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Yosemite National Park, California. Glacial till, an unsorted mixture of boulders, sand, and clay exposed along the Tioga Road at Siesta Lake. Figure 60, U.S. Geological Survey Bulletin 1595.
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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. 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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Album caption and index card: Exfoliation in granite near Shuteye Peak in the Sierra Nevada Mountains. Man for scale. Shuteye Peak quadrangle. Madera County, California. n.d. (Same as U.S.G.S. photo no. 73). Published on page 38 in U.S. Geological Survey. Annual report. 1978.
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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. 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. 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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Yosemite National Park, California. Tioga moraine in the Harden Lake area, showing its sharp crest and abundant boulders exposed on the surface. Figure 64, U.S. Geological Survey Bulletin 1595.
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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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Yosemite National Park, California. Sheet joints follow topographic surfaces. Horizontal sheeting on a quarry face cut into a broad, level surface. Figure 40-A, U.S. Geological Survey Bulletin 1595.
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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. 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. Rocky shoreline on Isle Royale. Circa 1971. Figure 3, U.S. Geological Survey Bulletin 1309.
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Yosemite National Park, California. Imprints on the rock left by passing debris-laden ice. Glacial polish and striations. Polished surface layer flakes off, and this evidence of glaciation gradually disappears. This excellent and accessible exposure is at the foot of Polly Dome along Tioga Road on the north side of Tenaya Lake. Figure 55-B, U.S. Geological Survey Bulletin 1595.
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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. 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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Yosemite National Park, California. Jagged unglaciated spires of Unicorn Peak rising above the smooth shoulders of glacially scoured granite. The boundary between jagged sculpture above and smooth below, called the trimline, marks the upper limit of a former glacier along the valley wall. Figure 57, U.S. Geological Survey Bulletin 1595.
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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. 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.


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. 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. 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. Isle Royale National Park, Michigan. Rocky shoreline on Isle Royale. 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. Yosemite National Park, California. Glacial till, an unsorted mixture of boulders, sand, and clay exposed along the Tioga Road at Siesta Lake. Yosemite National Park, California. Tioga moraine in the Harden Lake area, showing its sharp crest and abundant boulders exposed on the surface. Exfoliation in granite near Shuteye Peak in the Sierra Nevada Mountains. Shuteye Peak quadrangle, Madera County, California. No date. 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. 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. 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. Isle Royale National Park, Michigan. Rocky shoreline on Isle Royale. 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. Yosemite National Park, California. Glacial till, an unsorted mixture of boulders, sand, and clay exposed along the Tioga Road at Siesta Lake. Yosemite National Park, California. Tioga moraine in the Harden Lake area, showing its sharp crest and abundant boulders exposed on the surface. Exfoliation in granite near Shuteye Peak in the Sierra Nevada Mountains. Shuteye Peak quadrangle, Madera County, California. No date.