Menai Strait - Origins

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.

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