For over fifty years, the writer’s chief avocation has been the study of the evolution, history, and significance of man. Modern estimates of the antiquity of man depend on the determination of the age of deposits that contain human bones or artifacts. Thus, determination of the ages of the supposed oldest human remains—those of Trinil, Java, and the Piltdown man of England—involve estimates of the rate of valley-lowering at the points in question. The writer’s studies over many years have pointed toward two conclusions: first, the great antiquity of the earth, in general; second, and, with increasing conviction, the recency of present physiographic features. The present studies deal with the rate of erosion and other factors affecting surface sculpturing, and, if sustained by subsequent studies, may materially affect estimates of the antiquity of man.


The Appalachian region, consisting of mountains, plateaus, . . .

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