. The Niagara book : a complete souvenir of Niagara Falls : containing sketches, stories and essays--descriptive, humorous, historical and scientific. hrough some of the lowplaces on their southern boundary ; next it must havefilled their basins with ice, and deepened the sheetuntil its surface lay thousands of feet above theirfloor. We cannot trace the history of these alterationswhich the advance of the glacial envelope broughtupon this field of land and water. But the steps inthe alterations may be inferred from what happenedwhen the envelope retreated stage by stage until itvanished from t
. The Niagara book : a complete souvenir of Niagara Falls : containing sketches, stories and essays--descriptive, humorous, historical and scientific. hrough some of the lowplaces on their southern boundary ; next it must havefilled their basins with ice, and deepened the sheetuntil its surface lay thousands of feet above theirfloor. We cannot trace the history of these alterationswhich the advance of the glacial envelope broughtupon this field of land and water. But the steps inthe alterations may be inferred from what happenedwhen the envelope retreated stage by stage until itvanished from the continent, or at least from the partof the field with which we are concerned. For a timethe barrier lay in such a position that the waters of theLakes below Superior were barred out from the passageof Niagara, flowing over into the valley of the Ohiothrough a channel passing by the site of the City ofFort Wayne, and thence into the Wabash old waterway has been preserved with unmistak-able clearness. With the further retreat of the ice-front to the northeastward, the Hne of the barrier waswithdrawn to near the present mouth of Lake. 78 THE GEOLOGY OF NIAGARA FALLS. Ontario, where it flows into the St. Lawrence this time the level of the Great Lakes was loweredby successive stages, though on the whole rather sud-denly, to the amount of five hundred and fifty feet. With the last mentioned condition of the ice bar-rier the exit of the Great Lakes changed to a pathwhich led through Central New York, down the valleyof the Mohawk River. The channel still shows themarks of the great tide of water, probably as great inits volume as that which now passes Niagara who journey by the New York Central Railwayto and from Albany, may note at Little Falls the broadgorge of the sometime great river which is now occu-pied by a relatively small stream. It might be sup-posed that at this stage the observer would havefound the Niagara river flowing in somewhere nea
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectadambiblicalfigure
