The Falls of Niagara Their Evolution And Varying Relations to the Great Lakes
The Falls of Niagara Their Evolution And Varying Relations to the Great Lakes
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This form of section is represented at (a) figure 18 (page 105). On the other hand, if the width were 400 feat, about that of the river to-day, the depth should have been forty-five feet as shown at II R (figure 21).
In these calculations some errors rise from treating the mass of fallen boulders, having interstices filled with clay, as if com- posed of solid rock in its natural bedding. Allowing for this structure would leave a decrease of the fallen mass, and an increas3 in the size of the pr...e-glacial valley. On the other hand, with the removal of the clayey matter by the strong current of the river, much material from the thinner beds of limestone and sandstone would be carried away, and allowance here would decrease the arei of the pre-glacial gorge. However, whether the ancient channel were a little larger or a little smaller than here represented, the analysis shows that at this point a deep gorge did not exist. Accordinglv, this Ijuried, partly refilled canon, nearly 400 feet deep, was excavated by the modern falls when the river surface was somewhat lower than now.
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To quickly assess the difficulty of the text, read a short excerpt:
This form of section is represented at (a) figure 18 (page 105). On the other hand, if the width were 400 feat, about that of the river to-day, the depth should have been forty-five feet as shown at II R (figure 21).
In these calculations some errors rise from treating the mass of fallen boulders, having interstices filled with clay, as if com- posed of solid rock in its natural bedding. Allowing for this structure would leave a decrease of the fallen mass, and an increas3 in the size of the pr...e-glacial valley. On the other hand, with the removal of the clayey matter by the strong current of the river, much material from the thinner beds of limestone and sandstone would be carried away, and allowance here would decrease the arei of the pre-glacial gorge. However, whether the ancient channel were a little larger or a little smaller than here represented, the analysis shows that at this point a deep gorge did not exist. Accordinglv, this Ijuried, partly refilled canon, nearly 400 feet deep, was excavated by the modern falls when the river surface was somewhat lower than now.
What to read after The Falls of Niagara Their Evolution And Varying Relations to the Great Lakes?
You can find similar books in the "Read Also" column, or choose other free books by Geological Survey of Canada to read onlineMoreLess
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