Upper Eocene volcanic rocks (WAEOv1r;0)

State	Washington
Name	Upper Eocene volcanic rocks
Geologic age	Late-Middle Eocene
Original map label	Ev1r
Comments	Two stratigraphic units in WAEv1r, "Kachess rhyolite" and "Rhyolite in the Guye", were listed in Huntting and others, 1961, with a footnote referencing a 1906 USGS geologic atlas folio by G. O. Smith and F. C. Calkins; none of the referenced literature in this database names any outcrops similarly. Furthermore, any rhyolite within the Guye Formation is geographically more likely to occur in either WAEPKc (which includes the Guye Formation) or WAlTv (which includes the Mt. Catherine rhyolite adjacent to the Guye Formation). The Kachess rhyolite must be associated with Kachess Lake just north of the unit.
Primary rock type	rhyolite
Secondary rock type	basalt
Other rock types	andesite; sandstone; siltstone; argillite; shale; coal
Lithologic constituents	Major Igneous > Volcanic > Felsic-volcanic > Rhyolite (Flow) Minor Igneous > Volcanic > Mafic-volcanic > Basalt (Flow) Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic, tuff) Incidental Sedimentary > Clastic > Mudstone > Shale (Bed) Sedimentary > Clastic > Siltstone (Bed) Sedimentary > Clastic > Sandstone (Bed) Igneous > Volcanic > Mafic-volcanic > Andesite (Volcaniclastic, volcanic breccia) Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)Possibly minor in rank but subordinate to rhyolite and basalt. Igneous > Volcanic > Mafic-volcanic > Basalt (Volcaniclastic, volcanic breccia)Possibly minor in rank. Igneous > Volcanic > Felsic-volcanic > Rhyolite (Dome)Possibly minor in rank. Sedimentary > Coal (Bed)Rare occurrence in Naches Formation; may or may not occur in this unit. 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. 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. 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. Tabor, R. W., Frizzell, V. A., Jr., Booth, D. B., Waitt, R. B., 2000, Geologic Map of the Snoqualmie Pass 30 x 60 Minute Quadrangle, Washington: U. S. Geological Survey Geologic Investigations Series I-2538, 57 p., 1 pl. [http://pubs.er.usgs.gov/publication/i2538]
Geographic coverage	Kittitas