On the Superficial Accumulations and Surface-markings of North Wales

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Abstract
During several summers, while investigating the more solid geology of North Wales in connexion with the Geological Survey of Great Britain, my attention has been occasionally directed to the subject of the action of ancient glaciers in that country, which were first described by Dr. Buckland in 1841; and I have especially endeavoured to discover traces of a sequence of events characterizing the glacial epoch. On both sides of the Menai Straits, the low ground of Anglesea and Caernarvonshire is often covered by a coating of “drift,” composed of beds of sand, gravel, and occasionally of clay, mingled with boulders, and sometimes bearing marine shells characteristic of the period.

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