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The sediments of the past are many miles in collective thickness: yet the feeble silt of the rivers built them all from base to summit. - John Joly The sediments of the past are many miles in collective thickness: yet the feeble silt of the rivers built them all from base to summit. - John Joly The sediments of the past are many miles in collective thickness: yet the feeble silt of the rivers built them all from base to summit. - John Joly