14 ILLUSTRATIONS. 



Fig. 9. Horizontal section through fourth and sixth levels of the Chandler mine 217 



10. Vertical east- west section through the Chandler mine 218 



11. Vertical section through the Chandler ore basin along the line A-B of fig. 9 219 



12. Reproduction of sketch showing replacement of jasper by iron ore 231 



13. Cross section at No. 8 shaft, Soudan, Minn 235 



14. Horizontal section through the fifth level of No. 8 shaft, Soudan, Minn 236 



15. Longitudinal section through Soudan mine 237 



16. Cross section of Soudan mine showing raise 238 



17. Deta,il geologic map showing exposures in a small area on West Gull Lake 272 



18. Detail map of east end of Ely Island 282 



19. Sketch showing intricate relationship of granite-porphyry and overlying Ogishke con- 



■ glomerate on Ely Island, Vermilion Lake 290 



20. Sketch showing relationship of Ely greenstone and overlying Ogishke conglomerate on 



island in Ogishke Muncie Lake '22 



21. Diagrammatic section across the west end of Gunflint Lake, illustrating the character- 



istic topography of the Rove slate area 392 



22. Large-scale section through the Eove slates with intercalated Logan sills 400 



23. Sketch map showing the distribution of the Vermilion moraine in the Vermilion dis 



trict of Minnesota 427 



