Till breccia clasts deposited in periglacial conditions

What is it about?

The presence of the till/sand breccia, which is unique for Quaternary sediments, sheds new light on the depositional conditions in ice-marginal valleys. The till/sand breccia lithofacies can be considered to be a diagnostic criterion forfluvio-periglacial conditions in ice-marginal valleys.

Featured Image

Why is it important?

A till/sand breccia in records thermoerosion. The characteristic platy shape of the clasts results from the source material, which was a lodgement till with horizontal and vertical joints. We consider the till/sand breccia as diagnostic of ice-marginal valleys in a fluvio-periglacial environment, as it developed as an effect of thermoerosion of channel banks. Intensive thermoerosion processes is also a cause of unusual widths of Polish Lowland ice-marginal valleys (for example 10 km in study area).