452 



INDEX. 



Bly greenstone, relations of, to Dulutli gabbro .. 161, 



to Giants Range granite- 356, 



to iron-bearing formation - 



to Lower Huronian sediments 281-283, 303-304 



to Saganaga granite 268, 27i 



to Soudan formation 191-199 



to Trout, Bumtside, and Basswood lakes 



granites -^ 



to Vermilion Lake granite 255-256 



schistose forms of - - 153-154 



Soudan formation infolded in, figure show 



ing 205 



spherulitic and ellipsoidal structure in 141-144, 



146-148,167-168 



sti'atigi'apMc position of --- 33 



structure of 135-136 



textures of -:.. 137,151-152 



topography of 134^135 



tuffs associated with. - 138,166 



volcanic character of 166-169 



Ely Island, conglomerate at 279,288,291 



geologic map of east end of 282 



graywackeat -. -- 288-291 



Knife Lake slates at -- 295 



porphyry at.. 251-252,288-291 



Emerald Lake, brecciated rocks at 178 



folding of Soudan formation at 210-211 



iron-bearing formation at, relations of 210 



jasper inter banded with greenstone at 193 



slates at 336 



Soudan formation at.. 210-211 



Ensign Lake, conglom'erate at 319 



slates at - 336 



Epsilon Lake, argillites at 86 



Exploration of the district, history of 56-63 



F. 



Pall Lake, greenstones at and near 118,132 



jasper folded at. 176 



jasper interbanded with greenstone at 192 



Soudan formation at 173 



Farm Lake, metamorphosed rocks at. 340 



Pay Lake, Gunflint formation at 288 



Feldspar of Cacaquabic granite, analysis of 366 



Pinlay, J. R., and Smyth, H. L., citation from, on 



age of slates of Vermilion district 281 



on conglomerates of Vermilion Lake 252 



on geology of the Vermilion range 111-112 



on iron ores, origin of 232 



on jasper mass at Soudan Hill 230 



on Ogishke conglomerates, origin of 286 



on schist at Lee mine, origin of 223 



flgui'e cited from. 231 



Pish of the district, kinds of 50-52 



Flask Lake, cleavage at 302 



gray wackes at 337 



greenstone, porphyritic, near 348-349 



Ogishke conglomerate near '. 317-318 



Forests in the district, area and character of 20, 47-50 



Fox Lake, graywackes and slates interbedded and 



faulted at 301 



Fraser Lake, Pewabic quartzite at 119 



&. 



Gabbro, metamoi-phism by 161-162, 342-344 



Gabbro plateau of northeastern Minnesota, topo- 



gi-aphic features of.. 37-38 



GabimichigamaLake. See GobbemichigammaLake. 



Game of the district, kinds of 50-52 



Garden Lake, Soudan formation at 173 



Geikie, Archibald, citation from, on ellipsoidal 

 structure in volcanic rocks of Great 



Britain 144-145,150 



Geographic location of the district 32-33 



Geologic history of the district, sketch of 437-447 



Geologic structure, relations of, to topography... 431-436 



Giants Range, Animikie rocks in 93 



area north and northwest of, topography of 36-37 



course and general features of 35-36 



glacial deposits near 426-428,429 



origin of 444 



relations of topography and geology at 431-436 



•See also Mesabi range. 



Giants Range granite, age of 358,406 



aplite dikes in 355 



conglomerate in contact with 305-306 



dikes in 355 



distribution of 353-354 



exposuresof 354 



folding in 358-359 



intrusion of, date of 441 



in the Ely greenstones 165-166 



Knife Lake slates in contact with 340-342 



granite, metamorphic action of 24,359 



petrographic characters of 354-356 



relation of , to adjacent formations 356-358 



to Duluth gabbro 407 



to Ely greenstone 356,359,360-361 



toKeweenawan gabbro 357-358 



to Lower Huronian sediments 356-1^57 



to sedimentary rocks , 283 



to Soudan formation 356,359 



schists in contact with 171 



topography of 354 



Glacial drift, extent and character of 425-430 



Glacial lakes, occurrence of 127,429-430 



Glaciation in the district 27, i^ 



Gobbemichigamma Lake, Animikie series at 88 



conglomerate-greenstone contact at 304 



depth of-. 46 



dike cutting gabbro at 422 



Duluth gabbro at 398 



folding at 306-307 



gabbro-slate contact at 351-352 



greenstones at 18.133,136 



greenstone-gabbro contact at 161 



Gunflint rocks near 383 



iron-bearing formation near 383 



Logan sills at 398 



Lower Huronian sediments at 298, 301 



metamorphosed slates at 343 



Pewabic quartzites at 119 



Upper and Lower Huronian at, relations of 306 



slatesat --- 343,351-353 



topography and geology at 433 



unconformity at 307 



Gold, reported occurrence of 213 



Gold mining, early attempts at, in Vermilion dis- 

 trict 213 



Gold-bearing rocks, Vermilion Lake, occurrence of. 69 



Graff, C. P., acknowledgments to. 31 



Grand Portage, rocks at 122 



Granite, age of.. 90,246-24' 



character of 23, 107-108, 124, 246-250, 258-265, 266 -267 



dikes of 26.5-256 



