[454-A] See map of Europe and explanation, in Principles, book i.
[456-A] Elie de Beaumont, sur les Montagnes de l'Oisans, &c. Mém. de la Soc. d'Hist. Nat. de Paris, tom. v.
[456-B] See Murchison, Geol. Trans., 2d series, vol. ii. part ii. pp. 311-321.
[456-C] Western Islands, vol. i. p. 330. plate 18., figs. 3, 4.
[456-D] Von Buch, Annales de Chimie, &c.
[457-A] Proceedings of Geol. Soc., vol. ii. p. 562.
[457-B] See the Gæa Norvegica and other works of Keilhau, with whom I examined this country.
[459-A] Murchison, Geol. Trans., 2d series, vol. ii. p. 307.
[459-B] Geognostische Wanderungen, Leipzig, 1838.
[461-A] In the above section I have attempted to represent the new discoveries made since 1839, by Mr. Necker and Mr. A. C. Ramsay, in regard to the plutonic formations, 6. a, and 6. b.