Miocene-Pliocene nonmarine rocks (WAMIPOc;0)

State	Washington
Name	Miocene-Pliocene nonmarine rocks
Geologic age	Miocene-Pliocene
Original map label	MPLc
Comments	Ellensburg formation also described as fluvial and laharic gravel, sand, silt, and clay. Thorp gravel is coarse sand and gravel conformably and unconformably overlying the Ellensburg formation (Bentley and Campbell, 1983). Mackin, 1961, considers the Saddle Mountain Basalt Member to be part of the Ellensburg Formation; local basalt flows are probably of this type (or of the Beverly Member) though most of the Saddle Mountain Basalt Member is part of unit WAMPLv.
Primary rock type	conglomerate
Secondary rock type	pumice
Other rock types	gravel; sand; basalt; lahar
Lithologic constituents	Major Igneous > Volcanic (Pyroclastic, air fall)Pumicite of Beverly Member; may also be described as pumiceous sandstone or siltstone. Sedimentary > Clastic > Conglomerate (Bed) Minor Unconsolidated (Mass wasting)Laharic deposits. Unconsolidated > Coarse-detrital > Sand (Fluvial)Mostly basaltic. Possibly consolidated to sandstone in some areas. Unconsolidated > Coarse-detrital > Gravel (Fluvial)Mostly basaltic. Incidental Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
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. 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. Walsh, T. J., Korosec, M. A., Phillips, W. M., Logan, R. T., Schasse, H. W., 1987, Geologic Map of Washington-Southwest Quadrant: Washington Division of Geology and Earth Resources, Geologic Map GM-34, scale 1:250,000. Warren, W. C., 1941, Relation of the Yakima Basalt to the Keechelus Andesite Series: The Journal of Geology, v. 49, p. 795-814. Tabor, R. W., Waitt, R. B., Jr., Frizzell, V. A., Jr., Swanson, D. A., Byerly, G. R., Bentley, R. D., 1982, Geologic Map of the Wanatchee 1:100,000 Quadrangle, Central Washington: U. S. Geological Survey Miscellaneous Investigations Series Map I-1311, scale 1:100,000. [http://pubs.er.usgs.gov/publication/i1311] Bentley, R. D. and Campbell, N. P., 1983, Geologic Map of the Yakima Quadrangle, Washington: Washington Division of Geology and Earth Resources Geologic Map GM-29, scale 1:62,500. Smith, G. A., Shafiquillah, M., Campbell, N. P., Deacon, M. W., 1989, Geochronology of the Ellensburg Formation--Constraints on Neogene Volcanism and Stratigraphic Relationships in Central Washington: Isochron/West, v. 53, p. 28-32. Mackin, J. H., 1961, A Stratigraphic Section in the Yakima Basalt and the Ellensburg Formation in South-Central Washington: Washington Division of Mines and Geology Report of Investigations no.19, 45 p. Grolier, M. J. and Bingham, J. W., 1971, Geologic Map and Sections of Parts of Grant, Adams, and Franklin Counties, Washington: U. S. Geological Survey Miscellaneous Geologic Investigations Map I-589, 6 pls., scale 1:62,500. [http://pubs.er.usgs.gov/publication/i589]
Geographic coverage	Adams - Benton - Douglas - Grant - Kittitas - Klickitat - Yakima