A layer of ice covering an extensive tract of land for a long period of time.
- Several scientists have proposed that the southern part of the Greenland ice sheet disappeared during the period of maximum interglacial warmth.
- Younger cited evidence for extensive ground freezing in SE England during the Devensian, beyond the limit of the Devensian ice sheet.
- Later, as the permafrost melted and the ice sheet warmed as a result of climatic amelioration, the ice would have become wetbased.
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