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Alluvium in Rio Grande, subdivided into areas predominantly of sand

Alluvium in Rio Grande, subdivided into areas predominantly of sand
State Texas
Name Alluvium in Rio Grande, subdivided into areas predominantly of sand
Geologic age Phanerozoic | Cenozoic | Quaternary | Holocene
Comments Point-bar and distributary sand and silt--yellowish-gray or brownish-gray quartz sand and silt; contains plant debris and some biotite. Accretionary point-bar, levee, and crevasse-splay deposits formed by distributary channels on the Rio Grande delta. Point-bar deposits grade upward from corssbedded basal sandy gravel and coarse sand to silt and fine sand and locally are as thick as 12 m (Moore and Wermund, 1993b).
Primary rock type sand
Secondary rock type silt
Other rock types
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Silt (Fluvial)
Unconsolidated > Coarse-detrital > Sand (Fluvial)
Minor
Unconsolidated > Coarse-detrital > Gravel (Fluvial)
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
Moore, D.W. and Wermund, E.G., Jr., 1993b, Quaternary geologic map of the Monterrey 4 x 6 degree quadrangle, United States: U.S. Geological Survey Miscellaneous Investigations Series Map I-1420 (NG-14), scale 1:1,000,000.
Counties Cameron - Hidalgo