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Lower upper Eocene marine and nonmarine rocks

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Predominantly massive to well-bedded tuffaceous marine siltstone with interbedded arkosic and basaltic sandstone. Includes conglomerate in King County and along north side of Olympic Peninsula. Minor lava flows and breccia in western Lewis County and eastern Grays Harbor County. Coal seams in central Lewis County and north-central Pierce County.
State Washington
Name Lower upper Eocene marine and nonmarine rocks
Geologic age Eocene
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed, Arkosic)Mostly arkosic to feldspathic sandstone but also includes significant amounts of basaltic sandstone, arenite, and graywacke.
Sedimentary > Clastic > Siltstone (Tuffaceous)
Incidental
Sedimentary > Clastic > Mudstone > Claystone (Bed)
Sedimentary > Coal (Bed)
Sedimentary > Clastic > Mixed-clastic (Olistrostrome)Cape Flattery breccia.
Sedimentary > Clastic > Mudstone > Shale (Bed)
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, Pyroclastic-tuff, Volcaniclastic-volcanic breccia)
Sedimentary > Clastic > Conglomerate (Bed)
Comments WAE2 is sometimes undifferentiated from WAE1 in the literature. McIntosh Formation is 500-3500 ft thick (Wagner, 1967a, b).
Stratigraphic units Cowlitz formation (in part: Stillwater member); Lyre Formation (including Cape Flattery breccia); McIntosh Formation (in part)
References

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.

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.

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.

Wells, R.E., 1989, Geologic Map of the Cape Disappointment-Naselle River Area, Pacific and Wahkiakum Counties, Washington: U. S. Geological Survey Miscellaneous Investigations Series Map I-1832, scale 1:62,500.

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.

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.

Henriksen, D.A., 1956, Eocene Stratigraphy of the Lower Cowlitz River-Eastern Willapa Hills Area, Southwestern Washington: Washington Division of Mines and Geology Bulletin No. 43, 122 p, 1 pls.

Snavely, P.D.,Jr., Brown, R.D., Roberts, A.E., Rau, W.W., 1958, Geology and Coal Resources of the Centralia-Chelalis District, Washington: U. S. Geological Survey Bulletin 1053, 149 p.

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.
NGMDB product
Counties Clallam - Cowlitz - Grays Harbor - King - Lewis - Pacific - Pierce - Thurston - Wahkiakum