The guardians of the Columbia, Mount Hood, Mount Adams and Mount St Helens . THE MOUNTAINS 87. Ice Cave in lava beds near Trout Lake. see abundant evidence of the glacialorigin of the Sandy and Zigzag can-yons. The White River Canyon hasbeen thoroughly explored and de-scribed by Prof. Reid. All three of these wide U-shapedcanyons were once occupied by greatglaciers, which left their record in thescorings upon the sides of the gorges;in the mesas of finely ground morainewhich they spread over the bottomsand through which the modern rivershave cut deep ravines; in trees brokenand buried by the g
The guardians of the Columbia, Mount Hood, Mount Adams and Mount St Helens . THE MOUNTAINS 87. Ice Cave in lava beds near Trout Lake. see abundant evidence of the glacialorigin of the Sandy and Zigzag can-yons. The White River Canyon hasbeen thoroughly explored and de-scribed by Prof. Reid. All three of these wide U-shapedcanyons were once occupied by greatglaciers, which left their record in thescorings upon the sides of the gorges;in the mesas of finely ground morainewhich they spread over the bottomsand through which the modern rivershave cut deep ravines; in trees brokenand buried by the glaciers in this drift;in the fossil ice lying beneath it, andin huge angular boulders left stand-ing on the valley floors, several milesfrom the mountain. Sandy glacier extends three hun-dred feet farther down the slope thando the north-side glaciers, but theZigzag and White River glaciers, flowing out of the crater, end a thousand feethigher. This is due not only to the smaller reservoirs which feed them andto their southern exposure, but also doubtless to the easier grade, which holdsthe
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Keywords: ., bookcentury1900, bookdecade1910, bookidguardiansofc, bookyear1912
