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At St. Ludger, Upper Chaudiere Valley, in southern Qutbec, glacio-lacustrine sands of the Gayhurst formation which are older than 20 000 years B.P., are cut by a vertical till dike, 40 cm in width and more than 200 cm in height. The infilling materials are similar to those of the overlying Lennoxville till. The trend of the dike is at right angles to the(More)
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