Canada. W. G. Miller and C. W. Knight, "Revision of pre-Cam brian in Ontario," Journal, vol. 23 (1915) ; F. D. Adams, Problems of the Canadian Shield (1915) ; W. G. Miller and C. W. Knight, Pre Cambrian geology of south eastern Ontario, vol. 22 (1924) A. C. Coleman and W. A. Parks, Elementary Geology (1922) ; W. G. Miller, "Pre-Cambrian rocks of Canada" (Br. Ass. Ad. Sc., Toronto, 1924), Journal, pp. 32-33 ; G. A. Young, "Geology and economic minerals of Canada" (Geol. Sur. Can., 1926).
United States. M. G. Wilmarth, "Geologic Time Classification of the United States Geological Survey compared with other Classifications" (U.S. Geol. Sur., Bull. 769, 1925) ; C. K. Leith, "Lake Superior Pro Cambrian" (Bull. Geol. Soc. Am., vol. 38, Nos. I and 4, 1927).
British Isles. W. G. Miller, "A geological trip to Scotland; pre Cambrian of north-west Highlands compared with that of Ontario" (Ont. Dept. Mines; vol. 20, pt. I, pp. 259-269, 1911) ; A. Strahan, "Subdivisions and correlation of the pre-Cambrian rocks of the British Isles" (Int. Geol. Cong. XII., 19'3 ; Compte Rendu, pp. P. Lake and R. H. Rastall, Textbook of Geology (4th ed., 1927). Fennoscandia. J. J. Sederholm, "Pre-Cambrian Geology of Fenno
scandia, with special reference to Finland" (Bull. Geol. Soc. Am., vol. 38, Nos. I and 4, 1927).
S. Africa. F. R. C. Reed, Geology of the British Empire (1920 ; Alex. L. Du Toit, Geology of S. Africa (1926) ; A. W. Rogers, "Pre Cambrian rocks of the Union of S. Africa" (Bull. Geol. Soc. Am., vol. 38, Nos. I and 4, 1927).
India. F. R. C. Reed, Geology of the British Empire (1921) ; Sir T. Holland, "Pre-Cambrian rocks of India" (Br. Ass. Ad. Sc., Toronto, 1924) ; D. N. Wadia, Geology of India (1926).
W. Australia. A. G. Maitland and A. Montgomery, "Geology and Mineral Industry of W. Australia" (Bull. 89, Geol. Sur. W. Australia) ; F. R. C. Reed, Geology of the British Empire (1921).