436 - THE VERMILION IRON-BEARING DISTRICT. 



of lakes connected by a stream is found along the contact between the iron 

 formation of the Lower Huronian and the Lower Huronian Ogishke con- 

 glomerates. A similar topographic depression can be followed between the 

 contact of the granite and the greenstones in sees. 26, 27, 28 and 29, T. 62 

 N., R. 13 W., and in sees 17, 9, 3, 11, and 1, T. 62 N., R 12 W., to sec. 81, 

 T. 63 N., R. 11 W., south of Ely. 



The above-mentioned instances are only some of the more important 

 and most noticeable of the many cases which occur in the Vermilion 

 district, and which might be cited as illustrating the dependence of topog- 

 raphy upon geologic structure. Some of the other cases have been 

 referred to in the more detailed descriptions of the various kinds of rocks 

 and of the special areas. 



