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bolson deposits

bolson deposits
StateTexas
Namebolson deposits
Geologic agePhanerozoic | Cenozoic | Tertiary | Pliocene
Original map labelPobo
Commentsclay, 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 typeclay or mud
Secondary rock typesilt
Other rock typessandstone; conglomerate
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Clay (Alluvial)
Minor
Unconsolidated > Clastic > Conglomerate (Alluvial)
Unconsolidated > Clastic > Sandstone (Alluvial)
Unconsolidated > Fine-detrital > Silt (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.
Geographic coverageBrewster

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=TXPObo;0
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