Abstract
PERMAFROST has been shown by many authors to have existed in various parts of England during the last glacial period1,2. Its full extent and distribution have remained somewhat uncertain but can be deduced from the occurrence of certain fossil ground structures. Ice-wedge polygons, the trough patterns of chalkland2, and the largest stone polygons and stripes are generally accepted as requiring permafrost. Less reliable features are involutions, and a deep layer of upturned stones above horizontally-bedded gravels. Preliminary results are reported here from mapping these structures using pit sections and air photographs.
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