OCR Text |
Show Atlantic Coast Plain Piedmont plain is a name used in the physiography of the United States to designate that part of the Atlantic coast plain which lies between the Appalachian highland and the low coastal plain proper. It Is distin guished from the latter topographically topographi-cally by being more rugged and eroded with deeper river valleys and geologically geo-logically by consisting of much older and harder rock strata. The change from the hard to the soft and recent formation is marked by a definite line of escarpments over which nearly all the Atlantic livers fall in rapids or cataracts, and I he line is known as the "Fall Line." The Piedmont plain is less defined In N;nv England than in the southern stales. It is narrowest and also approaches closest to the sea in New York n"d broadens southward, being about "on miles wide in North Carolina. |