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Hill consisting of Mancos shale near Delta, illustrating the barrenness of the shale slopes, and showing the occurrence of a zone of black shale about 300 feet above the base of the formation. Delta County, Colorado. 1907. Plate 4-A in U.S. Geological Survey Bulletin 510. 1912.
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The Rollins sandstone at its type locality near Rollins mine. The sandstone cliff, 100 feet high, is underlain by Mancos shale and overlain by the fresh-water division of the Mesaverde formation, the rocks of marine and brackish-water origin being absent. Delta County, Colorado. 1907.
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West slope of Paine mesa, showing an old graded surface dissected by erosion which has revealed the underlying rocks of unequal hardness. Delta County, Colorado. 1907. Plate 5-A in U.S. Geological Survey. Bulletin 510. 1912.
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Canyon between Delta and Grand Junction, general view looking upstream, the rocks dip to the left, away from the Uncompahgre Plateau or arch. The shaly rocks in the top of the canyon walls are of maroon color and the massive sandstone at the base is brick red. Delta County, Colorado 1907. Plate 76-A in U.S. Geological Survey. Bulletin 707. 1922.
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Typical exposure of coal bearing rocks east of Paonia, showing the lower three members of the Mesaverde formation, the Rollins sandstone, the Bowie shale, which here contains seven beds of coal, the Paonia shale, containing three beds of coal. The basal sandstone is about 200 feet thick. Delta County, Colorado. 1907. Plate 7-B in U.S. Geological Survey. Bulletin 510. 1912.
    map background search result map search result map Hill consisting of Mancos shale near Delta, illustrating the barrenness of the shale slopes. Delta County, Colorado. 1907. Hill consisting of Mancos shale near Delta, illustrating the barrenness of the shale slopes. Delta County, Colorado. 1907.