comments||Chalk with local Roxton Limestone beds. Gober Chalk argillaceous, brittle, bluish gray; weathers white; thickness 400 +- ft, thins eastward. Roxton Ls sandy, glauconitic, soft, tough, red; marine megafossisl; thickness 10 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||Collin - Fannin - Grayson - Hunt - Lamar|