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Navarro Group, undivided

Navarro Group, undivided
State Texas
Name Navarro Group, undivided
Geologic age Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]
Comments Upper 250 ft, mostly silty, calcar. clay with sandst beds and concretionary masses near top, some interbeds of sandst. near base. Lower 200+- ft, quartz sand, fine grained, silty, locally calcar. concretions in discontin. beds, lt. gray; marine megafossils. On Sherman Sheet (1967) east of Sabine River.
Primary rock type clay or mud
Secondary rock type sand
Other rock types sandstone
Lithologic constituents
Unconsolidated > Fine-detrital > Clay (Bed)
Unconsolidated > Coarse-detrital > Sand (Bed)
Sedimentary > Clastic > Sandstone (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, 1967, Sherman Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000.
Counties Bowie - Delta - Franklin - Hopkins - Hunt - Lamar - Red River