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A massive, frequently discordant, intrusion of coarsely textured plutonic rocks, at least 100 km2 in area and extending 20–30 km down into the layer of magma, which may be composed of several plutons.
http://geology.isu.edu/Digital_Geology_Idaho/ The Idaho Batholith.
From: batholith in A Dictionary of Geography »
Subjects: Environmental Science — Earth Sciences and Geography.
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