450 



INDEX. 



Beaver Bay diatase, occurrence of 123-124 



Bebb, E. C, work done by 17 



Bell, Bobert, cited on geology of the district 69 



Berkey, C. P., cited on copper minerals of Minne- 

 sota... — - 113.184 



Big Eock Lake, iron formation at, relations of 210 



jasper interbanded with greenstone at 193 



Bigsby, John J., geologic work in Lake Superior re- 

 gion done by - "* 



Bingoshick Lake, Logan sills at 398 



BirchLake. Agawa formation at 32o 



Pewabic quartzite near H^ 



slates at.. 336,347 



Birch Point, glacial deposits at - - - - *-8 



Birge E. A., cited on plankton of lakes of the dis- 

 trict — -; f 



Biwabik formation, chai'acter of. 377-3^9 



equivalent of 25,377-379 



thickness of - ---- ^^ 



See also Pewabic. 



Black Eiver schists, equivalent of 92 



Bois Blanc. See Basswood. 



Bone Lake, Michigan, crystalline schists at 168 



Brecciation, examples of 194-19o 



Brule Lake, Duluth gabbro at 408 



Burned areas, locations of 48,49 



Burnt Forties, banded rocks in 1^8 



granite porphyry in 2o7 



location of ^8 



BurntsideLake, dikes at 262-263 



glacial depositsat *28 



gi'anite at, age of p^l 



distribution of - 258 



foldingin - - -_ ^62 



petrographic characters of 259-260 



relations of 260-261 



granites and schist at, figures showing rela- 

 tions of 158,159 



metamorphosed greenstones at .' 194 



view at -- --- 392 



C. 



■Cabotian division of Keweenawan rocks, character 



andextentof 123 



Cacaquabic granite, age of 369,406 



analysisof 36i 



augiteof, analysisof .- 366 



character of 25,365-368 



contact of Ogishke conglomerate with 305-306 



distribution of --- 36o 



exposm-es of --- - 369 



feldspar of, analysisof ---- 366 



intrusion of, date of 441 



metamorphism of slates by - 341 



occurrence of.. -- ...24,25,364 



petrographic characters of 365-368 



relations of, to adjacent formations 24, 368 



to Duluth gabbro 407 



topographyof -- -- 365 



Cacaquabic granite-porphyry, analysis of 367 



Cacaquabic Lake, geology of region near 108-109 



granite at.. -- 364-369 



green schist near.. -- - 85 



greenstone near, structure of 136 



Lower Huronian slates at 301 



Ogishke conglomerate at 319 



syenite at - ^1 



Page. 

 Cache Bay, Saganaga Lake, granite cutting green- 

 stone at 274 



gi'eenstone in contact with contact at 311 



Ogishke conglomerate at 274,309,311 



Cambrian period, erosion in 445,447 



erogenic movements in 445 



Canada, Ely greenstone in 132 



Canoe Island, Knife Lake slates at 295 



Carbonates, iron-bearing, analyses of. 380 



Carp Lake, Agawa formation at 325,332 



graywackeat 347 



slates at 3.36 



Cashaway River. See Kawishiwi. 

 Carver, Jonathan, cited on route from Grand Por- 

 tage to Rainy Lake 57 



Chandler mine, drift of, view showing.. 238 



mining methods at 234,239-241 



ore of 22,183-185,217-222,241 



sections across 216,217,218,219 



shaft of, view showing 216 



Chatard, T. M., analyses of iron-bearing cai'bon- 



atesby 380 



Chauvenet, W. M., citation from, on Duluth gabbro. 403 

 on iron-bearing rocks of gunflint foi-mation. 385 



on iron oxide bodies in Dviluth gabbro 420 



on Logan sills 399,409 



on Pewabic quartzite 104 



figures cited from 392,400,401 



geologic work in Vermilion district done b j' 30 



Chert, green, carbonate-bearing, characters of... 186-187 



magnetitio, plate showing 168 



white, characters of 185-186 



Chester, A. H., cited on iron region of northern 



Minnesota.. 75 



exploratory work done by 214 



Chester Peak, height of 36 



naming of --. 36 



See also Jasper Peak. 



Chippewa Indian Reservation, location of 20 



Chlorite-schists, occurrence of 253 



Clark, Thomas, and Anderson, C. L., report made 

 by, on geology and geological survey of 



Minnesota.. 66 



Clark, Thomas, and Hanchett, A. H., citation from, 

 on occurrence of hematite at Vermilion 



Lake 67,213 



on roiite from Grand Portage to Bainy Lake . 57 



report made by, on geology of Minnesota 66-67 



Clearwater Lake, breccia at 3.55 



metamorphosed rocks near 350 



Cleavage, slaty, occurrence of 177-178 



Clements, J. M., citation from, on spherulites in 



Michigan I'ocks — 153 



on spllosltes 345 



work done by 30 



Clements, J. M., and Smyth, H. L., cited on crystal- 

 line schist at Bone Lake, Michigan 168 



Cole, T. F., acknowledgments to 18 



aid by - 30-31 



Cole, G. A. J., and Gregory, J. W., cited on spheru- 



lltic sti'ucture - 146 



Coleman, A. P., report by, containing references to 



geology of Vermilion district 125 



Conglomerates, occurrence of 251-252 



Conglomerates and psexidoconglomerates, associ- 

 ation of 286 



distinctions between 252 



