Oligocene-Miocene volcanic rocks (WAOGMIv;0)

State	Washington
Name	Oligocene-Miocene volcanic rocks
Geologic age	Miocene
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanic > Andesite (Flow, Pyroclastic-tuff, Volcaniclastic-volcanic breccia) Minor Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, Pyroclastic-tuff, Volcaniclastic-volcanic breccia) Incidental Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic-tuff) Sedimentary > Clastic > Conglomerate (Bed, Tuffaceous)Volcaniclastic. Sedimentary > Clastic > Sandstone (Bed) Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic-tuff)
Comments	Some recent maps show that some of this unit is mostly dacite (Luedke, 1998, Stoffel and others, 1991). Others maintain that it is mostly andesite (Walsh and others, 1987). Fifes Peak andesite and upper part of Keechelus andesite in the Mt. Aix Quadrangle are the same unit (Warren, 1941).
Stratigraphic units	Fifes Peak andesite (upper part of Keechelus andesite, some of lower part); Taneum andesite; Klondike Mtn Formation
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. 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. https://pubs.er.usgs.gov/publication/i2291D Warren, W.C., 1941, Relation of the Yakima Basalt to the Keechelus Andesite Series: The Journal of Geology, v. 49, p. 795-814. Parker, R.L. and Calkins, J.A., 1964, Geology of the Curlew Quadrangle Ferry County Washington, U.S. Geological Survey Bulletin 1169, 95 p. https://pubs.er.usgs.gov/publication/b1169 Stoffel, K.L., Joseph, N.L., Waggoner, S.Z., Gulick, C.W., Korosec, M.A., Bunning, B.B., 1991, Geologic Map of Washington--Northeast Quadrant: Washington Division of Geology and Earth Resources Geologic Map, GM-39, scale 1:250,000. 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. Dragovich, J.D., Logan, R.L., Schasse, H.W., Walsh, T.J., Lingley, W.S., Jr., Norman, D.K., Gerstel, W.J., Lapen, T.J., Schuster, J.E., Meyers, K.D., 2002, Geologic Map of Washington-Northwest Quadrant: Washington Division of Geology and Earth Resources Geologic Map GM-50, scale 1:250,000.
NGMDB product	NGMDB product page for 30777
Counties	Clark - Ferry - King - Kittitas - Lewis - Pierce - Skamania - Yakima

State

Washington

Name

Oligocene-Miocene volcanic rocks

Geologic age

Miocene

Lithologic constituents

Major

Igneous > Volcanic > Mafic-volcanic > Andesite (Flow, Pyroclastic-tuff, Volcaniclastic-volcanic breccia)

Minor

Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, Pyroclastic-tuff, Volcaniclastic-volcanic breccia)

Incidental

Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic-tuff)

Sedimentary > Clastic > Conglomerate (Bed, Tuffaceous)Volcaniclastic.

Sedimentary > Clastic > Sandstone (Bed)

Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic-tuff)

Comments

Some recent maps show that some of this unit is mostly dacite (Luedke, 1998, Stoffel and others, 1991). Others maintain that it is mostly andesite (Walsh and others, 1987). Fifes Peak andesite and upper part of Keechelus andesite in the Mt. Aix Quadrangle are the same unit (Warren, 1941).

Stratigraphic units

Fifes Peak andesite (upper part of Keechelus andesite, some of lower part); Taneum andesite; Klondike Mtn Formation

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.

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.

https://pubs.er.usgs.gov/publication/i2291D

Warren, W.C., 1941, Relation of the Yakima Basalt to the Keechelus Andesite Series: The Journal of Geology, v. 49, p. 795-814.

Parker, R.L. and Calkins, J.A., 1964, Geology of the Curlew Quadrangle Ferry County Washington, U.S. Geological Survey Bulletin 1169, 95 p.

https://pubs.er.usgs.gov/publication/b1169

Stoffel, K.L., Joseph, N.L., Waggoner, S.Z., Gulick, C.W., Korosec, M.A., Bunning, B.B., 1991, Geologic Map of Washington--Northeast Quadrant: Washington Division of Geology and Earth Resources Geologic Map, GM-39, scale 1:250,000.

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.

Dragovich, J.D., Logan, R.L., Schasse, H.W., Walsh, T.J., Lingley, W.S., Jr., Norman, D.K., Gerstel, W.J., Lapen, T.J., Schuster, J.E., Meyers, K.D., 2002, Geologic Map of Washington-Northwest Quadrant: Washington Division of Geology and Earth Resources Geologic Map GM-50, scale 1:250,000.

NGMDB product

NGMDB product page for 30777

Counties

Clark - Ferry - King - Kittitas - Lewis - Pierce - Skamania - Yakima