Browse Items (35 total)

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

basic

massive, tabular, sharp-edged blocks

possibly crystal tuff

fine grained, light gray

medium grained, dark grey, biotite-hornblende granodiorite

medium grained, light gray

coarse grained, medium gray

medium grained, medium gray w/ pinkish tint

coarse grained, light gray

coarse grained, light gray biotite-hornblende

intrusive

porphyritic, light gray, fine grained

fine grained, dark gray, porphyritic

iron-stained

coarse grained, light gray, biotite-hornblende
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