Oligocene-Miocene marine rocks (WAOGMI;0)

State	Washington
Name	Oligocene-Miocene marine rocks
Geologic age	Oligocene
Original map label	OLM
Primary rock type	sandstone
Secondary rock type	siltstone
Other rock types	shale; olistostrome; tuff; conglomerate
Lithologic constituents	Minor Sedimentary > Clastic > Siltstone (Tuffaceous) Sedimentary > Clastic > Sandstone (Bed)Includes arkosic to lithofeldspathic sandstone (Snavely and others, 1993). Sedimentary > Clastic > Sandstone (Tuffaceous) Incidental Sedimentary > Clastic (Olistrostrome) Sedimentary > Clastic > Mudstone > Shale (Bed) Sedimentary > Clastic > Conglomerate (Bed) Igneous > Volcanic (Pyroclastic, tuff) Sedimentary > Clastic > Siltstone (Bed)
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. 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. Rau, W. W., 1967, Geology of the Wynoochee Valley Quadrangle, Grays Harbor County, Washington: Washington Division of Mines and Geology Bulletin no. 56, 51 p. Babcock, R. S., Suczek, C. A., Engebretson, D. C., 1994, The Cresent "Terrane", Olympic Peninsula and Southern Vancouver Island, in Lasmanis, R. and Cheney, E. S., convenors, Regional Geology of Washington State: Washington Division of Geology and Earth Resources Bulletin 80, p. 141-157. Snavely, P. D., MacLeod, N. S., Niem, A. R., 1993, Geologic map of the Cape Flattery, Challam Bay, Ozette Lake, and Lake Pleasant Quadrangles, Northwestern Olympic Peninsula, Washington: U. S. Geological Survey Map I-1946, scale 1:48,000. [http://pubs.er.usgs.gov/publication/i1946] Wagner, H. C., 1967a, Preliminary geologic map of the South Bend quadrangle, Pacific County, Washington: U. S. Geological Survey Open File Reports 67-266, scale 1:62,500. [http://pubs.er.usgs.gov/publication/ofr67266] Wagner, H. C., 1967b, Preliminary geologic map of the Haymond quadrangle, Pacific County, Washington, U. S. Geological Survey Open File Reports 67-265, scale 1:62,500. [http://pubs.er.usgs.gov/publication/ofr67265] Walsh, T. J., 1987, Geologic Map of the Astoria and Ilwaco Quadrangles, Washington and Oregon: Washington Division of Geology and Earth Resources Open File Report 87-2, scale 1:100,000. Tabor, R. W. and Cady, W. M., 1978, Geologic Map of the Olympic Peninsula, Washington: U. S. Geological Survey Miscellaneous Investigations Series Map I-994, scale 1:125,000. [http://pubs.er.usgs.gov/publication/i994]
Geographic coverage	Clallam - Grays Harbor - Jefferson - King - Kitsap - Mason - Pacific - Wahkiakum