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abundant Alaska andesite angles appear augite basalts base beds belt body brown carry character claim closely Coast color Cone considerable consists contain copper Crater Lake Creek crest crystals dacite deposits described developed dikes district east evidence exposed extends extinction feet feldspar flow fragments geology Glacier glass gold grains granite gravel greenstone groundmass head hornblende hypersthene inches included intrusive Island Ketchikan lava less limestone Llao Rock localities located lower magnetite mass material microlites miles mineralized mining Mount Mazama Mountain nearly noted observed occur parallel Peak phenocrysts plagioclase plain Pleistocene portion present probably pumice pyrite quartz Range region reported River rock schist seen side similar slope southern specimens strike structure surface Survey thickness thin section upper usually valley values vein width writer zone
Page 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.
Page 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
Page 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,
Page 3 - 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
Page 120 - DC LIBRARY CATALOGUE SLIPS. [Take this leaf out and paste the separated titles upon three of your
Page 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
Page 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.
Page 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.