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Permian rocks

Conglomerate, graywacke, siltstone, argillite and interbedded fossiliferous limestone, greenstone, and minor angular conglomerate in northwestern Stevens and Ferry Counties. Impure quartzite, sandstone, graywacke, greenstone, ribbon chert, chert breccia, and limestone in Snohomish County and on San Juan Island. Lower Permian limestone on Black Mountain in northwestern Whatcom County. Middle Permian rocks in northeastern Washington.
StateWashington
NamePermian rocks
Geologic agePermian-Triassic
Original map labelPm
CommentsStoffel and others, 1991, report that while the term "Mission argillite" was once widely used, it has since been abandoned. Many workers report that these rocks are at least partly metamorphosed.
Primary rock typemetasedimentary rock
Secondary rock typegreenstone
Other rock typesquartzite; siltstone; chert; metavolcanic rock; argillite; limestone; graywacke; conglomerate; slate; lava; tuff; marble; diabase
Lithologic constituents
Major
Metamorphic > MetasedimentaryIncludes metachert, meta-argillite, metaconglomerate, metawacke, and metasiltite.
Minor
Sedimentary > Chemical > Chert (Bed)Possibly only incidental in rank.
Metamorphic > Quartzite
Metamorphic > Greenstone
Incidental
Igneous > Plutonic > Dioritic > DioriteMostly meta-diabase.
Metamorphic > Marble
Igneous > Volcanic (Flow)
Sedimentary > Clastic > Conglomerate (Bed)
Sedimentary > Clastic > Sandstone > Graywacke (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Metamorphic > Argillite
Metamorphic > Metavolcanic
Sedimentary > Clastic > Siltstone (Bed)
Igneous > Volcanic (Pyroclastic, tuff)
Metamorphic > Slate
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.
Weaver, C. E., 1920, The Mineral Resources of Stevens County: Washington Geological Society Bulletin No. 20, 350 p.
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.
Yates, R. G., 1971, Geologic Map of the Northport Quadrangle, Washington: U. S. Geological Survey Miscellaneous Geologic Investigations Map I-603, scale 1:31,680.
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.
Brandon, M. T., Cowan, D. S., Vance, J. A., 1988, The Late Cretaceous San Juan thrust system, San Juan Islands, Washington: Geological Society of America Special Paper 221, 81 p. 1 pl.
Geographic coverageFerry - San Juan - Skagit - Snohomish - Stevens - Whatcom

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