Landslide and mudflow deposits

Predominantly landslide debris. Includes till-like mudflow deposits of andesitic rock fragments in clayey sand matrix in Buckley-Enumclaw area of Kind and Pierce Counties.
State Washington
Name Landslide and mudflow deposits
Geologic age Holocene
Lithologic constituents
Unconsolidated > Fine-detrital > Silt (Landslide)
Unconsolidated > Coarse-detrital > Sand (Landslide)
Unconsolidated > Fine-detrital > Clay (Landslide)Osceola mudflow is mostly clay
Unconsolidated > Coarse-detrital > Gravel (Landslide)
Comments Andesitic mudflows are lahar-type deposits associated with Mt. Rainier.
Stratigraphic units Osceola mudflow

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.

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.

Luedke, R.G., Smith, R.L., Russell-Robinson, S.L., 1983, Map showing distribution, composition, and age of late Cenozoic volcanoes and volcanic rocks of the Cascade Range and vicinity, northwestern United States: U. S. Geological Survey Miscellaneous Investigations Series Map I-1507, scale 1:500,000.

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.

NGMDB product
Counties Benton - Clark - Cowlitz - Franklin - King - Lewis - Pierce - Skamania - Thurston - Whatcom - Yakima