The British-Irish Ice Sheet (BIIS), a component of which was the Irish Sea Glacier, was an ice sheet during the Pleistocene Ice Age that, probably on more than one occasion, flowed southwards from its source areas in Scotland and Ireland and across the Isle of Man, Anglesey and Pembrokeshire. It probably reached its maximum extent during the Anglian Glaciation, and it was also extensive during the Late Devensian Glaciation (or Last Glacial Maximum).
The British-Irish Ice Sheet (BIIS), a component of which was the Irish Sea Glacier, was an ice sheet during the Pleistocene Ice Age that, probably on more than one occasion, flowed southwards from its source areas in Scotland and Ireland and across the Isle of Man, Anglesey and Pembrokeshire. It probably reached its maximum extent during the Anglian Glaciation, and it was also extensive during the Late Devensian Glaciation (or Last Glacial Maximum).
Source: Wikipedia "British-Irish Ice Sheet" · CC BY-SA 4.0
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