|Geologic age||Late Cretaceous; Gulfian Series|
Sedimentary > Clastic > Mudstone > Claystone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Coal > Lignite (Bed)
|Comments||clay, sandstone, coal, and fire clay; irreg. stratified, interfingering lenses of ss and clay, chief coal seam about 6 ft thic; poorly exposed unit; thickness 400-500 ft. Lower part of Navarro Grp.|
|Stratigraphic units||Navarro Group|
Bureau of Economic Geology, 1977, Del Rio Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.
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, 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.