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Published online by Cambridge University Press: 14 March 2018
1 Min. Mag., 1924, vol. 20, p. 225.
2 Ibid., 1920, vol. 19, p. 19.
3 A Zawn in the St. Just area is a sheer steep-sided chasm in the cliffs formed by the walls of an outcropping mineral-vein, when the vein itself has disintegrated and fallen into the sea.