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out of 5 stars
05 Jun 2014 | Contributor(s):: William I Rose
The site interprets the exposed section of the Mesoproterozoic mid-continent rift, the Keweenaw Peninsula and Isle Royale, Michigan. It includes some of Earth's most voluminous lava flows, a large thrust fault, a vast sequence of fluvial red beds and unique native copper deposits. The geology...