Planation surfaces of South America

Abstract

The age of planation surfaces within South America has been revised. Dominant surface which cuts Pre-Cambrian and Lower Paleolithic rocks (L. King considers the surface to be Sul-American) is proved to be Mesozoic Post-Gondwanian one. Sul-American and younger surfaces are developed mostly on Mesozoic and Cenozoic rocks, but more widely within the limits of the Andes zone. Tectonic uplift amplitudes are defined by measurements of planation surfaces distortions, shown at the applied map with isobases.