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Dike Ridge from Porphyry Basin, shows characteristic cliffs of San Juan tuff- agglomerate and overlying Potosi volcanic series, with four notable dikes of monzonite porphyry, which in some places stand out as walls. Hinsdale County, Colorado. August 4, 1904. Figure 8 in U.S. Geological Survey. Folio 153. 1907.
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Northward dipping strata in the Uncompahgre valley at Ouray; the clearly defined layers are of Paleozoic and Mesozoic age. They were uplifted and arched at the end of the Mesozoic era. Overlying the sedimentary rocks are thick accumulations of volcanic rocks. The village of Ouray is located on a torrential fan. Ouray County, Colorado. August 29, 1904. Plate 7-A, U.S. Geological Survey Professional paper 166. 1932.
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Torrential fans on south slope of Rio Grande below Deep Creek, from slope of Sheep Mountain; ravines cutting into forested hillside of San Juan tuff are depositing most of the detritus in torrential fans below. Rio Grande County, Colorado. August 12, 1901. Figure 5 in U.S. Geological Survey. Folio 120. 1905.
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Porphyry dike cutting San Juan tuff on divide at head of Dexter Creek, illustrates the common texture, rude bedding and general appearance of the San Juan tuff-agglomerate where little altered. The dike is one of several crossing Cow Creek with similar wall-lake outcrops. Ouray County, Colorado. August 8, 1904. Figure 5 in U.S. Geological Survey. Folio 153. 1907.
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Album caption: Just above "McCormick's Ranch" in the Animas Valley. The plateau is to the southeast. 2 p.m., exposure 1/25, F8. La Plata County, Colorado. October 20, 1901. Index card: Animas valley and plateaus to southwest. La Plata County, Colorado 1901.
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Small pond occupying depressions on trench between landslide blocks near head of Mineral Creek, Red Mountain landslide district, Silverton quadrangle. San Juan County, Colorado. 9 a.m. September 5, 1900. Plate 7-A in U.S. Geological Survey. Professional paper 67. 1909.
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The Amphitheater and cliffs to the north from a point west of Uncompahgre River, illustrates the unconformity below the Dolores formation. This nearly horizontal strata at the level of the point of view are above the unconformity; the inclined strata below belong to the Hermosa and Cutler formations. The back wall of The Amphitheater is San Juan tuff-agglomerate; its floor is landslide debris. Ouray County, Colorado. August 22, 1904. Figure 7 in U.S. Geological Survey. Folio 153. 1907.
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Rock stream in lower portion of Silver basin, Silverton quadrangle, the outer rim of lighter color than the rest of the stream consists of debris of rhyolite of the Potosi volcanic series; the rest of the detritus of dark tone was derived from andesitic rocks of the Silverton volcanic series. Ouray County, Colorado. 11 a.m. September 18, 1900. Plate 13-A in U.S. Geological Survey. Professional paper 67. 1909.
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Album caption: Florida River near s line of map. Looking up the Florida River. 2:30 pm, exposure 1.7, F64. La Plata County, Colorado. October 22, 1901. Index card: Florida River near south line of Durango quadrangle. La Plata County, Colorado. 1901.
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Rock stream in lower portion of Silver basin, Silverton quadrangle, detail of surface; the outer rim of the rhyolite debris indicated in Howe photo 50, is shown on the left. Ouray County, Colorado. 1#1:30 a.m. September 18, 1900. Plate 14-A in U.S. Geological Survey. Professional paper 67. 1909.
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Scarp of Hermosa formation east of Engineer Mountain, illustrates the manner in which massive limestone and sandstone alternate with soft shale, looking south. Pass of Coalbank hill on the right. Mountains near Silverton in the distance. San Juan County, Colorado. 1909. Figure 2 in U.S. Geological Survey. Folio 171. 1909.
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Red Mountain landslide district, Silverton quadrangle, typical landslide blocks and ridges with intervening trenches, at divide between Red Mountain and Mineral Creeks. San Juan County, Colorado. 9:45 a.m. September 5, 1900. Plate 8-A in U.S. Geological Survey. Professional paper 67. 1909.
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Glaciated surface in Animas Canyon; shows light gray Twilight gneissose granite cutting dark amphibolites. San Juan County, Colorado. August 11, 1901. Figure 10 in U.S. Geological Survey. Folio 131. 1905.
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Looking westward across Cow Creek and Uncompahgre valley from a hill south of Lou Creek, illustrating the gravel deposits of the Uncompahgre valley. In the central foreground is a bench of the later terrace gravels trenched by Lou Creek. At the extreme right is the dip slope of the earlier terrace gravels, which also cap the hill from which the view is taken. The two gravel covered mesas to the right of the center lie just beyond Cow Creek. Beyond these mesas is the valley of Uncompahgre and beyond that is the slope covered by earlier gravels, rising to Horse Fly Peak, a small prominence on the skyline near the center of the view. At that point lie older glacial gravels. The left half of the view embraces the hills...
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Looking westward across Cow Creek and Uncompahgre valley from a hill south of Lou Creek, illustrating the gravel deposits of the Uncompahgre valley. In the central foreground is a bench of the later terrace gravels trenched by Lou Creek. At the extreme right is the dip slope of the earlier terrace gravels, which also cap the hill from which the view is taken. The two gravel covered mesas to the right of the center lie just beyond Cow Creek. Beyond these mesas is the valley of Uncompahgre and beyond that is the slope covered by earlier gravels, rising to Horse Fly Peak, a small prominence on the skyline near the center of the view. At that point lie older glacial gravels. The left half of the view embraces the hills...
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Inclusions of amphibole-schist in Twilight gneissose granite, illustrates manner in which the gneissose banding follows the irregular outlines of included schist fragments. San Juan County, Colorado. August 11, 1901. Figure 11 in U.S. Geological Survey. Folio 131. 1905.
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Mount Garfield, from the northern end of Elk Park, Animas Canyon; near center of picture the vertical strata of Uncompahgre quartzites are shown. The well defined ravine below and to the left of Mount Garfield marks the fault which bounds the quartzites at the river. The peak of Mount Garfield itself consists of northward-dipping quartzites, which have thrust over the Archean schists. San Juan County, Colorado. August 11, 1901. Figure 6 in U.S. Geological Survey. Folio 131. 1905.
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Details of landslide topography southeast of Corkscrew Gulch, Red Mountain district, Silverton quadrangle, the ridge sparsely covered by trees consists of rocks in place; the material in the foreground is landslide debris alone. Ouray County, Colorado. 10:50 a.m. September 14, 1900. Plate 8-B in U.S. Geological Survey. Professional paper 67. 1909.
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Hornblende schist irregularly intruded by Twilight granite, Little Cascade Creek. La Plata County, Colorado. 1909. Figure 12 in U.S. Geological Survey. Folio 171. 1909.
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Fold in carboniferous strata on west side of Uncompahgre River south of Corbett Gulch; from point on east side of river near trail to Bright Diamond mine. The Triassic and later beds unconformably overlie these folded strata, but the unconformity is hidden. Ouray County, Colorado. August 19, 1904. Figure 9 in U.S. Geological Survey. Folio 153. 1907.
map background search result map search result map Hornblende schist irregularly intruded by Twilight granite, Little Cascade Creek. La Plata County, Colorado. 1909. Dike Ridge from Porphyry Basin, shows characteristic cliffs of San Juan tuff. Hinsdale County, Colorado. 1904. The Amphitheater and cliffs to the north from a point west of Uncompahgre River, illustrates the unconformity below the Dolores formation. Ouray County, Colorado. 1904. Northward dipping strata in the Uncompahgre valley at Ouray. Ouray County, Colorado. 1904. Looking westward across Cow Creek and Uncompahgre valley from a hill south of Lou Creek. Ouray County, Colorado. 1904. Looking up the Florida River. La Plata County, Colorado. 1901. Animas Valley. La Plata County, Colorado. 1901. The Amphitheater and cliffs to the north from a point west of Uncompahgre River, illustrates the unconformity below the Dolores formation. Ouray County, Colorado. 1904. Northward dipping strata in the Uncompahgre valley at Ouray. Ouray County, Colorado. 1904. Looking westward across Cow Creek and Uncompahgre valley from a hill south of Lou Creek. Ouray County, Colorado. 1904. Dike Ridge from Porphyry Basin, shows characteristic cliffs of San Juan tuff. Hinsdale County, Colorado. 1904. Hornblende schist irregularly intruded by Twilight granite, Little Cascade Creek. La Plata County, Colorado. 1909. Looking up the Florida River. La Plata County, Colorado. 1901. Animas Valley. La Plata County, Colorado. 1901.