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Collection: (BB) Boulder Batholith Suite -- Montana
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Obsidian vitrophyre
ignimbrite layer in a welded tuff
Rhyolite
flinty, columnar jointing, post-batholith volcanic
Granogabbro
from large sill
Quartz monzonite
fine grained with pinkish tint
Rhyolite dike
from nearly vertical dike cutting quartz monzonite
Andesite
pre-batholith volcanic
Quartz monzonite
Rhyolite
intrusive plug of quartz monzonite
Basalt
Amygdaloidal basalt
Quartz monzonite
Quartz monzonite
Quartz monzonite
Quartz monzonite
BB Suite PDF
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