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Beaumont Formation, areas predominantly clay

Beaumont Formation, areas predominantly clay
StateTexas
NameBeaumont Formation, areas predominantly clay
Geologic agePhanerozoic | Cenozoic | Quaternary | Pleistocene-Late
Original map labelQbc
CommentsOn McAllen-Brownsville Sheet (1976) dominantly clay and mud of low permeability. (from Moore and Wermund, 1993a, 1993b): Light- to dark-gray and bluish- to greenish-gray clay and silt, intermixed and interbedded; contains beds and lenses of fine sand, decayed organic matter, and many buried organic-rich, oxidized soil(?) zones that contain calcareous and ferruginous nodules. Very lt. gray to v. lt. yell-gray sediment cemented by calcium carbonate present in varied forms, veins, laminar zones, burrows, root casts, nodules. Locally, small gypsum crystals present. Includes plastic and compressible clay and mud deposited in flood basins, coastal lakes, and former stream channels on a deltaic plain. Disconformably overlies Lissie Fm. Thickness 5-10 m along north edge of outcrop; thickens southward in subsurface to more than 100 m.
Primary rock typeclay or mud
Secondary rock typesilt
Other rock types
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Silt (Bed)
Unconsolidated > Fine-detrital > Clay (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, 1975, Corpus Christi Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Moore, D.W. and Wermund, E.G., Jr., 1993a, Quaternary geologic map of the Austin 4 x 6 degree quadrangle, United States: U.S. Geological Survey Miscellaneous Investigations Series Map I-1420 (NH-14), scale 1:1,000,000.
Bureau of Economic Geology, 1976, McAllen-Brownsville Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Bureau of Economic Geology, 1975, Beeville-Bay City Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Bureau of Economic Geology, 1982, Houston Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Geographic coverageAransas - Austin - Bee - Brazoria - Calhoun - Cameron - Chambers - Colorado - Fort Bend - Galveston - Hardin - Harris - Hidalgo - Jackson - Jasper - Jefferson - Jim Wells - Kenedy - Kleberg - Liberty - Live Oak - Matagorda - Newton - Nueces - Orange - Refugio - San Patricio - Victoria - Waller - Wharton - Willacy

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