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Most evidence of ice is for the last glaciation as it obliterated the evidence of previous glaciations.

Most of Britain was covered in ice although it stopped to the north of London. The evidence is found in the large areas of glacial till, (loose sediment with lots of different sizes and types of stones without any sorting into layers), striations on smooth outcrops of rock caused by ice grinding over it and erratics, (boulders from other parts of the country left isolated in areas where they would not normally be found). Also "U" shaped valleys carved by glaciers and ice-dammed lakes now only shown by former shorelines along valleys.

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