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Quaternary nonmarine deposits

Periglacial eolian deposits. Buff to light-brown, massive, homogenous, unconsolidated loessial silt; some water-laid material locally. Probably early Pleistocene.
StateWashington
NameQuaternary nonmarine deposits
Geologic agePleistocene
Original map labelQce
Comments"Water-laid material locally" probably refers to glaciolacustrine deposits (eskers, outwash flood) from late Pleistocene-Holocene (Spokane?) glaciation which carved the Channeled Scablands (coulees and dry valleys in Columbia Plateau). Located primarily in Channeled Scablands.
Primary rock typeloess
Secondary rock typeglaciolacustrine
Other rock types
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Silt (Eolian, Loess)
Incidental
Unconsolidated > Coarse-detrital > Sand (Glacial)
Unconsolidated > Coarse-detrital > Boulders (Glacial)
Unconsolidated > Coarse-detrital > Gravel (Glacial)
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.
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., 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.
Geographic coverageAdams - Asotin - Benton - Columbia - Douglas - Franklin - Garfield - Grant - Kittitas - Klickitat - Lincoln - Spokane - Walla Walla - Whitman - Yakima

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