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Add 50000 to 75000, and the sum, 120000 years, more nearly approximates the time that must have elapsed, since this rock was a river-bed.
As I stand on these hills, and look off into the valley of the Tioughnioga, about 2 1/2 miles wide, and at least 300 feet deep, and then take the insignificant stream now flowing along the valley bed, and note that it is only three [[strikethrough]] of [[/strikethrough]] or four miles to its head; and therefore must always have been comparatively small, my mind leaps back into the millions, since the water began to run along this channel towards the Carboniferous sea! Then these Portage Sandstones and Genesee Shales were were swept away to form Carboniferous Sandstone and Shales.