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Unclassified surficial deposits and underlying Alamosa Fm in San Luis Valley

Alamosa Fm: gravel, sand, silt
StateColorado
NameUnclassified surficial deposits and underlying Alamosa Fm in San Luis Valley
Geologic agePhanerozoic | Cenozoic | Tertiary Quaternary
Original map labelQTsa
Primary rock typealluvium
Secondary rock type
Other rock types
Lithologic constituents
Major
Unconsolidated (Alluvial)
Minor
Unconsolidated > Fine-detrital > Silt
Unconsolidated > Coarse-detrital > Sand
Unconsolidated > Coarse-detrital > Gravel
Incidental
Sedimentary > Clastic > Conglomerate
Unconsolidated > Fine-detrital > Clay
Map references
Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Unit references
Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Geographic coverageAlamosa - Conejos - Costilla - Rio Grande - Saguache

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