|Name||Quaternary-Tertiary bolson deposits|
|Geologic age||Pliocene to Pleistocene|
Unconsolidated > Coarse-detrital > Sand (Bed)
Unconsolidated > Fine-detrital (Bed)
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.|
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.
|Counties||Brewster - Culberson - El Paso - Hudspeth - Jeff Davis - Presidio - Reeves|