Bulletin - United States Geological Survey, Ausgabe 225


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Seite 151 - Reconnaissances in the Cape Nome and Norton Bay regions, Alaska, in 1900,
Seite 13 - When all the folios are completed they will constitute a Geologic Atlas of the United States. A folio is designated by the name of the principal town or of a prominent natural feature within the quadrangle. It contains topographic, geologic, economic, and structural maps of the quadrangle, and occasionally other illustrations, together with a general description. Under the law, copies of each folio are sent to certain public libraries and educational institutions. The remainder are sold at 25 cents...
Seite 74 - Peering and Kiwalik are the chief distributing points for provisions and supplies, but during the past season steamers have landed parts of their cargoes intended for the more western camps at the mouth of Hex Creek, west of Decring.
Seite 152 - The gold and silver veins of Silver City, De Lamar, and other mining districts in Idaho. In Twentieth Ann. Rept., pt. 3, pp. 75-256.
Seite 443 - Selnia chalk. No investigations have yet been made concerning it, for the reason that there are comparatively few points where it appears in adequate thickness and in favorable localities as regards transportation. At Marshalls Landing, just above the mouth of Randons Creek, is the first exposure of the chimney rock along Alabama River.
Seite 451 - Underlying the cement-rock series is a very thick formation consisting of light-gray to light-blue massive-bedded limestone, with frequent beds of chert. These limestones are predominantly -highly magnesian, though occasionally beds of pure nonmagnesian limestone will be found in the series. The magnesian beds are, of course, valueless for Portland-cement manufacture, but the pure limestone beds furnish part of the limestone used in the Lehigh district for addition to the cement rock. An excellent...
Seite 54 - ... miles in length, supply the diggings on the Alder and the Bluestone. The high benches have been exploited with promising results in some instances, and a large ditch from the Kigluaik Mountains to provide hydraulic power for the whole region is projected.
Seite 435 - ... (3) The Selma chalk, which is of marine origin, and is composed, in part at least, of the microscopic shells of Foraminifera. This formation, throughout the western part of the belt covered by it in Alabama, is about 1,000 feet in thickness, and is made up of beds of chalky and more or less argillaceous limestone. In a general way it may be said that the lower and upper thirds of the formation contain 25 per cent...
Seite 435 - ... and upward of clayey matters mixed with the calcareous material, while the middle third will hold less than 25 per cent. of these clayey impurities. 4, the Ripley. This, like the preceding, is a marine formation, in which, generally, the calcareous constituents predominate, but in places it contains sandy and clayey beds. From this summary it will be seen that the Selma chalk is the...

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