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Carboniferous-Permian sedimentary and volcanic rocks

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Sedimentary and volcanic rocks, undivided. Cherty and slaty argillite, siltstone, graywacke, chert, greenstone, tuff, andesite, and spilitic volcanics.
State Washington
Name Carboniferous-Permian sedimentary and volcanic rocks
Geologic age Devonian to Permian; some Jurassic
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone > Graywacke (Bed)
Minor
Sedimentary > Chemical > Chert (Bed)
Metamorphic > Metaigneous > Greenstone
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Metamorphic > Metasedimentary > Metaclastic > Argillite
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Incidental
Sedimentary > Clastic > Sandstone > Arkose (Bed)
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)
Sedimentary > Carbonate > Limestone (Bed)
Metamorphic > Metasedimentary > Metaclastic > Slate
Sedimentary > Clastic > Conglomerate (Bed)
Metamorphic > Metasedimentary > Metaclastic > PhyllitePossibly minor in rank.
Metamorphic > Metasedimentary > Metacarbonate > Marble
Comments Dragovich and others, 2002, reports that this unit is mostly metamorphosed sedimentary rocks of the types listed above.
Stratigraphic units Chilliwack Formation (in part); Cultus Formation (in part); Hozomeen Group (in part); Bell Pass melange (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.

Misch, P., 1977, Bedrock Geology of the North Cascades, in Brown, E. H. and Ellis, R. C. (eds.), Geological Excursions in the Pacific Northwest, Geological Society of America 1977 Annual Meeting, Seattle: Western Washington University, p. 1-62.

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., Haugerud, R.A., Booth, D.B., Brown, E.H., 1994, Preliminary Geologic Map of the Mount Baker 30- by 60-Minute Quadrangle, Washington: U. S. Geological Survey Open File Report 94-403, 55p., 2 pls.

Misch, P., 1966, Tectonic evolution of the northern Cascades of Washington--A west-cordilleran case history. In Canadian Institute of Mining and Metallurgy; and others, A symposium on the tectonic history and mineral deposits of the western Cordillera in British Columbia and neighboring parts of the United States, Vancouver, 1964: Canadian Institute of Mining and Metallurgy Special Volume 8, p. 101-148, 1 pl.
NGMDB product
Counties Columbia - Skagit - Whatcom