Greg Harper in the field in the Cascades; outcrop in the Ingalls Ophiolite.
Image copyright  © 2003 G.D. Harper.

For details see: Metzger, E., Harper, G.D., and Miller, R.B., 2002. Geochemistry and tectonic setting of the ophiolitic Ingalls Complex, North Cascades, Washington: Implications for correlations of Jurassic Cordilleran ophiolites.  J. Geol., 110, 543-560.

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