Browse Items (35 total)

  • Collection: (BB) Boulder Batholith Suite -- Montana

fine grained with pinkish tint

coarse grained, light gray, biotite-hornblende

fine grained, dark gray, porphyritic

porphyritic, light gray, fine grained

coarse grained, light gray biotite-hornblende

coarse grained, light gray

coarse grained, medium gray

medium grained, light gray

medium grained, dark grey, biotite-hornblende granodiorite

fine grained, light gray

intrusive plug of quartz monzonite

flinty, columnar jointing, post-batholith volcanic

from nearly vertical dike cutting quartz monzonite
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