collapsed ice-walled lakebed

collapsed ice-walled lakebed
   A lakebed that formed in a lake bounded by stagnant ice, but floored by solid ground, usually till. Collapse features are limited to the lakebed margins. Presently, these materials and sedimentary structures generally occur as roughly circular-shaped hills of till capped by lacustrine sediments, generally at elevations higher than surrounding disintegration moraine.
   SW & CF

Glossary of landform and geologic terms. 2013.

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  • collapsed ice-floored lakebed —    A lakebed formed in a lake on glacial ice and subsequently let down or collapsed by the melting of underlying ice, resulting in contortion or folding of the lacustrine sediment and sedimentary structures. These modified or distorted lacustrine …   Glossary of landform and geologic terms

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