Permafrost in England during the Last Glacial Period
Permafrost in England during the Last Glacial Period
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末次冰期期间英格兰的永久冻土
作者：
R. Williams
许多作者已经证明，在末次冰期期间，英国的许多地方都存在永久冻土层。它的全部范围和分布仍然有些不确定，但可以从某些化石地面结构的出现推断出来。冰楔多边形、白垩地的槽型2以及最大的石头多边形和条纹被普遍认为需要永久冻土。不太可靠的特征是对折，在水平层状砾石之上有一层很深的向上的石头。这里报告了利用坑剖面和航空照片绘制这些结构的初步结果。
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.