Relief of eastern foothills of the Byrranga Range (a case study of the Pronchishchev Lake northern coast, Taimyr)

Abstract

Five topographic levels have been identified in the region. Terraces 160-170 m, 135-150 m, and 120-130 m high are composed of glaciofluvial deposits of the Zyryanka glaciatio, terraces 105-115 and 95-105 m high are dated to the Sartan epoch. During the Zyryanka time the basin of the Pronchishchev. Lake formed it is glacial-tectonic in origin and has been essentially modeled by erosion. The valley network underwent considerable changes during the Sartan epoch; the Pronchishchev Lake still belonged to the drainage basin of the river of the same name, while the Kuldima River began to flow directly into the Laptev Sea. The Holocene moipholithogenesis proceeded at a very slow rate.