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Seite 67 - B 165. Contributions to the geology of Maine, by HS Williams and HE Gregory. 1900.
Seite 67 - B 104. Glaciation of the Yellowstone Valley north of the Park, by WH Weed. 1893. 41 pp., 4 pis.
Seite 19 - The formations cross the eastern part of the State, and underlie all of the area west of the vicinity of the ninetyseventh meridian, but are so deeply buried under drift and loess that outcrops are rarely visible. The most extensive exposures are along...
Seite 19 - ¡obrara formation. They have a thickness of about -450 feet to the east, but thicken to the west. At the base there are about 200 feet of dark shales, overlain by slabby limestones of the Greenhorn formation containing...
Seite 20 - Coal Measure or Pennsylvania age. The Permian outcrops are probably restricted to the valley of Big Blue River from Beatrice southward. The rocks are mainly magnesian limestones of light color, with interbedded shales. They are extensively exposed south of Beatrice, at Rockford, Bluesprings, Wymore, and Holmesville. The other Carboniferous members appear to comprise the Cottonwood and Wabaunsee formations of the Kansas geologists. They consist of limestones, shales, and sandstones, which contain...
Seite 17 - In its typical development the Ogalalla formation is a calcareous grit or soft limestone containing a greater or less amount of intermixed clay and sand, with pebbles of various kinds sprinkled through it locally, and a basal bed of conglomerate at many localities .... The pebbles it contains comprise many crystalline rocks, which appear to have come from the Rocky Mountains.
Seite 68 - Dakotas, by NH Darton, in Seventeenth Annual, Pt. II; Water resources of Illinois, by Frank Leverett, in Seventeenth Annual, Pt. II; Water resources of Indiana and Ohio, by Frank Leverett, in Eighteenth Annual, Pt. IV; New developments in well boring and irrigation in eastern South Dakota, by NH Darton, in Eighteenth Annual, Pt.
Seite 68 - II; Preliminary report on artesian waters of a portion of the Dakotas, by NH Darton, in Seventeenth Annual, Pt. II: Water resources of Illinois, by Frank Leverett, in Seventeenth Annual, Pt. II: Water resources of Indiana and Ohio, by Frank Leverett.
Seite 19 - All of Nebraska west of the ninety-eighth meridian is underlain by the Pierre clay. Its surface outcrops are in the lower portion of the Niobrara Valley, the Republican Valley, and the extreme northwest corner of the State, but it is probable that careful search will reveal outcrops in the valley of the Platte River in the vicinity of the ninetysixth meridian. The formation is a thick mass of dark-gray or bluish clay or soft shale. Its thickness is probably at least 2,000 feet in the west-central...