Professional Paper - United States Geological Survey, Випуски 1 – 3The Survey, 1902 |
Загальні терміни та фрази
abundant andesite appears argillites augite augite microlites basalts bed rock belt Cascade Range chiefly chloritic claim Coast Range color Cone contain copper pyrite country rock Crater Lake crest crystalline limestone crystals dacite deposits developed Devonian dikes diorite east exposed extinction angles feet feldspar flow geology glacial Glacier glass inclusions gold grains granite gravel Gravina greenstone greenstone-schist groundmass holocrystalline hornblende hyalopilitic hypersthene inches inclosures Inlet intrusive iron pyrite Kasaan Ketchikan Ketchikan district Ketchikan series Kugruk Kuzitrin laths lava limestone Llao Rock magnetite mass Mesozoic miles mineralized zone Mount Mazama Mountain occur olivine Paleozoic parallel Peak Peninsula phenocrysts plagioclase Port Clarence Prince of Wales prisms probably pumice quartz quartz veins region River schist schistose seen shear slope southeastern Alaska southern specimens spherulites surface thickness thin section tunnel U. S. Geol Vallenar volcanic Wales Island width writer
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Сторінка 5 - 'bounded north by the parallel forty-three degrees four minutes north latitude, south by forty-two degrees forty-eight minutes north latitude, east by the meridian one hundred and twenty-two degrees west longitude, and west by the meridian one hundred and twenty-two degrees sixteen minutes west longitude, having an area of two hundred and forty-nine square miles.
Сторінка 34 - A certain proportion of the ice, however, during the maximum phase of this great glacier flowed through passes in the Coast Ranges, and uniting there with ice derived from the western slopes of these ranges, filled the great valley between Vancouver Island and the mainland, impinged upon the shores of the Queen Charlotte Islands, and still
Сторінка 6 - a good opportunity to observe some of the most important features of this great pile of lavas. The Cascade Range in southern Oregon is a broad irregular platform, terminating rather abruptly in places,
Сторінка 9 - ranging from over 500 to nearly 2,000 feet in height, encircling a deep, blue sheet of placid water in which the mirrored walls vie with the
Сторінка 120 - DC LIBRARY CATALOGUE SLIPS. [Take this leaf out and paste the separated titles upon three of your
Сторінка 14 - the region under discussion and will not be further considered. The so-called Coast Range extends from near the boundary of Washington northward through British Columbia into southeastern Alaska. In British Columbia it has a width of about 100 miles, which decreases to the northward. Its peaks vary in altitude from 7,000 to 8,000 feet. Following the
Сторінка 28 - the same region consists essentially of quartz and orthoclase phenocrysts in a groundmass of quartz and feldspar, with muscovite, largely secondary, and a secondary growth of feldspar surrounding the larger orthoclase phenocrysts.
Сторінка 7 - detritus filling the valleys. Across these plains Anna Creek and Rogue River have carved deep, narrow canyons with finely sculptured walls, which the roads follow for some distance.
Сторінка 14 - The Coast Range, the St. Elias Range, and the Aleutian Range lie adjacent to the coast, while the Alaskan Range is inland and forms the northern boundary of the system. The