Planation surfaces of the Urals and Appalachians (comparative analysis)

Abstract

Number, altitude and geomorphic position of .four topographic levels in Appalachians (Kittatinny, Schooley, Harrisburg and Parker-Strait) appeared to be completely identical to four topographic level described in the Urals. The two intermediate surfaces in the Appalachians (i. e. Schooley and Harrisburg) however considered to be Tertiary in age, whereas the corresponding surfaces at the Urals believed to be Mesozoic. The author argues for the age of the Harrisburg sirface to be Late Jurassic-Early Cretaceous, which is the same as that of the analogous Uralian surface. It suggests the other surfaces at the Appalachians could be synchronous to the Uralian ones.