Quaternary-Tertiary bolson deposits

Quaternary-Tertiary bolson deposits
State Texas
Name Quaternary-Tertiary bolson deposits
Geologic age Pliocene to Pleistocene
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Sand (Bed)
Unconsolidated > Fine-detrital (Bed)
Incidental
Sedimentary > Clastic > Conglomerate (Bed)
Comments clay, silt, sandstone, and conglomerate; mostly clay, silt, and gypsiferous fine-grained sandst. in central part of Presidio bolson, coarsens toward margins where lenses of pebble to boulder conglomerate are common, mostly pale red to lt. brown; thickness up to 2,000 ft.
References

Bureau of Economic Geology, 1979, Emory Peak--Presidio Sheet, Geologic Atlas of Texas, University of Texas at Austin.

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 Brewster - Culberson - El Paso - Hudspeth - Jeff Davis - Presidio - Reeves