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Isle Royale National Park, Michigan. Monument Rock, a stack associated with the shoreline of postglacial Lake Minong. Photo by T. Haas, U.S. National Park Service, circa 1971. Figure 17, U.S. Geological Survey Professional paper 754-A; Figure 67, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Zone of spheroidal weathering in a basalt lava flow. This zone of partly decomposed rock escaped removal by glacial erosion because of its protected location. Circa 1971. Figure 7, U.S. Geological Survey Professional paper 754-A.
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Isle Royale National Park, Michigan. Conglomerate with native copper from the Island mine. This specimen has been sawed and lightly polished so that the copper reflects light and shows up as light-colored, irregular-shaped patches. The specimen is 8 centimeters wide. Circa 1971. Figure 71, U.S. Geological Survey Bulletin 1309.


    map background search result map search result map Zone of spheroidal weathering in a basalt lava flow. Isle Royale National Park, Michigan. 1971. Monument Rock, a stack associated with the shoreline of postglacial Lake Minong. Isle Royale National Park, Michigan. 1971. Conglomerate with native copper from the Island mine. Isle Royale National Park, Michigan. Circa 1971. Zone of spheroidal weathering in a basalt lava flow. Isle Royale National Park, Michigan. 1971. Monument Rock, a stack associated with the shoreline of postglacial Lake Minong. Isle Royale National Park, Michigan. 1971. Conglomerate with native copper from the Island mine. Isle Royale National Park, Michigan. Circa 1971.