Granitic rocks (Cretaceous and Jurassic) (ORKJg;0)

Mostly tonalite and quartz diorite but including lesser amounts of other granitoid rocks. Potassium-argon ages determined on hornblende indicates plutons range in age from 143 to 166 Ma (Hotz, 1971)

State	Oregon
Name	Granitic rocks (Cretaceous and Jurassic)
Geologic age	Late Jurassic and Early Cretaceous
Original map label	KJg
Primary rock type	quartz diorite
Secondary rock type	diorite
Other rock types	tonalite; gabbro
Lithologic constituents	Major Igneous > Plutonic > Dioritic > Diorite (Pluton) Igneous > Plutonic > Dioritic > Quartz-diorite (Pluton) Minor Igneous > Plutonic > Granitic > Tonalite (Pluton) Incidental Igneous > Plutonic > Gabbroic > Gabbro (Pluton)
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. [http://pubs.er.usgs.gov/publication/i2148]
Geographic coverage	Douglas - Grant - Jackson - Josephine - Lane