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bolson deposits

bolson deposits
State Texas
Name bolson deposits
Geologic age Phanerozoic | Cenozoic | Tertiary | Pliocene
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.
Primary rock type clay or mud
Secondary rock type silt
Other rock types sandstone; conglomerate
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Clay (Alluvial)
Minor
Unconsolidated > Fine-detrital > Silt (Alluvial)
Unconsolidated > Clastic > Sandstone (Alluvial)
Unconsolidated > Clastic > Conglomerate (Alluvial)
Map references
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
Unit 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.
Counties Brewster