The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . FiG. n.—Glacial scorings (after Agassiz). rial of the kames has been so much rolled by water that ifthe pebbles ever w-ere scratched, the marks have been this brief account of the physical characteristics ofice, and of the effects produced by its movement in a gla-cier, we are prepared to enter more understandingly upon asurvey of the actual
The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . FiG. n.—Glacial scorings (after Agassiz). rial of the kames has been so much rolled by water that ifthe pebbles ever w-ere scratched, the marks have been this brief account of the physical characteristics ofice, and of the effects produced by its movement in a gla-cier, we are prepared to enter more understandingly upon asurvey of the actual facts relating to the past and presentextent of the ice-fields over the northern part of NorthAmerica. Keserving the discussion of theories concerningtlie cause and date of the glacial period to the latter part, ofthe treatise, we will first consider the facts concerning theglaciers still existing in America, and then briefly, by way ofcomparison, those concerning glaciers in other portions ofthe world; after which we will present in considerabledetail the more recent discoveries concerning the extensionand work of the great American ice-sheet during the so-called Glacial ?a a -1 7} a gM o -a 3On hO a oo ao a 73 CHAPTER II. GLACIERS ON THE PACIFIC COAST. Notwithstanding the great height of the Rocky Moun-tains, they are, in the southern part, devoid of living lack is doubtless caused by the dryness of the atmos-phere, the winds from the Pacific having already, beforereaching the interior, yielded their moisture to the solicita-tions of the lofty peaks of the Sierra Nevada and the CascadeRange. Still, a few small glaciers are found among the sum-mits of the Wind River Mountains of Wyoming, and near thesources of Flathead River in Montana. Farther north, how-ever, near the Canadian boundary, glaciers begin to appearin increasing number and size. The broad picturesque sum-mits of the Rocky Mountains forming the continental dividebetween the head-waters of
Size: 1200px × 2083px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthoruphamwarren18501934, bookcentury1900, bookdecade1910
