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Georgetown Limestone

Georgetown Limestone
State Texas
Name Georgetown Limestone
Geologic age Phanerozoic | Mesozoic | Cretaceous-Early
Comments Georgetown Limestone--limestone and marl; mostly limestone, fine grained, argillaceous, nodular, mod indurated, lt gray; some ls brittle and thick bedded, white; some shale, marly, soft, marine megafossils include Kingena wacoensis and Gryphaea washitaensis; thickness 30-80 ft in Austin Sheet (1974) thins southward to 10-45 ft in Seguin Sheet (1974).
Primary rock type limestone
Secondary rock type mudstone
Other rock types
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Carbonate > Marlstone (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, 1974, Seguin Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.
Bureau of Economic Geology, 1974, Austin Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.
Counties Bell - Williamson