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Pre-Middle Jurassic sedimentary and volcanic rocks

Sedimentary and volcanic rocks, undivided. Graywacke, argillite, slate, greenstone, and spilitic volcanic rocks.
StateWashington
NamePre-Middle Jurassic sedimentary and volcanic rocks
Geologic ageLate Paleozoic deposition? with Cretaceous metamorphism?
Original map labelpJ
CommentsOriginal sedimentary and volcanic rocks are largely deformed and metamorphosed Tertiary plutonism destroyed greenschist facies minerals and now many rocks are pyroxene hornfels (Tabor and others, 1993).
Primary rock typechert
Secondary rock typemetavolcanic rock
Other rock typesargillite; graywacke; metasedimentary rock; quartzite; conglomerate
Lithologic constituents
Major
Metamorphic > Metavolcanic (Greenschist)Includes spilite, greenstone, meta-andesite and meta-basalt.
Sedimentary > Chemical > Chert (Bed)
Minor
Sedimentary > Clastic > Sandstone > Graywacke (Bed)
Metamorphic > MetasedimentaryIncludes metagraywacke, "metagrit", meta-conglomerate, and slate.
Metamorphic > ArgilliteCalcareous; grades into phyllitic slate in north King County; black in Skagit County.
Incidental
Sedimentary > Clastic > Conglomerate (Bed)
Metamorphic > QuartziteMeta-chert.
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.
Tabor, R. W., Frizzell, V. A., Jr., Booth, D. B., Waitt, R. B., Whetten, J. T., Zartman, R. E., 1993, Geologic Map of the Skykomish River 30- by 60-Minute Quadrangle, Washington: U. S. Geological Survey Miscellaneous Investigations Series Map I-1963, 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.
Tabor, R. W., Booth, D. B., Vance, J. A., Ford, A. B., Ort, M. H., 1988, Preliminary geologic map of the Sauk River 30 by 60 minute quadrangle, Washington: U. S. Geological Survey Open File Report 88-692, 51 p., 1 pl.
Geographic coverageKing - Skagit - Snohomish

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