Bulletin of the United States Geological SurveyThe Survey., 1903 |
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Alaska amount anticline basin bed rock belt Bingham bituminous bodies breccias calcite Canyon carbonate Carboniferous Cartersville cement cent chalcocite chalcopyrite chert clay coal field contain copper country rock County Cretaceous deposits depth dikes diorite district east economic extends fault feet fissures folds formation fractures fuel fuller's earth geologic Glenn Creek gneiss gold gossan granite gravel gypsum Hill igneous rocks important inches intrusive iron lime limestone located lower marble mass material miles Mineral Resources U. S. mining Mountain northeast occur ocher outcrops oxide phosphate pits porphyry portion present probably pyrite quadrangle quartz quartzite region Rept River salt sand sandstones schists shaft shales siliceous silver slag slate slope southeast southwest sphalerite stone strata stream structure sulphides surface Survey thickness tion U. S. Geol upper Valley veins vicinity Yukon zinc zone
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Seite 91 - Reconnaissances in the Cape Nome and Norton Bay regions, Alaska, in 1900,
Seite 10 - 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 7 - Very respectfully, CW HAYES, Geologist in Charge of Geology. Hon. CHARLES D. WALCOTT, Director United States Geological Survey.
Seite 224 - ... further practice in handling these heavy slabs, this time will be reduced to 5 minutes. In all the above-mentioned cases the plates have been successfully rolled off without any hitch whatever. Raii-Roll».
Seite 92 - Wales, and hence very near the northwestern extremity of the continent. On Buhner Creek 2 to 3 feet of gravel overlies the bed rock, which consists of arenaceous schists, often graphitic, together with some graphitic slates. This is part of the schist series which has been described. The bed rock is much jointed, the schists being broken up into pencil-shaped fragments. They strike nearly at right angles to the course of the stream and offer natural riffles for the concentration of heavier material....
Seite 171 - It is built about and over the copper mines which support it as well as the neighboring city, Anaconda, 20 miles distant, where the chief industry is the reduction of the Butte ores. Four transcontinental railways run to Butte, and its traffic surpasses that of all the other cities of the State combined. To one approaching the city the general appearance is most desolate. Bare, brown slopes, burnt and forbidding, from which all vegetation was long ago driven by the fumes from the smelters, rise from...
Seite 371 - The geology of the road-building stones of Massachusetts, with some consideration of similar materials from other parts of the United States.
Seite 175 - In depth the lesser fractures are not tilled and are therefore less conspicuous. The veins of the district, both copper and silver veins, belong to three distinct systems. The oldest lodes have a general east-west course, the Parrot, Anaconda, and Syndicate lodes being examples. Another set of fractures has a northwest-southeast course, and has displaced the earlier veins. A still later set has a northeast course and has displaced both the earlier systems of veins. The first two systems are heavily...
Seite 363 - Shenandoah limestone in a series of folds represented in the folio as overturned to the west. The rock is generally a dark grayish shale, weathering into a yellowish or white clay, known locally as "soapstone.