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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
StateOregon
NameUltramafic and related rocks of ophiolite sequences; Basaltic volcanic and sedimentary rocks (Jurassic)
Geologic ageJurassic
Original map labelJub
Primary rock typebasalt
Secondary rock typemudstone
Other rock typeschert
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, pillows)
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.
Geographic coverageDouglas - Jackson - Josephine

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