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Stratum of limestone preserved unaltered in midst of dolomitized limestone 200 feet above the base of the Bird Spring formation in sec. 4, T. 25 S., R. 58 E., the workings of the Hoosier mine lie in the foreground. Clark County, Nevada. Circa 1921. Plate 19-A, labels and a graphic, in U.S. Geological Survey. Professional paper 162. 1931.
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Crystal Pass limestone exposed in a cliff 15 feet high in sec. 30, T.26, S. R. 59 E., south end of Spring Mountains. Clark County, Nevada. December 12, 1924. Plate 5-B in U.S. Geological Survey. Professional paper 162. 1931.
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Thin bedded dolomite of the Goodsprings formation (upper Cambrian) thrust upon the Aztec sandstone (Jurassic) in northeast corner of sec. 21, T. 22 S., R. 58 E. The contact marks the trace of the Keystone thrust. The curve in the trace is due to local irregularities in the surface and to perspective. Clark County, Nevada. Circa 1921. Plate 14-A, with a graphic, in U.S. Geological Survey. Professional paper 162. 1931.
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Ninety-nine Mine, W 1/2 sec. 15, T. 23 S., R. 58 E., the ridge on the left is made up of limestones near the base of the Bird Spring formation which dip eastward (left). The Ninety-nine fault passes through the ravine in the center. Clark County, Nevada. Circa 1921. Plate 31-B in U.S. Geological Survey. Professional paper 162. 1931.
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Aztec sandstone overlying Chinle formation in sec. 22, T. 22 S., R. 58 E., the Aztec sandstone is overlain by thin bedded dolomite of the Goodsprings formation from which it separated by the Keystone thrust fault. Compare with Hewett, photo 365. Clark County, Nevada. Circa 1921. Plate 8-B in U.S. Geological Survey. Professional paper 162. 1931.
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Keystone mine NW 1/4 sec. 30, T. 24 S. R. 58 E. The slopes back of the mine are made up of thin bedded dolomite of the Goodsprings formation. Clark County, Nevada. Circa 1921. Plate 31-A in U.S. Geological Survey. Professional paper 162. 1931.
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Dolomitized zone (light) in bed of limestone of the Bird Spring formation in sec. 33, T. 25 S., R.58 E., view taken diagonally downward toward a bedding plane. Clark County, Nevada. Circa 1921.
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Trace of the Keystone thrust west of Goodsprings in the SW 1/4 sec. 29, T. 24 S., R. 58 E; on the right crumpled limestones (now dolomitized) of the Bird Spring from (Pennsylvanian): on the left thin bedded dolomite of the Goodsprings formation (Upper Cambrian). The trace is marked by a reddish zone formed by the oxidation of pyrite the curve is due to relief and perspective. Clark County, Nevada. Circa 1921. Plate 14-B, with a graphic, in U.S. Geological Survey. Professional paper 162. 1931.
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Yellow pin mine and camp, NW 1/4 sec. 20, T. 24 S., R.54 E., the slopes of Shenandoah Peak (crest of ridge) are made up of thin bedded limestones of the Bird Spring formation. The porphyry sill underlies the smooth slope behind the hoist. Clark County, Nevada. Circa 1921. Plate 35-A in U.S. Geological Survey. Professional paper 162. 1931.
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Colemanite deposit near Callville Wash. Looking east along outcrop of colemanite bed, which extends from near center to right side of view. Clark County, Nevada. 1915. Plate 2-B in U.S. Geological Survey Bulletin 735. 1923.
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Potosi mine, south center of sec. 12, T. 23 S., R. 57 E., the mine workings explore a zone at the base of the Yellowpine limestone. Clark County, Nevada. Circa 1921. Plate 33-B in U.S. Geological Survey. Professional paper 162. 1931.
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Wedge of Bullion dolomite separated by faults from blocks of Yellowpine limestone, view northwest toward ridge west of the Bullion mine in sec. 23, T. 25 S., R. 58 E. Clark County, Nevada. Circa 1921. Plate 15-B, with graphics, in U.S. Geological Survey. Professional paper 162. 1931.
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Thin bedded dolomites of the upper part of the Goodsprings formation in secs. 28, 26 and 30, T. 24 S., R.58E: due east from the hill (altitude 5,124 feet west of Kirby Wash toward Columbia Pass and Goodsprings. The town is hidden by the hill in the middle distance. Clark County, Nevada. Circa 1921. Plate 5-A in U.S. Geological Survey. Professional paper 162. 1931.
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Colemanite deposit near Callville Wash. Looking west along outcrop colemanite bed, which extends from center left to ridge near center. Clark County, Nevada. 1915. Plate 2-B in U.S. Geological Survey Bulletin 735. 1923.
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Goose egg structure in limestone beds associated with colemanite deposit. Near Callville Wash, Clark County, Nevada. 1915. Plate 3-A in U.S. Geological Survey Bulletin 735. 1923.
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Arrowhead limestone southeast of the Yellow Pine mine in center of sec. 20 T. 54 S., R. 58 E. Clark County, Nevada. December 13, 1924. Plate 6-B in U.S. Geological Survey. Professional paper 162. 1931.
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Supai formation has overlain by the Kaibab limestone east of Cottonwood Pass, in sec. 13 T. 23 S., R. 58 E. The conspicuous sandstone 460 feet thick forms the middle part of the Supai formation. It is overlain successively by gypsum bearing sandy shale at the top of that formation and the two massive beds of limestone of the Kaibab limestone. Potosi Mountain in the distance. Clark County, Nevada. Circa 1921. Plate 8-A in U.S. Geological Survey. Professional paper 162. 1931.
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Boss mine, NE 1/4 sec. 34, T. 24 S., R. 57 E. The workings explore a crushed zone which, lies between dolomitized limestone of the Monte Cristo formation on the right (east) and similar rocks of the Sultan formation on the left (west). Clark County, Nevada. Circa 1921.
map background search result map search result map Colemanite deposit near Callville Wash. Clark County, Nevada. 1915. Colemanite deposit near Callville Wash. Clark County, Nevada. 1915. Limestone beds associated with colemanite deposit. Clark County, Nevada. 1915. WMR 056 - Production of Magnesia from Sloan Dolomite Deposit. Clark County, Nevada. 1943. Colemanite deposit near Callville Wash. Clark County, Nevada. 1915. Colemanite deposit near Callville Wash. Clark County, Nevada. 1915. Limestone beds associated with colemanite deposit. Clark County, Nevada. 1915. WMR 056 - Production of Magnesia from Sloan Dolomite Deposit. Clark County, Nevada. 1943.