Eocene nonmarine rocks (WAEOc;0)

State	Washington
Name	Eocene nonmarine rocks
Geologic age	Eocene
Original map label	Ec
Comments	Naches Formation is mostly basaltic and rhyolitic volcanic rock with minor andesitic rock and interbedded sedimentary rock (feldspathic sandstone) (Tabor and others, 1993, Stout, 1964). The thickness of the Naches Formation is 8000-10000+ feet thick (Stout, 1964).
Primary rock type	arkose
Secondary rock type	siltstone
Other rock types	basalt; rhyolite; andesite; argillite; tuff; shale; conglomerate; coal
Lithologic constituents	Major Sedimentary > Clastic > Sandstone > Arkose (Bed) Minor Igneous > Volcanic > Felsic-volcanic > Rhyolite Igneous > Volcanic > Mafic-volcanic > Basalt Sedimentary > Clastic > Siltstone (Bed) Incidental Igneous > Volcanic (Pyroclastic, tuff) Igneous > Volcanic > Mafic-volcanic > Andesite Sedimentary > Coal > Bituminous (Bed) Sedimentary > Clastic > Conglomerate (Bed) Sedimentary > Clastic > Mudstone > Shale (Bed) Metamorphic > Argillite
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. Muessig, S., 1967, Geology of the Republic Quadrangle and a Part of the Aeneas Quadrangle, Ferry County, Washington: U. S. Geological Survey Bulletin 1216, 135 p. [http://pubs.er.usgs.gov/publication/b1216] Foster, R. J., 1960, Tertiary Geology of a Portion of the Central Cascade Mountains, Washington: Geological Society of America Bulletin v. 71, no. 2, p. 99-126. Tabor, R. W., Frizzell, V. A., Jr., Booth, D. B., Waitt, R. B., Whetten, J. T., Zartman, R. E., 1993, Geologic Map of the Skykomish River 30- by 60-Minute Quadrangle, Washington: U. S. Geological Survey Miscellaneous Investigations Series Map I-1963, scale 1:100,000. [http://pubs.er.usgs.gov/publication/i1963] 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] Stout, M. L., 1964, Geology of a Part of the South-Central Cascade Mountains, Washington: Geological Society of America Bulletin, v. 75, no. 4, p 317-334.
Geographic coverage	Ferry - King - Kittitas - Lewis - Skamania - Yakima