Quaternary nonmarine deposits

Periglacial eolian deposits. Buff to light-brown, massive, homogenous, unconsolidated loessial silt; some water-laid material locally. Probably early Pleistocene.
State Washington
Name Quaternary nonmarine deposits
Geologic age Pleistocene
Lithologic constituents
Unconsolidated > Fine-detrital > Silt (Eolian-loess)
Unconsolidated > Coarse-detrital > Gravel (Glacial)
Unconsolidated > Coarse-detrital > Boulders (Glacial)
Unconsolidated > Coarse-detrital > Sand (Glacial)
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.
Stratigraphic units Palouse Formation

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., 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.

NGMDB product
Counties Adams - Asotin - Benton - Columbia - Douglas - Franklin - Garfield - Grant - Kittitas - Klickitat - Lincoln - Spokane - Walla Walla - Whitman - Yakima