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Gabbro and ultramafic rocks associated with granitic plutons

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Predominantly hornblende gabbro, gabbro, and olivine gabbro, but includes pyroxenite, hornblende pyroxene, and minor peridotite, dunite, and serpentinite (Smith and others, 1982)
State Oregon
Name Gabbro and ultramafic rocks associated with granitic plutons
Geologic age Late Jurassic and Early Cretaceous
Lithologic constituents
Major
Igneous > Plutonic > Gabbroic > Gabbro (Pluton)
Minor
Igneous > Plutonic > Ultramafic > Pyroxenite (Pluton)
Incidental
Metamorphic > Metaigneous > Serpentinite
Igneous > Plutonic > Ultramafic > Peridotite (Pluton)
References

Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.
NGMDB product
Counties Jackson - Josephine