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Filters: partyWithName: Bergendahl, Maximilian Hilmar (X)

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Photomicrograph of polished section. Late fine-grained pyrite deposited contemporaneously with quartz and carbonate that are later than sphalerite and galena. X 60, Wilfley mine. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 15-C. 1971.
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Photomicrograph of polished section. Large grains of early pyrite coated with marcasite. Sphalerite and chalcopyrite fill cavity between pyrite grains. X 175, Lucky Strike mine. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 18-B. 1971.
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Migmatite, showing typical wavy foliation, Pacific Gulch. Dark layers are biotite and oligoclase-andesin;, light layers are mainly quartz, microcline, and oligoclase- andesine. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 6. 1971.
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Migmatite, showing contorted layering and ptygmatic folds, Pacific Gulch. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 7. 1971.
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Photomicrograph of polished section. Pyrrhotite partly replaced by pyrite and marcasite. Galena cuts across earlier pyrrhotite at top. Dark-gray areas are quartz. X 60, Michigan mine. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 15-B. 1971.
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Photomicrograph of polished section. Vugs Composite bleb of pyrrhotite, galena, and chalcopyrite in sphalerite. Other minerals are pyrite and carbonate gangue. X500, Wilfley mine. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 15-D. 1971.
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Contact of granulite (left) and banded gneiss (right), Tenmile Range. Contact is gradational through 2-foot interval in vicinity of hammer. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 4. 1971.
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Panorama with image 7, 8, and 9. Lake and Summit Counties, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 8. 1971.
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Photomicrograph of polished section. Apophyses of galena cutting across sphalerite. Quartz is gangue. X 175, Michigan-Snowbank mine. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 18-D. 1971.
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Photomicrograph of polished section. Cellular marcasite coating fractured pyrite grains. X 60, Michigan-Snowbank mine. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 18-C. 1971.
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Polished slab of sulfide ore from the Wilfley mine, showing banding and graphic texture. Gray is pyrite; black is sphalerite. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 11. 1971.
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Town of Kokomo from the southeast. Jacque Peak in the background consists of red beds of the Maroon Formation, intercalated with sills of Elk Mountain Porphyry. Summit County, Colorado. 1963. Published in US Geological Survey Professional Paper 652, figure 2. 1971.
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Boudinage structure in banded gneiss, Tenmile Range. Felsic material between ends of boudins is very coarse grained. Summit County, Colorado. ca. 1963.
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Panorama with image 7, 8, and 9. View from the west of southern part of Tenmile Range, showing approximate trace of Mosquito fault and the abrupt change of topography across the fault. Rounded slopes in foreground are of Minturn and Maroon Formations. Jagged ridges and cirque walls consist of Precambrian crystalline rocks. Lake and Summit Counties, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 8. 1971.
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Panorama with image 7, 8, and 9. Lake and Summit Counties, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 8. 1971.
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Photomicrograph of polished section. Grains of pyrrhotite partly replaced by pyrite and marcasite, and etched by sphalerite. Galena cuts sphalerite and pyrrhotite. X 60, Triangle mine. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 18-A. 1971.
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Photomicrograph of polished section. Feathery laths of molybdenite in quartz gangue. X 60, unnamed prospect in Cresson Gulch. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 19-C. 1971.
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Banded gneiss cut by pegmatite, Humbug Creek. Dark layers are hornblende, andesine, and minor quartz; light layers are quartz, microcline, and oligoclase-andesine. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 3. 1971.
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Solid galena from the Lucky Strike-Victory mine. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 13. 1971.
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Photomicrograph of polished section. Chalcopyrite partly altered to covellite. Other minerals are pyrite and quartz. X 60, Gold Crest mine. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 19-B. 1971.
map background search result map search result map Town of Kokomo from the southeast. Jacque Peak in the background consists of red beds of the Maroon Formation, intercalated with sills of Elk Mountain Porphyry. Summit County, Colorado. 1963. Town of Kokomo from the southeast. Jacque Peak in the background consists of red beds of the Maroon Formation, intercalated with sills of Elk Mountain Porphyry. Summit County, Colorado. 1963.