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.
State Washington
Name Eocene nonmarine rocks
Geologic age Eocene
Lithologic constituents
Sedimentary > Clastic > Sandstone > Arkose (Bed)
Igneous > Volcanic > Felsic-volcanic > Rhyolite
Igneous > Volcanic > Mafic-volcanic > Basalt
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Coal > Bituminous (Bed)
Metamorphic > Metasedimentary > Metaclastic > Argillite
Sedimentary > Clastic > Conglomerate (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Igneous > Volcanic (Pyroclastic-tuff)
Igneous > Volcanic > Mafic-volcanic > Andesite
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).
Stratigraphic units Manastash Formation; Naches Formation; Roslyn Formation; O'Brien Creek Formation (in part)

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.

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.

NGMDB product
Counties Ferry - King - Kittitas - Lewis - Skamania - Yakima