ILLUSTRATIONS. 



Pag© 

 Plate I. Portions of Burt's, Hiil>l)ard's, and Ives's maps of the Upper Peninsula of 



Michigan 2*^ 



II. Portion of Foster and Whitney's map of the Lake Superior hmd district 26 



III. Fig. 1. I'ortion of Brooks's map of the Upper Peninsula of Michigan 58 



2. Irving's outline map of the Marquette district 5S 



IV. Fig. 1. Greenstone schist kuob, Dead River 152 



2. River course through Mona schist 152 



V. Pebbles from Kitchi schist IW 



VI. River course through granite 1"0 



VII. Fig. 1. Weathered surface of Kona dolomite 24(5 



2. Brecciated chert at the base of the Kona dolomite 246 



VIII. Fig. 1. Brecciated chert in Kona dolomite 250 



2, Brecciated chert in Kona dolomite 250 



IX. Fig. 1. Shattered Wewe slate 262 



2. Brecciated Wewe slate 262 



X. Fig. 1. Recomposed rock, resembling granite, from Wewe slate 280 



2. Ferruginous Siamo slate, showing overthrust fault 280 



XI. Dome structure of griiuerite-magnetite-schist, caxised by intrusive greenstone. 328- 



XII. Inclusions of griiuerite-magnetite schist in intrusive greenstone, east of Spuir 



mine ^^^ 



XIII. General view of Lake Angeliue from the east, showing bluffs of greenstone, 



and lowlands underlain by the Xegaunee formation 332 



XIV. View southwest from Lake Bancroft, showing on the right a greenstone bluff, 



and in the distance greenstone hills and lowlands, underlain by the Xegau- 

 nee formation ^•^* 



XV. Open pit of Cleveland hard-ore mine, looking west, showing minor folds in 



jasper ^^^ 



XYI. View of westward-pitching fold in No. 1 pit. Lake Superior Iron Company, 



looking west. The rocks in the center of the figure are the Goodrich 



quartzite, and these are underlain by the Xegaunee .jasper 338 



XVII. Fig. 1. Cherty siderite, from the Marquette district 340 



2. Cherty siderite, from the Penokee district 340 



XVIII. Fig. 1. Magnetite-griinerite-schist, from Republic mine 342 



2. Sideritic magnetite-griinerite-schist, from sec. 13, T. 47 N., R. 27 W 342 



XIX. Fig. 1. Gruueritic magnetite-schist, from Republic mine 344 



2. Ferruginous slate, from sec. 7, T. 47 N., R. 26 W 344 



3. Ferruginous slate or jasper, from sec. 7, T. 47 N., R. 26 \V 344 



xm 



