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In England, two lines of subterranean movement have long been known, by which the tertiary and secondary strata have been raised into anticlinal ridges and sunk into synclinal hollows. They both range east and west, or nearly so; one line, viz. from the Vale of Pewsey by Kingsclere, Farnbam, Guildford, and through the Weald of Sussex to Boulogne, is somewhat parallel to the vale of the Thames; the other, from Weymouth by the isle of Purbeck through the Isle of