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Ultramafic and related rocks of ophiolite sequences; Basaltic volcanic and sedimentary rocks

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Basalt flows, flow breccia, agglomerate, pillow basalt and pillow breccia, and lesser shale, chert, siltstone, and mudstone of ophiolitic complexes
State Oregon
Name Ultramafic and related rocks of ophiolite sequences; Basaltic volcanic and sedimentary rocks
Geologic age Jurassic
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
Minor
Sedimentary > Chemical > Chert (Bed)
Sedimentary > Clastic > Mudstone (Bed)
References

Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.

Irwin, W.P., 1994, Geologic map of the Klamath Mountains, California and Oregon: U.S. Geological Survey Miscellaneous Investigations Series Map I-2148, scale 1:500,000.

https://pubs.er.usgs.gov/publication/i2148

Harper, G.D., 1984, The Josephine ophiolite, northwestern California: Geological Society of America Bulletin, v. 95, p. 1009-1026.
NGMDB product
Counties Douglas - Jackson - Josephine