Origins
The present day channel is a result of glacial erosion of the bedrock along a line of weakness associated with the Menai Strait Fault System. During the series of Pleistocene glaciations a succession of ice-sheets moved from northeast to southwest across Anglesey and neighbouring Arfon scouring the underlying rock, the grain of which also runs in this direction. The result was a series of linear bedrock hollows across the region, the deepest of which was flooded by the sea as world ocean levels rose at the end of the last ice age.
Read more about this topic: Menai Strait
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