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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. Specimen of Prehnite amygdules. Note the radiating fibrous structure with development of "eyes." Circa 1971. Figure 74, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Modern drying mud showing features similar to ancient desiccation cracks and raindrop impressions on siltstone. Photo by D.M. Baird, circa 1971. Figure 36-C, U.S. Geological Survey Bulletin 1309.
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Yosemite National Park, California. Johnson Granite Porphyry, showing potassium feldspar phenocrysts set in a fine-grained matrix. Figure 21, U.S. Geological Survey Bulletin 1595.
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Isle Royale National Park, Michigan. Fingerlike promontories on the northeast end of Isle Royale. Photo by A. Eliason, U.S. National Park Service, circa 1971. Figure 4, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Fossil shell in chert pebble. Circa 1971. Figure 50, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Coarse ophite with knobby weathered Surface from the outh side of Raspberry Island. The penknife is 7 centimeters long. Circa 1971. Figure 5, U.S. Geological Survey Professional paper 754-C; Figure 13, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Prehnite amygdules in beach pebble derived from lava flow. Long dimension of the pebble is 5 centimeters. Circa 1971. Figure 73, U.S. Geological Survey Bulletin 1309.
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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.
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Isle Royale National Park, Michigan. Specimen of ancient raindrop impressions on siltstone at Isle Royale. Circa 1971. Figure 36-B, U.S. Geological Survey Bulletin 1309.
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Yosemite National Park, California. Staircase Falls. Stair treads follow joints inclined eastward. Photo by T.R. Alpha. Figure 35, U.S. Geological Survey Bulletin 1595.


    map background search result map search result map Monument Rock, a stack associated with the shoreline of postglacial Lake Minong. Isle Royale National Park, Michigan. 1971. Isle Royale National Park, Michigan. Coarse ophite with knobby weathered Surface from the outh side of Raspberry Island. Circa 1971. Yosemite National Park, California. Staircase Falls. Stair treads follow joints inclined eastward. Isle Royale National Park, Michigan. Fingerlike promontories on the northeast end of Isle Royale.  Circa 1971. Isle Royale National Park, Michigan. Specimen of ancient raindrop impressions on siltstone at Isle Royale.  Circa 1971. Modern drying mud showing features similar to ancient desiccation cracks and raindrop impressions on siltstone. Isle Royale National Park, Michigan. Circa 1971. Isle Royale National Park, Michigan. Prehnite amygdules in beach pebble derived from lava flow.  Circa 1971. Isle Royale National Park, Michigan. Fossil shell in chert pebble. Circa 1971. Isle Royale National Park, Michigan. Specimen of Prehnite amygdules. Note the radiating fibrous structure with development of "eyes." Circa 1971. Conglomerate with native copper from the Island mine. Isle Royale National Park, Michigan. Circa 1971. Monument Rock, a stack associated with the shoreline of postglacial Lake Minong. Isle Royale National Park, Michigan. 1971. Isle Royale National Park, Michigan. Coarse ophite with knobby weathered Surface from the outh side of Raspberry Island. Circa 1971. Isle Royale National Park, Michigan. Fingerlike promontories on the northeast end of Isle Royale.  Circa 1971. Isle Royale National Park, Michigan. Specimen of ancient raindrop impressions on siltstone at Isle Royale.  Circa 1971. Modern drying mud showing features similar to ancient desiccation cracks and raindrop impressions on siltstone. Isle Royale National Park, Michigan. Circa 1971. Isle Royale National Park, Michigan. Prehnite amygdules in beach pebble derived from lava flow.  Circa 1971. Isle Royale National Park, Michigan. Fossil shell in chert pebble. Circa 1971. Isle Royale National Park, Michigan. Specimen of Prehnite amygdules. Note the radiating fibrous structure with development of "eyes." Circa 1971. Conglomerate with native copper from the Island mine. Isle Royale National Park, Michigan. Circa 1971. Yosemite National Park, California. Staircase Falls. Stair treads follow joints inclined eastward.