INDEX. 



455 



Page. 



Keweenawan series, age of - 106 



Cabotian division of _ .- 12^124 



character of ._ 26-27,106 



components of-. 100,123-124 



dikes in — . 422-434 



distribution of 398-399 



Diiluth gabbro of 397-422 



equivalents of 118 



exposures of 297,299 



formations composing. 33 



gabbroof 124,397-422 



igneous roclis of 123 



intrusive roclisin 423-424 



iron oxide bodies in 420-423 



Logan sills of 397-422 



Manitou division of 124 



metamorpbism by 418-419,424 



origin of. 443-444 



petrographic characters of 401-406,433 



Potsdam rocks included in 132-123 



Puckwunge conglomerate of 133 



relations of, to adjacent formations 73-75, 406-416 



to Logan sills 410 



stratigraphic place of .- 89,99 



topography. 399-401 



Kloos, J. H., cited on geology of the district 69 



Kloos, J. H.. and Strong, A., cited on geology of the 



district 70 



Knife Lake, Agawa formation at 325 



Ely greenstone at 133,136 



jasper interbanded "with greenstone at 193 



Lower Huronian rocks at and near 23,297-303 



topography and geology at, relations of 433,434 



slates at and near 300,301 



Knife Lake slates, age of 33, 73, 284, 308, 406 



characters of 393-296,336-339,344-346 



dikes in.. 308,341 



dips and strikes of 280 



exposures of 295-296,347-353 



features of 24 



folding and faulting in 301 



granite contacts with 340-342 



metamorphism 301, 340-344, ,349-351, 445 



naming of .j 335 



origin of 441 



petrographic characters of 293-296, 336-339, 344-346 



stratigi'aphic position of _. 33 



pyritein . 294 



relations of, to Aga wa formation 303 



to Gunflint formation 388-389 



to Keweenawan rocks 307-.308 



to Ogishke conglomerate 281, .303 



to Snowbank granite 363 



strikes and dips of. 380 



thickness of 295,346-.347 



L. 



Lac Bois Blanc. See Basswood Lake. 



Lake Gobbemichigamma. See Gobbemichigamma 

 Lake. 



Lake Superior Basin, origin of 444 



Lake Superior region, pre-Cambrian history of . . 105-106 



Lake Vermillion. .S'ee Vermilion Lake. 



Lakes of the district, character of 41-43 



depths of 45-46 



origin of 4.3-46 



Page. 



Lakes, glacial, occurrence of 429-430 



Lauren tian rocks, characters and components of . . 76, 

 89,90-91,107,113-114 



Lawson, A. C, citation from, on Coutchiching 158-160 



on ellipsoidal structure of rocks of Lake of 



the Woods region 149 



ongi-aniteof Saganaga Lake 265,268-269,345 



on greenstones of Rainy Lake region 156 



on Lake Superior stratigraphy 99-100 



on Logan siUs 398,408,409^10 



Lee Hill, breccia at........ 178,230 



conglomerate at 287 



graphitic slatesnear 179 



greenstones and jaspers at 202-203 



Soudan formation at 173,175,201 



topography and geology at, relations of 431 



Leith, C. K., acknowledgments to 56 



citation from, on Biwabik formation. 378-379,390 



on dikes in Embarrass gi'anite. 357 



ongreenaUte 127,190 



on griiuerite 187 



on Gunflint and Lower Huronian rocks, re- 

 lations of 389 



on metamoi-phism of slates by gabbro in 



Mesabi range .394 



on Ogishke conglomerate and iron-bearing 



formation, relations of ,307 



on secondary minerals in schists 161 



on spherulitic structure in rocks of Mesabi 



district. _ 143 



work done by _ 17,30 



Literature of the district, resume of 56-128 



Little Saganaga Lake, gabbro at 402-403 



Logan, W. B., cited on Logan sills 398 



Logan sills, age of 33 



characters of 26,405-406,411-416 



distribution of 398-399 



exposures of 397-.398, .399 



intrusion of 443 



metamorphism by 418-419 



petrographic characters of 26, 405-406, 411-416 



relations of, to adjacent formations 123, 408-418 



section showing intercalation 01', in Rove slates. 400 



stratigraphic place of 33 



topography of 399-401 



Ijong Lake, amygdaloidal rocks at 146 



bre 



I at. 



dikes at 373 



gold-bearing quartz at 164 



granitic intrusions at 263 



greenstone exposures near 165 



spherulitic greenstones at 142 



Loon Lake, gabbro-slate contact at 394, 395 



Lower Huronian intrusive rocks, acid dikes of . . . .369-371 



character of 33-34 



distribution of ... . 34-35, 353-a54, 361, 365, 369-370, 371-372 



exposures of 354, 359-361, 364,,365,369,.373 



relations of 370-371 



topography of a54,.361,.3&5 



Lower Huronian sediments, age of 23, 308 



areas of 23,277-396 



characters of 24-25, 



284-295, .309-313, 327-328, 336-339, 344-346 



dikes cutting 306, .356-.3.57 



divisions of 2.3-24,33,27.5-276 



exposures of 278,298-299 



formations composing 23-24, .33, 275-276 



