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[4] Ransome, Frederick Leslie, Copper deposits near Superior, Arizona: Bull. 540, U. S. Geol. Survey, 1914, pp. 152–153; The copper deposits of Ray and Miami, Arizona: Prof. Paper 115, U. S. Geol. Survey, 1919, p. 156; Discussion: Econ. Geol., vol. 8, 1913, p. 721.

[5] For more specific definitions of vertical zones of ore deposition in association with igneous rocks see Spurr, J. E., Theory of ore deposition: Econ. Geol., vol. 7, 1912, pp. 489–490; Lindgren, W., Mineral deposits, McGraw-Hill Book Co., 2d ed., 1919, Chapters XXIV-XXVI; and Emmons, W. H., The principles of economic geology, McGraw-Hill Book Co., 1918, Chapters VI-VIII.

An excellent discussion of a case of vertical and areal zoning of minerals is contained in Ore deposits of the Boulder batholith of Montana, by Paul Billingsley and J. A. Grimes, Bull. Am. Inst. Min. Engrs., vol. 58, 1918, pp. 284–368.

[6] Butler, B. S., Loughlin, G. F., Heikes, V. C., and others, The ore deposits of Utah: Prof. Paper 111, U. S. Geol. Survey, 1920, p. 201.

[7] Leith, C. K., and Mead, W. J., Metamorphic Geology, Pt. 2, Henry Holt and Company, New York, 1915.

[8] Butler, B. S., Loughlin, G. F., Heikes, V. C., and others, The ore deposits of Utah: Prof. Paper 111, U. S. Geol. Survey, 1920, pp. 152–158.

[9] Van Hise, C. R., and Leith, C. K., Geology of the Lake Superior region. Mon. 52, U. S. Geol. Survey, 1911, pp. 506–518; and references there given.

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