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Ultramafic and related rocks of ophiolite sequences (ORJu;0)
Geologic Formation
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Lithology
Serpentinite
Peridotite
Diorite
Other
(593 mi²)
Geologic Age
Paleozoic – Jurassic (542 Ma – 145 Ma ago)
Geologic Unit Label
Ju
Predominantly harzburgite and dunite with both cumulate and tectonite fabrics. Locally altered to serpentinite. Includes gabbroic rocks and sheeted diabasic dike complexes. Comprises Josephine ophiolite of Harper (1980), ophiolites of Onion Mountain, Sexton Mountain, Pearsoll Peak, Rogue River, and Riddle areas (Smith and others, 1982) and Coast Range ophiolite and serpentinite melange of M.C. Blake, Jr. and A.S. Jayko (unpublished data, 1985). In southwest Oregon, locally includes small bodies of early Mesozoic or late Paleozoic serpentinized and sheared ultramafic rocks, mostly in shear zones. Locally, volcanic and sedimentary rocks shown separately
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Geologic Formation
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