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22000 years ago this whole area was covered by a thick layer of ice – as was most of Scotland and Ireland, all the way down to the North of England and Wales. The ice started melting 20,000 years ago but didn’t all disappear until about 11,500 years…

This is a channel that runs alongside the edge of the glacier, draining away any water that has melted. It can sometimes be seen after glaciation, and helps us to understand how big the glacier was at different times.