. The falls of Niagara . kea part of the journey this year; they will make anotherpart next year, and another the next, being constantlydisintegrated and pulverized. This work has been going on for many result is seen in the vast bar of unknown depthwhich is spread over the bottom of Lake Ontario aroundthe mouth of the river. On the inner side of the bar thewater is from sixty to eighty feet deep, on the bar it istwenty-five feet deep, and outside of it in the lake itreaches a depth of six hundred feet. And finally, to the force we have been considering,more than to any other, it
. The falls of Niagara . kea part of the journey this year; they will make anotherpart next year, and another the next, being constantlydisintegrated and pulverized. This work has been going on for many result is seen in the vast bar of unknown depthwhich is spread over the bottom of Lake Ontario aroundthe mouth of the river. On the inner side of the bar thewater is from sixty to eighty feet deep, on the bar it istwenty-five feet deep, and outside of it in the lake itreaches a depth of six hundred feet. And finally, to the force we have been considering,more than to any other, it is probable that all the cominggenerations of men will be indebted for a grand and per-pendicular Fall somewhere between its present locationand Lake St. Clair; for it must be remembered that thebottom of Lake Erie is only fourteen feet lower than thecrest of the present Fall, and the bottom of Lake St. Clairis sixty-two feet higher. It may also be considered thatthe corniferous limestone of the Onondaga group — which. Great Icicles under Lhe American Fall. opposite page 60. GEOLOGY. 6l succeeds the Niagara group as we approach Lake Erie —is more competent to maintain a perpendicular face thanis the Hmestone of the latter group. We may here appropriately notice a remarkable feat-ure in the geognosy of the earths surface from LakeHuron to the Gulf of St. Lawrence. We have beforestated that the elevation of that lake above tide-water isfive hundred and seventy-eight feet. But its depth,according to Dr. Houghton, is one thousand feet. Ifthis statement is correct, the bottom of it is four hundredand twenty-two feet below the sea-level. The elevationof Lake St. Clair is five hundred and seventy feet. Butits depth is only twenty feet, leaving its bottom five hun-dred and fifty feet above the sea-level. The elevation ofLake Erie is five hundred and sixty-eight feet. But it isonly eighty-four feet deep, making it four hundred andeighty-four feet above the sea-level. From Lake Erie
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