| State | Texas |
|---|---|
| Name | Older alluvial deposits |
| Geologic age | Pleistocene |
| Lithologic constituents |
Major
Unconsolidated > Coarse-detrital (Alluvial)
Minor
Unconsolidated > Fine-detrital (Alluvial)
|
| Comments | Alluvium, colluvium, and caliche on surfaces dissected by modern drainage in Trans-Pecos, Presidio, Van Horn, and El Paso areas; pebbles, cobbles, boulders up to 4 ft in size, and sand; unconsolidated to pertly consolidated by calche cement; composed of chert, quartzite, limestone, and volcanic rocks of vesicular, aphanitic, and porphyritic textures. |
| 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 | Andrews - Brewster - Culberson - El Paso - Hudspeth - Jeff Davis - Loving - Pecos - Presidio - Reeves - Terrell - Val Verde - Ward |