The Grand Canyon Of Arizona: How To See It By George Wharton James

 -  As almost all this mass of deposition has
disappeared from the immediate Canyon region, we are compelled to believe
that - Page 133
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As Almost All This Mass Of Deposition Has Disappeared From The Immediate Canyon Region, We Are Compelled To Believe That

It has been swept away down the Colorado River to join the sands of the Carboniferous and later periods in

The Colorado Desert, the Salton Basin, the great low region of Lower California, and the Gulf itself.

Less by Erosion in the Canyon Region. Now figure out for a few moments the results of these different erosive periods. Eleven thousand five hundred feet of Algonkian gone; a small amount of erosion in the Cambrian epoch, the depth of which is unknown; and then the great denudation of the Eocene period sweeping away upwards of fifteen thousand feet of strata, give us a total of twenty-six thousand five hundred feet that have totally disappeared from the Canyon region. A vertical mile is five thousand two hundred and eighty feet. Mount Washington is about six thousand five hundred feet above the sea, - a trifle higher than Mount Lowe, near Pasadena, California. Take off from this six thousand five hundred feet, say one thousand five hundred feet, for the level of the country at the base of these two mountains, and then imagine a region five times as high as both of them, covering an area of country of possibly thirteen thousand to fifteen thousand square miles, slowly planed off by the erosive forces of nature.

Formation of River Beds. How was it done? I have spoken of the peaks and islets that first emerged from the Eocene Sea, and received the rains.

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