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Alluvium and Colluvium

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Clay, silt, sand, and gravel in flood plains, fans, terraces, and slopes.
State Wyoming
Name Alluvium and Colluvium
Geologic age Pleistocene-Holocene
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Clay (Alluvial, Colluvial)
Unconsolidated > Fine-detrital > Silt (Alluvial, Colluvial)
Unconsolidated > Coarse-detrital > Sand (Alluvial, Colluvial)
Minor
Unconsolidated > Coarse-detrital > Gravel (Alluvial, Colluvial)
References

Love, J.D. and Christiansen, A.C., 1985, Geologic Map of Wyoming: U.S. Geological Survey, scale 1:500,000.

https://pubs.er.usgs.gov/publication/70046739
NGMDB product
Counties Albany - Big Horn - Campbell - Carbon - Converse - Crook - Fremont - Goshen - Hot Springs - Johnson - Laramie - Lincoln - Natrona - Niobrara - Park - Platte - Sheridan - Sublette - Sweetwater - Teton - Uinta - Washakie - Weston