|Name||Middle and lower Eocene volcanic rocks|
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, Volcaniclastic-volcanic breccia, Pyroclastic-tuff)
Sedimentary > Clastic > Siltstone (Bed, Tuffaceous)Possibly includes some tuffaceous siltstone.
Sedimentary > Clastic > Sandstone (Bed, Tuffaceous)Possibly includes some tuffaceous sandstone.
|Comments||Cresent Formation equivilent to Metchosin (American term versus Canadian term) (Babcock and others, 1994), and almost exclusively referred to as Cresent Formation within Washington (two known exceptions: Henriksen, 1956 ,who maps it as Metchosin in southwestern Washington and Snavely and others, 1958, who maps it, in the Centralia-Chehalis district, as a volcanic sequence of basalt lava flows and breccia of the McIntosh formation). Cresent Formation is at least 5000 ft thick (in Pacific County, Wagner, 1967a, b). Snavely and others, 1958, maps a small chunk of this unit in the Centralia-Chehalis district as a volcanic sequence of basalt lava flows and breccia in the McIntosh formation; I think this outcrop is actually Cresent formation.|
|Stratigraphic units||Cresent Formation; Metchosin (Vancouver Island)|
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.
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.
Snavely, P.D. and Wells, R.E., 1984, Tertiary Volcanic and Intrusive Rocks on the Oregon and Washington Continental Shelf: U. S. Geological Survey Open-File Report 84-282, 17 p.
Luedke, Robert G., 1998, Maps showing distribution, composition, and age of Early and Middle Cenozoic volcanic centers in Oregon and Washington: U.S. Geological Survey Miscellaneous Investigations Series Map I-2291-D, scale 1:1,000,000.
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.
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.
|Counties||Clallam - Cowlitz - Grays Harbor - Jefferson - Kitsap - Lewis - Mason - Pacific - Thurston - Wahkiakum|