| 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 |