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Oligocene volcanic rocks in Colorado
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Subcategories
This category has the following 5 subcategories, out of 5 total.
O
Oligocene andesite formations in Colorado
(1 F)
Oligocene basalt in Colorado
(1 C)
Oligocene lava flows in Colorado
(1 F)
Oligocene rhyolite formations in Colorado
(1 F)
Oligocene trachyandesite in Colorado
(1 F)