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Mineral Resources On-Line Spatial Data

Alluvium in Rio Grande, subdivided into areas predominantly of sand

Alluvium in Rio Grande, subdivided into areas predominantly of sand
StateTexas
NameAlluvium in Rio Grande, subdivided into areas predominantly of sand
Geologic agePhanerozoic | Cenozoic | Quaternary | Holocene
Original map labelQas
CommentsPoint-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 typesand
Secondary rock typesilt
Other rock types
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Sand (Fluvial)
Unconsolidated > Fine-detrital > Silt (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.
Geographic coverageCameron - Hidalgo

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