ILLUSTRATIONS. XV 



Page. 

 l''i<;. 17. Intrusive greenstone in griinerite-m;ignetit.e-scbist, from near center of sec. 12, T. 47 N., 



R. 29 W 330 



18. Minor plications in ferruginous slate interlaminated with schistose greenstones, on 



Chicago and Northwestern Railway, east of Negaunee 332 



19. Folded ferruginous chert of Starwest mine 334 



20. Horizontal plan of contact of Goodrich quartzite on plicated Negaunee jaspilite 335 



21. Cross-section of contact of Goodrich quartzite on plicated Negaunee jaspilite 33.5 



22. Jaspilite of Republic mine, showing white areas of chert in the red jasper 362 



23. Horizontal plan of one of the minor pitching isoclinal folds in griinerite-magnetite- 



schist 384 



24. Section showing relations of griinerite-magnetite-schist and intrusive diorite, Mount 



Humboldt 386 



25. Plat showing relations between griinerite-magnetite-schist and intrusive diorite. Mount 



Humboldt 386 



26. Section showing relations of jasper, ore, conglomerate, and quartzite at Micbiganime 



mine 420 



27. Position of specimens of greenstone from south half of sec. 12, T. 47 N., R. 27 W 492 



