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Ultramafic and related rocks of ophiolite sequences; Basaltic volcanic and sedimentary rocks (Jurassic)

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 (Jurassic)
Geologic age Jurassic
Primary rock type basalt
Secondary rock type mudstone
Other rock types chert
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, pillows)
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
Minor
Sedimentary > Clastic > Mudstone (Bed)
Sedimentary > Chemical > Chert (Bed)
Map references
Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.
Unit 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.
Harper, G.D., 1984, The Josephine ophiolite, northwestern California: Geological Society of America Bulletin, v. 95, p. 1009-1026.
Counties Jackson - Josephine