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Collection: (BB) Boulder Batholith Suite -- Montana
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Quartz latite
intrusive
Porphyritic andesite
massive, tabular, sharp-edged blocks
Obsidian vitrophyre
ignimbrite layer in a welded tuff
Granogabbro
from large sill
Granodiorite
Granodiorite
basic
Granodiorite
medium grained, medium gray w/ pinkish tint
Dike
BB Suite PDF
Basalt
Aplite
iron-stained
Andesite volcanics
possibly crystal tuff
Andesite
pre-batholith volcanic
Amygdaloidal basalt
Alaskite
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