|Name||Carboniferous-Permian sedimentary and volcanic rocks|
|Geologic age||Devonian to Permian, minor Mesozoic|
Sedimentary > Clastic > Sandstone > Graywacke (Bed)
Sedimentary > Chemical > Chert (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Metamorphic > Metasedimentary > Metaclastic > Argillite
Sedimentary > Clastic > Sandstone > Arkose (Bed)
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Sedimentary > Clastic > Siltstone (Bed, Tuffaceous)Includes some tuffaceous siltstone.
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Igneous > Volcanic > Mafic-volcanic (Flow, Flow-pillows)Basaltic and andesitic and includes some pillow basalt (Misch, 1966).
Metamorphic > Metasedimentary > Metacarbonate > Marble
Metamorphic > Metasedimentary > Metaclastic > Slate
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
|Comments||Dragovich and others, 2002, reports that this unit is mostly metamorphosed sedimentary rocks of the types listed above. Both the Cultus Formation and the Nooksack Formation have "flysch-like aspects", representing marine accumulation, likely in deep water (Misch, 1966).|
|Stratigraphic units||Chilliwack Formation (in part); Cultus Formation (in part); Nooksack Group|
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.
|Counties||Skagit - Snohomish - Whatcom|