Ice Age in Nord America e il suo cuscinetto sull'antichità di man5edwith molte nuove mappe e illus., enland riscritto per incorporare i fatti che lo portano fino a data, con i capitoli sul lago Agassiz e la probabile causa di glaciazione . Nord America. ormai sepolto ad una profondità di 300 piedi per una distanza di manymiles. R. W. Ells richiama l attenzione anche alle numerose buriedchannels* in Eastern Townships, nella provincia di que-Bec, in prossimità del lago di Memphremagog. Questi sono, toa notevole misura, esplorato al momento attuale per thesake dell'oro in esse presenti. Questi non sono che un

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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 . NORTH AMERICA. now buried to a depth of 300 feet for a distance of manymiles. R. W. Ells calls attention, also, to the numerous buriedchannels* in the Eastern Townships, in the province of Que-bec, in the vicinity of Lake Memphremagog. These are, toa considerable extent, explored at the present time for thesake of the gold found in them. These are but a few of the innumerable facts indicatingthat before the great Ice Age not only the Ohio, but nearlyall the streams of the eastern United States, occupied deeperchannels than they now do. There were then probably noGreat Lakes, and few if any waterfalls, as there are now nolakes and waterfalls south of the glaciated region. All therivers had cut their channels down so low that they drainedto the bottom any lakes that may have once existed. * Annual Report of the Geological and Natural History Survey ofCanada, vol. ii, 1S66, p. 49, J. MAP SMUWING, in dotted LI^*ES. THE PREGI^Vtl.VI- l>«AIAi;i-: IN llIK llASIN OFTHE LOWER GREAT LAKIN.. PENNS Y LVANIA ?r^lSl^lj Cj.. toyr-t. CHAPTER XIII. DRAINAGE OF THE GLACIAL PEKIOD. During the continuance of the Ice age, an extraordinaryfactor was in the iield to modify tlie hnes of drainage, andto give to thetn both a direction and a character such as theynever had had at any other time. Throughout the wliole ex-tent of the Glacial period the ice itself was a most importantbarrier, deflecting the course of the streams, and, at the sametime, was a cause of irregularity in the volume of watersuch as is altogether unique in the history of the Morld. Thevast mass of frozen water then stored up at a high level wasan immense reservoir of force, ready, on proper conditions, to descend in torrents through any channel which was openedbefore it. As th

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• bookauthoruphamwarren18501934
• bookcentury1900
• bookdecade1910