Pre-Upper Jurassic metamorphic rocks of the low-grade zone

Greenschist of central Whatcom and Skagit Counties.
State Washington
Name Pre-Upper Jurassic metamorphic rocks of the low-grade zone
Geologic age Early Cretaceous metamorphism (Jurassic protolith)
Lithologic constituents
Major
Metamorphic > Schist (Greenschist, Glaucophane-schist)
Stratigraphic units Shuksan Greenschist (part of the Easton Metamorphic Suite)
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., 1979, Geologic Map of the Marblemount Quadrangle, Washington: Washington Division of Geology and Earth Resources Geologic Map GM-23, scale 1:48,000.

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.

Brown, E.H., Comparison of the Mineralogy and Phase Relations of Blueschists from the North Cascades, Washington, and Greenschists from Otago, New Zealand: Geological Society of America Bulletin, v. 85, no. 3, p. 333-344.

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.

Duggan, K.M. and Brown, E.H., 1994, Correlation of the Tonga Formation and Chiwaukum Schist, North Cascades, Washington: Implications for Late Cretaceous orogenic mechanisms: Tectonics, v. 13, no. 6, p. 1411-1424.

NGMDB product
Counties Skagit - Whatcom