Sandy soft-sediment clasts as diagnostic of hyperconcentrated flows

What is it about?

Hyperconcentrated flows were the common form of subglacial transport. Sandy (or gravelly-sandy) clasts embedded in massive gravel are good indicators of this specific environment. We consider the sandy clasts as diagnostic of hyperconcentrated flows. This is supported by other occurrences of large soft-sediment clasts in eskers of northern Poland.

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Why is it important?

Our study is aimed at a better understanding of waterlaid subglacial tunnel lithofacies and their associated hydrology, and sediment transport mechanism. Our study also aims at deepening insight into fluvial redeposition of soft-sediment clasts, a topic that still has unsolved sedimentological questions.