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Navarro and Taylor Groups, undivided

Navarro and Taylor Groups, undivided
State Texas
Name Navarro and Taylor Groups, undivided
Geologic age Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]
Comments On Austin Sheet (1974) in areas where Pecan Gap Chalk is not present because of gradation to marl similar to that of the Marlbrook and Ozan Formations. 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. Mapped on Sherman Sheet (1967) east of Sabine River. Taylor Group includes claystones of the Sprinkle Formation at base, chalk or marly limestones of the Pecan Gap Fm, and overlain by claystones of the Bergstrom Formation.
Primary rock type clay or mud
Secondary rock type fine-grained mixed clastic
Other rock types sandstone; limestone
Lithologic constituents
Major
Sedimentary > Clastic > Mixed-clastic > Siltstone-Mudstone (Bed)
Incidental
Sedimentary > Carbonate > Limestone (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 Bastrop - Milam - Travis - Williamson