Rivers Since the Ice Age Under Fit Their Valley Flood Plains by Far Less Flow Than When Rainfall Several Times Greater


The valley walls of a floodplain of a river were not eroded back that far by occasionally huge floods but by constant flow during the Ice Age, so the rivers since then are said to be under-fit, for the river valleys which channeled the great flows of the rivers up until the Ice Age had ended circa 1400 b. c.