Silt sheet

Silt sheet
State Texas
Name Silt sheet
Geologic age Holocene
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Sand (Bed)
Unconsolidated > Fine-detrital > Silt (Bed)
Comments silt and fine sand in thin, locally discontinuous sheet winnowed from other 'windblown deposits', brush and grass covered, rests on various Pleistocene deposits; pale brown, very pale orange, and west of about long 98 degree 15 min., moderate reddish-brown, moderate-brown, and light yellow-brown fine to very fine quartz sand and silt. Slightly clayey, loose, subangular to rounded; median grain diameter 0.14-0.17 mm (Russell, 1981). Grain size and thickness decrease westward; forms a thin discontinuous sheet of eolian silt (loess) downwind of Baffin Bay.
References

Russell, J.L., 1981, The south Texas eolian sand sheet, in Stelting, C.E., and Russell, J. L., eds., Modern depositional environments of sands in south Texas: Gulf Coast Association of Geological Societies, Field Guidebook, p. 43-46.

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., 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.

https://pubs.er.usgs.gov/publication/i1420(NG14)

Bureau of Economic Geology, 1976, Laredo Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.

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.

NGMDB product
Counties Brooks - Jim Wells - Kenedy - Kleberg - Nueces