. The Vermilion iron-bearing district of Minnesota : with an atlas . themica-schists were , and when the basic greenstone was involvedthe amphibole-schists ^veve produced. T(i these rocks Winchell appliedthe name Coutchiching, using- it in tlie sense proposed by Lawson. In his Geol. and Nat. Hist. Survey of Minnesota, Fifteenth Ann. Eept., 1887, pp. 40-41. Geol. and Nat. Survey of iMinnesota, Fifteenth Ann. Kept., 18S7, pp. 172-178. Ueol. andNat. Hist. Survey of Jlinnosota, Final Kept., Vol. IV, 1899, p. 246. cQeol. and Nat. Hist. Survey of Minnesota, Final Kept., Vol. IV, 1899
. The Vermilion iron-bearing district of Minnesota : with an atlas . themica-schists were , and when the basic greenstone was involvedthe amphibole-schists ^veve produced. T(i these rocks Winchell appliedthe name Coutchiching, using- it in tlie sense proposed by Lawson. In his Geol. and Nat. Hist. Survey of Minnesota, Fifteenth Ann. Eept., 1887, pp. 40-41. Geol. and Nat. Survey of iMinnesota, Fifteenth Ann. Kept., 18S7, pp. 172-178. Ueol. andNat. Hist. Survey of Jlinnosota, Final Kept., Vol. IV, 1899, p. 246. cQeol. and Nat. Hist. Survey of Minnesota, Final Kept., Vol. IV, 1899, pp. 272, 273, and 283. Report on the geology of the Rainy Lake region: Geol. and Nat. Hist. Survey of Canada, 1889,F. pp. et seq. Geology of the Rainy Lake region: Am. Jour. Sci., .Sd series, Vol. XXXIII,1887. p. 477. ELY GREENSTONE. 159 general statement in the preface of the final volume of the Minnesota survey,Winchell abandoned the use of the term Coutchiching, for his studiesshowed that he could not in this district include any definite series there-. Fig. 2.—Reproduction of sketch by A. Winchell, showing the intricate relationship between the granite of Burntside Lake and the amphibole-schists. 160 THE VERMILION IRON-BEARING DISTRICT. under. The rocks that were first included under this term can be shownto l^e to a large extent formed by metamorphism from the Ely gi-een-stones as above described. The remaining portion has been formed bymetamorphism of sediments of Lower Huronian age, as described inChapter IV. Should Lawsons name Coutchiching be applied to theamphibole- and mica-schists lying between the granites of the district andthe rocks that have been intruded by the granite, we should have includedunder this term two series of rocks which, though possessing the sameschistose characters, are demonstrably of different age, both as regardstheir initial period of formation and their period of use of-the name Coutchiching is not wan-anted in c
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