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Ector Chalk

Ector Chalk
State Texas
Name Ector Chalk
Geologic age Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]
Comments Basal unit in Austin Group in northeast Texas, 10 mi SE of Denison in Grayson and Fannin Cos. Chalk, argillaceous, brittle, light gray; weathers white; thickness 35 ft. feathers out eastward in Fannin County.
Primary rock type limestone
Secondary rock type
Other rock types
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone > Chalk (Bed)Chalk.
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 Fannin - Grayson