Transactions . K. Leith, MonographXLIII, U. S. Geological Survey (1903). The Vermilion Iron-Bearing District of Minnesota, by J. M. Clements, Mono-graph XLV., U. S. Geological Survey (1903). The Menominee Iron-Bearing District of Michigan, by W. S. Bayley, Mono-graph XLVL, U. S. Geological Survey (1904). See also: Correlation Papers—Archean and Algonkian, by C. R. Van Hise, Bulletin , U. S. Geological Survey (1892). The Iron-Ore Deposits of the Lake Superior Region, by C. R. Van Hise, 21s*Annual Report, TJ. S. Geological Survey, Pt. III., pp. 305-434. Principles of North American Pre-Camb
Transactions . K. Leith, MonographXLIII, U. S. Geological Survey (1903). The Vermilion Iron-Bearing District of Minnesota, by J. M. Clements, Mono-graph XLV., U. S. Geological Survey (1903). The Menominee Iron-Bearing District of Michigan, by W. S. Bayley, Mono-graph XLVL, U. S. Geological Survey (1904). See also: Correlation Papers—Archean and Algonkian, by C. R. Van Hise, Bulletin , U. S. Geological Survey (1892). The Iron-Ore Deposits of the Lake Superior Region, by C. R. Van Hise, 21s*Annual Report, TJ. S. Geological Survey, Pt. III., pp. 305-434. Principles of North American Pre-Cambrian Geology, by C. R. Van Hise, lQthAnnual Report, U. S. Geological Survey, Pt. L, pp. 571-874. 2 The Michipicoten Iron-Ranges, by A. P. Coleman and A. B. Willmott: Geo-logical Series, University of Toronto Studies, pp. 39-151 (1902). See also Report of the Bureau of Mines, Ontario, 1902, pp. See Reports of Ontario and Canadian Geological Surveys. 104 GEOLOGY OF LAKE SUPERIOR IRON-BEARING This sketch-map of the geology of the Lake Superior region is generalized andmodified from a general geological map of the Lake Superior region, on a scaleof ten inches to the mile, compiled by C. R Van Hise and C. K. Leith for publi-cation in a final general monograph on Lake Superior geology in preparation forthe U. S. Geological Survey. GEOLOGY OF LAKE SUPERIOR IRON-BEARING SERIES. 105 The ore-bearing districts themselves, comprising but a smallportion of the Lake Superior region as a whole, are the areasin which the fullest successions of pre-Cambrian rocks are ex-posed ; the intervening areas are less well-known. It has beenpossible to correlate, with reasonable certainty, the major units, although the geology of each of the districts hasbeen worked out in large part independently; but because ofthe considerable, less well-known areas separating the closelystudied districts, it is difficult at the present time completely tounify the geology of the region
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