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Alluvium

Mostly unconsolidated silt, sand, and gravel valley fill with some clay; includes low-level terrace, marsh, peat, artificial fill, and glacial deposits locally.
StateWashington
NameAlluvium
Geologic ageHolocene
Original map labelQa
Primary rock typealluvium
Secondary rock typealluvial terrace
Other rock typespeat; glacial drift
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Sand (Alluvial)
Unconsolidated > Fine-detrital > Silt (Alluvial)
Minor
Unconsolidated > Coarse-detrital > Gravel (Alluvial)
Incidental
Unconsolidated > Coarse-detrital > Gravel (Glacial)
Unconsolidated > Fine-detrital > Clay (Alluvial)
Unconsolidated > Peat (Bed)
Map references
Huntting, M. T., Bennett, W. A. G., Livingston, V. E. Jr., Moen, W. S., 1961, Geologic Map of Washington: Washington Division of Mines and Geology, scale 1:500,000.
Unit references
Huntting, M. T., Bennett, W. A. G., Livingston, V. E. Jr., Moen, W. S., 1961, Geologic Map of Washington: Washington Division of Mines and Geology, scale 1:500,000.
Geographic coverageAdams - Asotin - Benton - Chelan - Clallam - Clark - Columbia - Cowlitz - Douglas - Ferry - Franklin - Garfield - Grant - Grays Harbor - Jefferson - King - Kittitas - Klickitat - Lewis - Mason - Okanogan - Pacific - Pend Oreille - Pierce - Skagit - Skamania - Snohomish - Spokane - Stevens - Thurston - Wahkiakum - Walla Walla - Whatcom - Whitman - Yakima

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