Alluvium

Gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.
State Louisiana
Name Alluvium
Geologic age Holocene
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Clay (Alluvial)
Minor
Unconsolidated > Coarse-detrital > Sand (Alluvial)
Unconsolidated > Coarse-detrital > Gravel (Alluvial)
Comments Includes all alluvial valley deposits except natural levees of major streams.
References

Snead, J.I., and Mcculloh, R.P., 1984, Geologic Map of Louisiana: Louisiana Geological Survey, scale 1:500,000.

NGMDB product
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