Development of two Bohemian Forest glacial cirques based on their structural-geological conditions and morphology

Abstract

In the Bohemian Forest, moraines were dated demonstrating glaciation in the Late Glacial. Evidence of older glaciations, which authors of numerous studies assume to have occurred, is lacking. We suggest that the allometric development of the size and shape of glacial cirques may prove the occurrence of older glaciations. We conducted detailed field research at two glacial cirques. These cirques were classified as a slope cirque and a schrundline cirque according to their shape, with different degrees of development. Structural-geological conditions are essential for the shape and development of cirques. Considering the allometric development of cirques, the investigated cirques must have developed over a period of at least 300 ka and, thus, during more than one glacial cycle.