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Eocene nonmarine rocks

Predominantly sandstone and shale. Includes some conglomerate in the Cle Elum area in Kittilas County. Contains extensive coal seams near Roslyn and carbonaceous shale and coal beds in White Pass area. Contains tuff beds in northwestern Ferry County.
StateWashington
NameEocene nonmarine rocks
Geologic ageEocene
Original map labelEc
CommentsNaches 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 typearkose
Secondary rock typesiltstone
Other rock typesbasalt; 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.
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.
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.
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 coverageFerry - King - Kittitas - Lewis - Skamania - Yakima

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