[Footnote 92: For general discussions of Metamorphic Rocks, see A. Delesse, "Études sur le Métamorphisme des Roches" (1858); Lehmann, "Untersuchungen über die Entstehung der altkrystallinischen Schiefergesteine" (1884); A. Geikie, "Text-book of Geology" (1903), 764-807 and 728; Van Hise, "A Treatise on Metamorphism," U. S. Geol. Survey, Mon. 47 (1904); U. Grubenmann, "Die krystallinen Schiefer," ed. 2 (1909); A. Geikie and others, "The Geological Structure of the N. W. Highlands of Scotland," Mem. Geol. Surv. Scotland (1907).] [Footnote 93: D'Aubuisson de Voisins, "Traité de Geognosie" (1819), =1=, 298.] [Footnote 94: Darwin, ref. 50.] [Footnote 95: Teall, "Metamorphosis of Dolerite into Hornblende-Schist," Q. Journ. Geol. Soc., =41= (1885), 133.] [Footnote 96: T. G. Bonney, "The parent rock of the diamond in S. Africa," Geol. Mag. (1899), 309.] [Footnote 97: R. Lepsius, "Geologie von Deutschland," 2ter. Teil (1903), 146 and 169; H. Credner, "Die Genesis des sächsischen Granulitgebirges," Renuntiations-programm (1906).] [Footnote 98: Harker, "Igneous Rocks of Skye," Mem. Geol. Surv. Scotland (1904), 115.] [Footnote 99: Lévy, "Excursion à Aydat," Bull. Soc. géol. France (1883), 916; "Granite de Flamanville," Bull. Carte géol. France =5= (1893), 337.] [Footnote 100: F. D. Adams, "Haliburton and Bancroft areas," Mem. Geol. Surv. Canada, No. 6 (1910), 120.] [Footnote 101: G. A. J. Cole, "Metamorphic rocks in E. Tyrone and S. Donegal," Trans. R. I. Acad., =31= (1900), 453.] [Footnote 102: W. B. Wright and E. B. Bailey, "Geology of Colonsay," Mem. Geol. Surv. Scotland (1911), 28.] [Footnote 103: Judd, "Statical and dynamical metamorphism," Geol. Mag. (1889), 246.] [Footnote 104: Scrope, _op. cit._, ref. 63, p. 234.] [Footnote 105: Darwin, _op. cit._, ref. 78, chap. VII.] [Footnote 106: See especially J. Horne and E. Greenly, "Foliated Granites &c. in E. Sutherland," Q. Journ. Geol. Soc., =52= (1896), 633.] [Footnote 107: Lawson, "Geology of Rainy Lake Region," Ann. Rep. Geol. Surv. Canada for 1887 (1888).] [Footnote 108: Compare Chamberlin and Salisbury, "College Text-book of Geology" (1909), 428, and other works by these authors.] [Footnote 109: Sederholm, "Om granit och gneis i Fennoskandia" (with English summary), Bull. Comm. géol. Finlande, No. 23 (1907), and elsewhere.] TABLE OF STRATIGRAPHICAL SYSTEMS Quaternary Group Post-Pliocene and Recent Cainozoic Group Pliocene Miocene Oligocene Eocene Mesozoic Group Cretaceous Jurassic Triassic Palæozoic Group