Aplite dike in Butte Quartz Monzonite (Late Cretaceous, 76 Ma; roadcut next to Syndicate Pit, Butte, Montana, USA) 1

James St. John
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Aplite dike in Butte Quartz Monzonite (Late Cretaceous, 76 Ma; roadcut next to Syndicate Pit, Butte, Montana, USA) 1