Younger glacial drift

Advance and recessional outwash, stratified drift, and associated deposits. Primarily silt, sand, and gravel with some clay. Includes alluvium locally and scabland deposits of eastern Washington.
State Washington
Name Younger glacial drift
Geologic age Pleistocene
Lithologic constituents
Major
Unconsolidated > Fine-detrital (Glacial-outwash, Alluvial)
Unconsolidated > Coarse-detrital (Glacial-outwash, Glacial-esker, Alluvial)
Comments Principally Wisconsin in age. Includes outburst flood deposits from glacial Lake Missoula in the Channeled Scablands.
Stratigraphic units Vashon Drift: outwash member, Steilacoom gravels; Washtucna gravel; Sumas Drift (in part)
References

Huntting, M.T., Bennett, W.A.G., Livingston, V.E.Jr., and Moen, W.S., 1961, Geologic Map of Washington: Washington Division of Mines and Geology, scale 1:500,000.

Easterbrook, D.J., 1976a, Quaternary Geology of the Pacific Northwest, in Mahaney, W.C., ed., Quaternary Stratigraphy of North America: Stroudsberg, PA, Dowden, Hutchinson and Ross, p. 441-462.

Schuster, J.E., 1994, Geologic Map of the Walla Walla 1:100,000 quadrangle, Washington: Washingtone State Division of Geology and Earth Resources Open-File Report 94-3, 18 p.

Schuster, J.E., Gulick, C.W., Reidel, S.P., Fecht, K.R., Zurenko, S., 1997, Geologic Map of Washington--Southeast Quadrant: Washington Division of Geology and Earth Resources Geologic Map GM-45, scale 1:250,000.

Bretz, J.H., 1923, The Channeled Scablands of the Columbia Plateau: The Journal of Geology, v. 31, no. 8, p. 617-649.

Stoffel, K.L., Joseph, N.L., Waggoner, S.Z., Gulick, C.W., Korosec, M.A., Bunning, B.B., 1991, Geologic Map of Washington--Northeast Quadrant: Washington Division of Geology and Earth Resources Geologic Map, GM-39, scale 1:250,000.

Jones, M.A., 1999, Geologic Framework for the Puget Sound Aquifer System, Washington and British Columbia: U. S. Geological Survey Professional Paper 1424-C, 31 p., 18 pls.

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Counties Adams - Benton - Columbia - Douglas - Franklin - Grant - King - Kitsap - Kittitas - Lewis - Lincoln - Mason - Pierce - Skagit - Snohomish - Spokane - Thurston - Walla Walla - Whatcom - Whitman