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[215] Crosby. American Geologist, Vol. XII, 1893, pp. 368–375.
[216] Becker. Bull. U. S. Geol. Surv., Vol. X, pp. 41–75.
[217] Van Hise. Principles of North American Pre-Cambrian Geology. 16th Ann. Rept. U. S. Geol. Surv., Pt. I, pp. 668–672.
[218] Diller. Bull. Geol. Soc. Am., Vol. I, pp. 441–442. Ibid. Hay, Vol. III, pp. 50–55; and Newsom, ibid. Vol. XIV, pp. 227–268.
[219] Willis. Bull. Geol. Soc. of Am., Vol. XIII, pp. 331–336.
[220] McConnell. Canada Geol. and Nat. Hist. Surv., 1886, Pt. II.
[221] Geikie. Text-book of Geology.
[222] Becker. Geology of the Comstock Lode, Mono. III, U. S. Geol. Surv., Chapter IV.
[223] Reference, Van Hise. Sixteenth Ann. Rept. U. S. Geol. Surv., Pt. I, pp. 672–678.