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Album caption: Main vein of Wellington mine, Oro third level, cut by flat fault dipping south (see mine notebook): vein follows intrusive contact of porphyry; shale above porphyry and vein to right; jasper (?) to left. Breckenridge district, Summit County, Colorado. ca. 1926.
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Panoramas looking south from the south end of Teller Mountain near the Cashier Mine; glacial trenching of the Flattop peneplain is well shown. Summit County, Colorado. Circa 1927. Plate 8-B, U.S. Geological Survey, Professional paper 178. 1935.
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Album caption and index card: Unmineralized part of tungsten vein 200 feet west of large ore shoot, 100-foot level of Tungsten Vein mine. Note interior faulting and drag in barren sheeted zone (sz), showing the hanging wall (hw) has dropped. Boulder County, Colorado. Notes: Published as figure XXII in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption and index card: Photomicrograph of intrusion breccia of group 11 from Logan mine, 5 miles west of Boulder. Highly fragmented granite and some porphyry and early vein material lie in a biotite-flecked glassy groundmass that is partly silicified and sericitized. b, Fragment of biotite latite; g, glassy groundmass. Crossed nicols. Boulder County, Colorado. Notes: Published as figure XVII-A in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption and index card: Looking east at the Maxwell breccia reef near the junction of Fourmile Creek and North Boulder Creek. At this exposure the reef consists of brecciated Boulder Creek granite, moderately silicified and stained with hematite. The breccia reef has been mapped previously as pegmatite dike cutting the granite. Boulder County, Colorado. Notes: Published as figure XX-A in U.S.Geological Survey. Professional Paper 223. 1950.
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Aerial view looking north along the foothills from an altitude of 7,100 feet half a mile south of Morrison, shows the common topographic expression of the post Mississippian sedimentary formations and some of the younger erosion surfaces. Colorado. Circa 1932. Figure 6 with sketch, in U.S.Geological Survey Professional paper 223. 1950.
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Album caption and index card: Photomicrograph of gold-tungsten ore from Keklonga mine, Magnolia district. Sylvanite (s) in vuggy quartz (q3) which contains a little pyrite (py). Quartz (q3) and ferberite (fe) cut in early quartz. Boulder County, Colorado. Notes: Published as figure LXXIV-B in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption and index card: Photomicrograph of quartz-biotite schist from Idaho Springs formation at Nederland. Original bedding (nearly vertical in photograph) is intersected by shear planes sloping down to right at about 45°, and these shears are cut by later shears sloping to the left at 60°. b, Biotite; g, garnet; m, magnetite; q, quartz; fqb, crushed feldspar, quartz, and biotite. Plain light. Boulder County, Colorado. Notes: Published as figure VII-C in U.S.Geological Survey. Professional Paper 223. 1950.
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Aerial view looking north at Cheyenne Mountain from an altitude of 10,000 feet above Lytle, Cheyenne Mountain, type locality of the Cheyenne Mountain erosion surface, is a mass of Pre-Cambrian rock that has been thrust eastward onto Cretaceous strata at the south end of the Ute Pass fault. The fault line is marked by the abrupt termination of the foothills. El Paso County, Colorado. Circa 1932. Figure 16, with sketch, in U.S.Geological Survey Professional paper 223. 1950.
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Album caption and index card: Ore from Shaffer vein, Freeland mine, McClelland tunnel level, 35 feet east of Shaffer raise, 1,325 feet below surface. Ankerite (a) and pyrite (p) broken and cemented by dark fine-grained quartz (q) sphalerite (s) seamed by tetrahedrite (t) which is closely associated with dark quartz (q). Summit County, Colorado. Notes: Published as figure LX-F in U.S.Geological Survey. Professional Paper 223. 1950.
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Aerial view looking northeast across Berthoud Pass, from an altitude of 16, 200 feet, the position of the Berthoud Pass fault, which is responsible for the heavy ground in the Moffat tunnel 6 miles to the north is shown. Two cirques of Wisconsin age, which are cut into the Flattop peneplain at an altitude of slightly more than 12,000 feet, appear in the foreground and middle distance. Grand County, Colorado. Circa 1932. Figure 15, with sketch, in U.S.Geological Survey Professional paper 223. 1950.
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Album caption and index card: Photomicrograph of gold-tungsten ore from west end of 280-foot level of Keklonga mine, Magnolia district. Sylvanite (s) in crustified quartz (q₁ and q₂) associated with early coarse-grained ferberite. Fine-grained ferberite with a little quartz lies on the earlier quartz and is in turn incrusted and veined by late quartz (q3) containing some ferberite of three generations (f1, f2, and f3). py, Pyrite. Boulder County, Colorado. Notes: Published as figure LXXIV-A in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption: Looking N.W. from Stat. C. of the D.M.W.W. shows northeastward dipping Pierre Shale in the right middle distance and the anticlinal structure due to the Dakota Sandstone which has been cut through by the Snake River in left middle distance. Summit County, Colorado. No index card available. Notes: Published as plate VII-B in U.S. Geological Survey. Professional Paper 178. 1935.
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Typical coarse grained Pikes Peak granite on the summit of Bison Peak [Bison Mountain]. The rapid weathering of the granite along joints is shown in this view. This weathering gives rise to residual and balanced boulders characteristic of the areas where the Pikes Peak granite has been long exposed to mechanical and chemical weathering. Mans figure near base of upper cliff at right gives the scale. Park County, Colorado. Pre- 1950. Figure 9-D in U.S.Geological Survey Professional paper 223. 1950
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Panorama looking east up: the Snake River from the conical shale hill 1 mile west of the Montezuma quadrangle. Calcareous layers in the Pierre shale form the bluffs on the north side of the river; the low hill in the right middle distance is part of the terminal moraine west of Keystone. The outwash gravel makes the plain in the foreground and the middle distance from the Wisconsin glacier. Summit County, Colorado. circa 1928, Plate 8-A, U.S. Geological Survey, Professional paper 178. 1935
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Album caption and index card: Photomicrograph of copper-lead-zinc ore from Stevens mine, Argentine district. Chalcopyrite (cp) replaces sphalerite (s) and both are replaced by galena (g). q, Quartz. Summit County, Colorado. Notes: Published as figure LX-B in U.S.Geological Survey. Professional Paper 223. 1950.
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Northwestward across Nederland, showing erosion surfaces; the Flattop, Cheyenne Mountain and Overland Mountain surfaces can be seen. Boulder County, Colorado. 1930. Figure 21, in U.S. Geological Survey. Professional paper 245. 1953.
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Idaho Springs formation on east side of Grays Peak; shows sill like seams of aplite and pegmatite parallel to the nearly horizontal schistosity and cross-breaking branch seams. Clear Creek County, Colorado 1930. Plate 6-A, U.S. Geological Survey, Professional paper 178. 1935. Figure 7-B, U.S. Geological Survey, Professional paper 223, 1950.


map background search result map search result map Wellington mine. French Creek just beyond the mine. Breckenridge district. Summit County, Colorado. 1926. Main vein of Wellington mine. Summit County, Colorado. 1926. View from Station C, showing dipping Pierre Shale. Summit County, Colorado. circa 1932. Photomicrograph of quartz-biotite schist from Idaho Springs formation at Nederland. Boulder County, Colorado. circa 1932. Photomicrograph of intrusion breccia, west of Boulder. Boulder County, Colorado. circa 1932. Looking east at the Maxwell breccia reef near the junction of Fourmile and North Boulder Creeks. Boulder County, Colorado. circa 1932. Unmineralized tungsten vein. Boulder County, Colorado. circa 1932. Photomicrograph of copper-lead-zinc ore from Stevens mine. Summit County, Colorado. circa 1932. Ore from Shaffer vein, Freeland mine. Summit County, Colorado. circa 1932. Photomicrograph of gold-tungsten ore from west end of 280-foot level of Keklonga mine. Boulder County, Colorado. circa 1932. Photomicrograph of gold-tungsten ore from Keklonga mine. Boulder County, Colorado. circa 1932. Wellington mine. French Creek just beyond the mine. Breckenridge district. Summit County, Colorado. 1926. Main vein of Wellington mine. Summit County, Colorado. 1926. View from Station C, showing dipping Pierre Shale. Summit County, Colorado. circa 1932. Photomicrograph of quartz-biotite schist from Idaho Springs formation at Nederland. Boulder County, Colorado. circa 1932. Photomicrograph of intrusion breccia, west of Boulder. Boulder County, Colorado. circa 1932. Looking east at the Maxwell breccia reef near the junction of Fourmile and North Boulder Creeks. Boulder County, Colorado. circa 1932. Unmineralized tungsten vein. Boulder County, Colorado. circa 1932. Photomicrograph of copper-lead-zinc ore from Stevens mine. Summit County, Colorado. circa 1932. Ore from Shaffer vein, Freeland mine. Summit County, Colorado. circa 1932. Photomicrograph of gold-tungsten ore from west end of 280-foot level of Keklonga mine. Boulder County, Colorado. circa 1932. Photomicrograph of gold-tungsten ore from Keklonga mine. Boulder County, Colorado. circa 1932.