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Handwritten information on back of photograph: Sea caves in shelf ice, Atka Bay.
Categories: Image;
Tags: Antarctica,
Antarctica Collection,
Atka Bay,
Davies, W.E. Collection,
Photographer,
Dakota sandstone where crossed by Highway 24. The formation consists of two sandstone and an intervening coal bearing shale unit, each about 25 feet thick. The shale and lower sandstone are cross bedded, shale bedding grading into sandstone bedding and the cross beds truncated by the top sandstone. The shale is interpreted as top set beds, the lower sandstone as foreset beds. View is nearly west. Wayne County, Utah. 1935.
Petroglyphs on Frontier sandstone at South Valley near Manilla. Pick is used for scale. Daggett County, Utah. August 1952.
Spring Mountains at the mouth of Porter Wash.
Categories: Image;
Tags: Anchor Mine,
Clark County, Nevada,
Hewett, D.F. Collection,
Mills, Mines, Quarries,
Photographer,
Album caption: (See No. 1276) Middle Devonian limestone in bluff on right bank Yukon River, opposite Woodchopper.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Alaska,
Mertie, J.B. Collection,
Photographer,
photo print
Handwritten information on back of photograph: Surface of shelf ice at Atka Bay.
Categories: Image;
Tags: Antarctica,
Antarctica Collection,
Atka Bay,
Davies, W.E. Collection,
Photographer,
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.
Categories: Image;
Tags: Hewett, D.F. Collection,
Nevada Professional Paper 162,
Photographer,
Professional Papers,
photo print
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.
Categories: Image;
Tags: Formations,
Hewett, D.F. Collection,
Nevada Professional Paper 162,
Photographer,
Professional Papers,
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.
Categories: Image;
Tags: Formations,
Hewett, D.F. Collection,
Mines,
Nevada Professional Paper 162,
Photographer,
Coral, as an indicator of past environments, is especially useful in determining past sea levels. Some types of corals, such as brain coral, must live close to the surface. As the sea level rises with the melting of the ice sheets, the corals must grow upward to survive. If the age of the corals can be determined, the past rate of sea level rise can be estimated. As the ice sheets melted rapidly during the latest ice age, sea levels rose at a rate of 8 feet in 100 years. Page 6, U.S. Geological Survey Circular 1085.
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.
Categories: Image;
Tags: Formations,
Hewett, D.F. Collection,
Nevada Professional Paper 162,
Photographer,
Professional Papers,
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.
Categories: Image;
Tags: Formations,
Hewett, D.F. Collection,
Mines,
Nevada Professional Paper 162,
Photographer,
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.
Categories: Image;
Tags: Formations,
Hewett, D.F. Collection,
Mines,
Nevada Professional Paper 162,
Photographer,
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.
Categories: Image;
Tags: Formations,
Hewett, D.F. Collection,
Nevada Professional Paper 162,
Photographer,
Professional Papers,
Album caption: First wild flowers of the season. June 2nd. Handwritten notes on album caption: Colville district, Northern Alaska region, Alaska. 1924.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Colville district, Northern Alaska region, Alaska,
Mertie, J.B. Collection,
Photographer,
photo print
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. Dolomitization has progressed outward from a median fracture 4 feet to the right and to the left (limit is shown by head of hammer). Clark County, Nevada. Circa 1921. Plate 18-B in U.S. Geological Survey. Professional paper 162. 1931.
Categories: Image;
Tags: Formations,
Hewett, D.F. Collection,
Nevada Professional Paper 162,
Photographer,
Professional Papers,
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.
Categories: Image;
Tags: Formations,
Hewett, D.F. Collection,
Mines,
Nevada Professional Paper 162,
Photographer,
Indiana Dunes National Lakeshore, Indiana. The unique environment of the Indiana Dunes supports a large variety of animals, such as opossums. Page 19 (bottom left), U.S. Geological Survey Circular 1085.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Hill, C.L. Collection,
Indiana Dunes National Lakeshore,
National Parks,
Photo color print,
Photographer
Album caption and index card: Boiling mud springs, N.W. of Imperial Junction. Imperial Co., Calif.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Imperial County, California,
Mendenhall, W.C. Collection,
Photographer,
photo print
Beds of the upper part of the Fort Union formation and lower part of the Wasatch formation exposed in the ravine that cuts through Blue Ridge in sec. 5, T. 46 N., R. 97 W. The conspicuous bed near the middle of the section is the massive conglomerate that forms the base of the Wasatch in this region. Hot Springs County, Wyoming. September 29, 1913. Plate 16 in U.S. Geological Survey. Professional paper 145. 1926.
Categories: Image;
Tags: Formations,
Hewett, D.F. Collection,
Photographer,
Professional Papers,
Wyoming Professional Paper 145,
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