Guide books of excursions in Canada1-10 . les (8 km.) farther on, the railwayswings close to the river at a point near thehead of Miles caynon, and from there a splendidview is afforded of the canyon with its walls ofTertiary basalt showing pronounced verticalcolumnar jointing. During Pleistocene time, the former channelof Lewes river became filled with glacial debris,causing the stream to become diverted from itsfoimer course. After the retreat of the ice, theriver had become superimposed on the basalts inthe valley and, in rapidly sinking its channelto obtain grade, produced the famous Miles
Guide books of excursions in Canada1-10 . les (8 km.) farther on, the railwayswings close to the river at a point near thehead of Miles caynon, and from there a splendidview is afforded of the canyon with its walls ofTertiary basalt showing pronounced verticalcolumnar jointing. During Pleistocene time, the former channelof Lewes river became filled with glacial debris,causing the stream to become diverted from itsfoimer course. After the retreat of the ice, theriver had become superimposed on the basalts inthe valley and, in rapidly sinking its channelto obtain grade, produced the famous Milescanyon. In shooting this canyon and theWhitehorse rapids below, many men have losttheir lives, particularly during the early daysof the Klondike excitement and before theconstruction of the railway. From the head of the canyon, the railway descends with a steep grade to the town of Whitehorse which is situated at the head of no m. navigation on Lewes river, the main tributary 176 km. of the Yukon. Whitehorse—Altitude 2,083 ft. (633 m.). 7i WHITEHORSE COPPER BELT.* General Description. The Whitehorse copper belt is situated in the southernpart of Yukon Territory, about 45 miles (72 km.) northof the British Columbia boundary, and extends along thewestern side of the valley of Lewes river—the principalfeeder of the Yukon—for a distance of about 12 miles(19-2 km.) Most of the important mining propertiesare situated at distances of from 4 to 7 miles (6-4 to 11 -2km.) from the present terminus of the White Pass andYukon railway at Whitehorse. The oldest rocks known in the district are limestonesreferred to the Carboniferous. These have been exten-sively invaded by Mesozoic andesites and also by plutonicrocks ranging in composition from typical hornblendegranites to gabbros. The youngest consolidated rocksin the district are basalts of Tertiary age. All are overlainby Pleistocene and Recent deposits. The ore-depositsare of contact-metamorphic origin and occur dominantlyin the li
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeology, bookyear1913
