|Name||Glacial drift, undivided|
Unconsolidated > Coarse-detrital > Gravel (Glacial-till, Glacial-outwash)
Unconsolidated > Coarse-detrital > Sand (Glacial)
|Comments||Primarily located in northeast Washington with some deposits along the Skagit River and near Eatonville. The Hayden Creek and Wingate Hill Drifts are alpine glacial deposits. The drift in northeast Washington was deposited by the Cordilleran Ice Sheet in Late and pre-Late Wisconsin (Stoffel and others, 1991). Most deposits are gravel to fine-grained sand. Finer-grained material (silt and clay) is incidental.|
|Stratigraphic units||Nespelem silt (in part); Salmon Springs Stade: Wingate Hills Drift, Hayden Creek Drift; Vashon Drift (in part); Sumas Drift|
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.
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.
|Counties||Chelan - Clallam - Clark - Columbia - Cowlitz - Douglas - Ferry - Garfield - Grant - Grays Harbor - Jefferson - King - Lewis - Lincoln - Okanogan - Pend Oreille - Pierce - San Juan - Skagit - Snohomish - Spokane - Stevens - Whatcom - Whitman|