| State | Washington |
|---|---|
| Name | Younger glacial drift |
| Geologic age | Pleistocene |
| Lithologic constituents | Major
Unconsolidated > Coarse-detrital (Glacial-till)gravel and sand
Unconsolidated > Fine-detrital (Glacial-till)silt and clay
|
| Comments | Possibly some outwash from the Fraser Glaciation (which encompassed the Vashon and Sumas Stades) occurs in this unit; most of it, however, is mapped within WAQg1o. |
| Stratigraphic units | Vashon drift (moraine and till members); 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.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. |
| NGMDB product | |
| Counties | King - Kitsap - Lewis - Mason - Pierce - Skagit - Snohomish - Stevens - Thurston - Whatcom |