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Glacial drift, undivided

Glacial and glaciofluvial sand, gravel, and till; includes alpine glacier outwash and till as well as some Recent alluvium.
State Washington
Name Glacial drift, undivided
Geologic age Pleistocene
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.
Primary rock type glacial drift
Secondary rock type till
Other rock types outwash; alluvium
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Sand (Glacial)
Unconsolidated > Coarse-detrital > Gravel (Glacial)
Minor
Unconsolidated > Coarse-detrital > Gravel (Glacial, till)
Incidental
Unconsolidated > Coarse-detrital > Gravel (Glacial, outwash)
Unconsolidated (Alluvial)
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.
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