A transitive topography between erogenous and plain-platform areas

Abstract

Two possible concepts about transition relief are suggested for the discussion: a) the relief reflects the appearance of the first signs of erogenous processes on the Earth's surface and indicates the increase of the process intensity up to the degree characteristic of the peripheral parts of mountain regions; b) relief is a complex which combines simultaneously features of erogenous and plain-platform regions. In accordance with the first concept the preorogenic zones of transitive relief are distinguished, in accordance with the second one the transition morphostructural zones are distinguished, two overlapped groups of morphostructures being formed within these zones. The forms of the first group follow ancient structures, which is typical for platform plains, morphostructures of the second are formed under the influence of geological structures of the same age of the neighbouring orogenic regions.