related tags: 303F32 343C35 5B6160 5C5F5F 67AC4E 8FAE6F 8FCD50 B3C7A5 B5BEAE basalt basalts falls flow flows gooseberry group keweenawan lake lava lavas mesoproterozoic minnesota north park precambrian proterozoic river series shore state supergroup superior volcanic 729465
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