| State | Texas |
|---|---|
| Name | Bolson deposits |
| Geologic age | Pliocene |
| Lithologic constituents |
Major
Unconsolidated > Fine-detrital > Silt (Alluvial)
Unconsolidated > Fine-detrital > Clay (Alluvial)
Minor
Unconsolidated > Coarse-detrital > Sand (Alluvial)
Unconsolidated > Coarse-detrital > Gravel (Alluvial)
|
| Comments | clay, silt, sandstone, and conglomerate; finer grained material in central part, coarsens toward margins where lenses of pebbles to boulder conglomerate are common, mostly pale red to light brown; thickness in southern area up to 2,000 ft. |
| References | Bureau of Economic Geology, 1979, Marfa Sheet, Geologic Atlas of Texas: Bureau of Economic Geology and The 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 | Brewster |