INDEX. 



451 



Page. 

 Contact metamorphism, notes by U. S. Grant on. 125-127 



Copper minerals, occurrence of. 113,184 



Copper-bearing rocks, age of 9^ 



chai-acter of _. 73-75 



relations of .- - - - 72, 73-<o 



CoutoMching, use of name. 159-160 



Coutchicliing group, equivalents of 91 



geologic place of — 1'* 



Cretaceous history of the district, sketch of 445-446 



Ci-etaceous period, erosion in -. -- 445-446,447 



Cross River, dike at — *32 



Cupriferous series. See Coppex'-bearing rocks. 



r). 



Denton, P. W., cited on mining methods in Ver- 

 milion district - -- 234,240-241 



Diabase dikes, intrusion of - ''^S 



Dikes, occurrence and character of, aplite 355 



basalt 24, 26, :»;,3T1-3T3. 42.2-424 



dolerite 200,205-208,308,400,40.5-406,422-424 



gabbro - 393-394,407,408-419 



granite 23,24-25,156,165-166, 



199, 22:^226, 246-274, 283-284, 305-341, a52-371 



granite-porphyry. _ -. 24^25,165-166 



greenstone - 155,200,2:23-226 



lamprophy re 306, 371-373 



quartz-porphyry. --- - 108 



Disappointment Lake, greenstone in contact with 



gabbro at 161 



metamorphosed conglomerate at - - - 31.5-316 



metamorphosed slates near -. -- 350 



Ogishke conglomerate at -.- 318-319 



Pewabic quartzite at 119 



Dolerite, Keweenawan, relations of 395 



Drainage system of the district, features of.. 19-20, 39-46i 



Drift, extent and character of - 425-430 



Duluth gabbro, age of - 24,26,33 



analyses of -- 405 



character of - 26,401^05 



dikes in -- 422-424 



distribution of - - 398-399 



exposures.of 397,399 



intrusion of , date and conditions of 443 



intrusive rocks in 422-424 



iron oxide bodies in 420-422 



metamorphism by 342-344, 393-394, 418-419 



nickel in.... 420-421 



petrographic characters of 401^105 



relations of, to adjacent formations. 24, 3:^, 408-408, 417 



to Cacaquabic granite 368, 369, 407 



to Ely greenstone 406 



to Giants Eange granite 3.57-358,407 



to Gunilint formation 389-390,407 



to Keweenawan series 407-408 



to Knife Lake slates 307-308 



to Logan sills 410-418 



to Lower Huronian sediments 407 



to Bove slates. 393,394,395,407 



to Snowbank granite 363-364,407 



to Upper Huronian sediments 407 



stratigraphic place of 33 



topography of 399-401 



Duluth and Iron Range Railroad, completion of 214 



location of 53 



metamorphosed rocks along 296, 340, 349 



Duluth, Port Arthur and Western Railroad, expos- 

 ures of Gunflint formation along 387, 388 



E. 



Page. 



Eagle Lake, Duluth gabbi'o at 402 



Eagle Nest lakes, glacial deposits at 428, 429 



Eames,H.H.,citationfrom,ongeology of thedistrict 67 

 on occurrence of iron ore at Vermilion 



Lake 213-214 



Eames, R. M., cited on geology of the district 67 



East Greenwood Lake, Cabotian rocks at 123 



Eby, J. H., cited on occurrence of copper minerals 



in hematite ore 184 



gi'aphite reported by 180 



Eby, J. H., and Berkey, C. P., cited on copper min- 

 erals and hematite ore 113 



Elftman, A. H., citation from, on Duluth gabbro. 401,415 



on geology of northeastern Minnesota 110-111 



on glacial history of Minnesota 426 



on ore deposits of Minnesota 113 



Elftman, A. H., Winchell, N. H., and Grant, U. S., 

 cited on geology of the Vermilion dis- 

 trict 117 



Ellipsoidal greenstones, deformation of 148 



Ellipsoidal structure in Ely greenstones, occur- 

 rence of 144-1.50 



plate showing 146 



Ely, amygdaloidal structure in rocks near 146,185 



dikes at and near... 199,200,360-661,373 



Giants Range granite near 354 



greenstone exposures near 165 



iron-ore deposits at 22-23 



location of 52-53 



Lower Hni'onian sediments at 299 



mining methods at -. 234,239-241 



ore bodies at 215 



ore outcrops at 243-244 



oresfrom, coarseness of 185 



panoramic view near... 216 



population of 20,52-.53 



Soiadan formation near 173 



Ely greenstone, age of aS, 197-198, 406 



amygdaloidal structure in 139-141 



character of 21,136-150,437 



colors of.. 1.36 



conglomerate in 138 



dikes in 155, .356 



distribution of.... 131-134 



economic value of 16:3-164 



ellipsoidal structure in 137, 144-150 



exposures of 134 



featm-esof 21,130-131 



formation of, dateof 4.37^38 



granite contacts with, effects of 165-157 



granite dikes in .3.56,360-361 



jasper areas in. 197 



jolntingin 137 



magnetite ore in. ,, 163 



mashing of. 137-1.38 



metamorphism of 21,155-163,169-172,418-419 



microscopic characters of 150-152 



naming of.. 130-131 



origin of 1.54-1.55,437-438 



original characters of 136 



petrographic characters of 1.36-150 



quartz veins in. 139 



relations of , at Jasper Lake 208-209 



at Moose Lake 206-207 



at Otter Track Lake 207-208 



to adjacent formations . 33, 161, 162-163, 191-199, 255- 

 256. 260, 268, 274, 281-283, 303-304, 356, 360-361, 406 



