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Show ban to the soft anil recent formation Is marked by n definite line of oscarp-meils oscarp-meils over which nearly all the Atlantic At-lantic rivers fall in rapids or cataracts, and the line Is known us Ihe "fall line." Tin; I'leihnoiit plain Is less tie-lined tie-lined In New England than In the soulhern slates. If Is narrowest und also approaches closest lo Ihe sea in New York and broadens southward, being about ,'itX) miles wide In North Carolina. Geographic Division "I'leilmoiil Plain" Is a name used In the physiography of the United Slates to designate that part, of the Atlantic COiisr plain which lies between the Appalachian Ap-palachian highland and the low coastal coast-al plain proper. It Is distinguished from Ihe Inller topographically by being be-ing more rugged anil eroded with deer er river valleys and geologically by consisting of much older and harder hard-er reek "Irutu. The change from tho |