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Isle Royale National Park, Michigan. Slabby sandstone outcrop on Stone House Island. Circa 1971. Figure 28, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Chlorastrolite amygdules showing characteristic segmented pattern. Circa 1971. Figure 72, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Tuff-breccia overlying the Greenstone Flow. Fragmental character is clearly evident in this outcrop, which is close to the base of the pyroclastic unit on the north shore of Tobin Harbor near Newman Island. The knife is 7 centimeters long. Circa 1971. Figure 20, U.S. Geological Survey Professional paper 754-C; Figure 20, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Amygdaloid with calcite amygdules and calcite vein at top. Circa 1971. Figure 14, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Copper Harbor Conglomerate sloping gently southeast into Lake Superior near Attwood Beach. Circa 1971. Figure 26, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Agate typical of those occurring in the Tuff-breccia overlying the Greenstone Flow. The knife is 7 centimeters long. Circa 1971. Figure 21, U.S. Geological Survey Professional paper 754-C; Figure 76, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Characteristic textures of volcanic rocks On Isle Royale: pegmatite from the differentiated zone of the Greenstone Flow on the east end of Passage Island. This rock has a texture in which all of the minerals, especially the plagioclase, are larger when compared with those in most of the other rock types; the elongate plagioclase laths give the rock a matted appearance. Circa 1971. Figure 4-E, U.S. Geological Survey Professional paper 754-C; Figure 12-E, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Rocky shoreline on Isle Royale. Circa 1971. Figure 3, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Columnar jointing in the Edwards Island Flow on the north side of Edwards Island. Circa 1971. Figure 14, U.S. Geological Survey Professional paper 754-C; Figure 18, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Glacial striations near Moskey Basin Campground. Circa 1971. Figure 5, U.S. Geological Survey Professional paper 754-A; Figure 47, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Glacially rounded and striated outcrop near the portage trail at Pickerel Cove. Circa 1971. Figure 6, U.S. Geological Survey Professional paper 754-A; Figure 48, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Sandstone pebble beach west of Little Boat Harbor.U.S. National Park Service boat "D.J. Tobin" provided transportation for geologic studies. Circa 1971. Figure 27, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Breccia occurring above the Amygdaloid Island Flow on the south shore at the east end of Amygdaloid Island. Circa 1971. Figure 19, U.S. Geological Survey Professional paper 754-C.
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Isle Royale National Park, Michigan. Cliff in Copper Harbor Conglomerate on the north side of Feldtmann Ridge. Circa 1971. Figure 29, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Ancient desiccation cracks on siltstone at Isle Royale compared to similar features on modern drying mud. Circa 1971. Figure 36-A, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Across Duncan Bay from Lookout Louise. Circa 1971. Figure 5, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Porphyrite from the Huginnin Flow on the beach at Huginnin Cove. The pencil is approximately 15 centimeters long. Circa 1971. Figure 12, U.S. Geological Survey Professional paper 754-C; Figure 23, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Hoist and boiler remains at the island mine, abandoned in 1877. Circa 1971. Figure 2, 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. Beach cobble of porphyrite from the Grace Island Flow on Grace Island with a rather unusual distribution of plagioclase phenocrysts. The dark spots are amygdules of pumpellyite. The long dimension is 15 centimeters. Circa 1971. Figure 13, U.S. Geological Survey Professional paper 754-C; Figure 24, U.S. Geological Survey Bulletin 1309.


map background search result map search result map Isle Royale National Park, Michigan. Glacial striations near Moskey Basin Campground. Circa 1971. Isle Royale National Park, Michigan. Glacially rounded and striated outcrop near the portage trail at Pickerel Cove. Circa 1971. Zone of spheroidal weathering in a basalt lava flow. Isle Royale National Park, Michigan. 1971. Characteristic textures of volcanic rocks On Isle Royale. Isle Royale National Park, Keweenaw County, Michigan. 1971. Isle Royale National Park, Michigan. Porphyrite from the Huginnin Flow on the beach at Huginnin Cove. Circa 1971. Isle Royale National Park, Michigan. Beach cobble of porphyrite from the Grace Island Flow on Grace Island with a rather unusual distribution of plagioclase phenocrysts. 1971. Isle Royale National Park, Michigan. Columnar jointing in the Edwards Island Flow on the north side of Edwards Island. 1971. Isle Royale National Park, Michigan. Breccia occurring above the Amygdaloid Island Flow on the south shore at the east end of Amygdaloid Island. Circa 1971. Isle Royale National Park, Michigan. Tuff-breccia overlying the Greenstone Flow. Fragmental character is clearly evident in this outcrop, which is close to the base of the pyroclastic unit on the north shore of Tobin Harbor near Newman Island . Circa 1971. Isle Royale National Park, Michigan. Agate typical of those occurring in the Tuff-breccia overlying the Greenstone Flow. 1971. Hoist and boiler remains at the island mine. Isle Royale National Park, Houghton County, Michigan. 1971. Isle Royale National Park, Michigan. Rocky shoreline on Isle Royale. Circa 1971. Isle Royale National Park, Michigan. Across Duncan Bay from Lookout Louise. Circa 1971. Isle Royale National Park, Michigan. Amygdaloid with calcite amygdules and calcite vein at top. Circa 1971. Isle Royale National Park, Michigan. Copper Harbor Conglomerate sloping gently southeast into Lake Superior near Attwood Beach. Circa 1971. Isle Royale National Park, Michigan. Sandstone pebble beach west of Little Boat Harbor.  Circa 1971. Isle Royale National Park, Michigan. Slabby sandstone outcrop on Stone House Island. 1971. Isle Royale National Park, Michigan. Cliff in Copper Harbor Conglomerate on the north side of Feldtmann Ridge.  Circa 1971. Isle Royale National Park, Michigan. Chlorastrolite amygdules showing characteristic segmented pattern.  Circa 1971. Isle Royale National Park, Michigan. Ancient desiccation cracks on siltstone at Isle Royale compared to similar features on modern drying mud. Circa 1971. Isle Royale National Park, Michigan. Glacial striations near Moskey Basin Campground. Circa 1971. Isle Royale National Park, Michigan. Glacially rounded and striated outcrop near the portage trail at Pickerel Cove. Circa 1971. Zone of spheroidal weathering in a basalt lava flow. Isle Royale National Park, Michigan. 1971. Characteristic textures of volcanic rocks On Isle Royale. Isle Royale National Park, Keweenaw County, Michigan. 1971. Isle Royale National Park, Michigan. Porphyrite from the Huginnin Flow on the beach at Huginnin Cove. Circa 1971. Isle Royale National Park, Michigan. Beach cobble of porphyrite from the Grace Island Flow on Grace Island with a rather unusual distribution of plagioclase phenocrysts. 1971. Isle Royale National Park, Michigan. Columnar jointing in the Edwards Island Flow on the north side of Edwards Island. 1971. Isle Royale National Park, Michigan. Breccia occurring above the Amygdaloid Island Flow on the south shore at the east end of Amygdaloid Island. Circa 1971. Isle Royale National Park, Michigan. Tuff-breccia overlying the Greenstone Flow. Fragmental character is clearly evident in this outcrop, which is close to the base of the pyroclastic unit on the north shore of Tobin Harbor near Newman Island . Circa 1971. Isle Royale National Park, Michigan. Agate typical of those occurring in the Tuff-breccia overlying the Greenstone Flow. 1971. Hoist and boiler remains at the island mine. Isle Royale National Park, Houghton County, Michigan. 1971. Isle Royale National Park, Michigan. Rocky shoreline on Isle Royale. Circa 1971. Isle Royale National Park, Michigan. Across Duncan Bay from Lookout Louise. Circa 1971. Isle Royale National Park, Michigan. Amygdaloid with calcite amygdules and calcite vein at top. Circa 1971. Isle Royale National Park, Michigan. Copper Harbor Conglomerate sloping gently southeast into Lake Superior near Attwood Beach. Circa 1971. Isle Royale National Park, Michigan. Sandstone pebble beach west of Little Boat Harbor.  Circa 1971. Isle Royale National Park, Michigan. Slabby sandstone outcrop on Stone House Island. 1971. Isle Royale National Park, Michigan. Cliff in Copper Harbor Conglomerate on the north side of Feldtmann Ridge.  Circa 1971. Isle Royale National Park, Michigan. Chlorastrolite amygdules showing characteristic segmented pattern.  Circa 1971. Isle Royale National Park, Michigan. Ancient desiccation cracks on siltstone at Isle Royale compared to similar features on modern drying mud. Circa 1971.