26 



Pleistocene Glacial drift. 



Unconformity. 



Keweenawan (Nipigon) Conglomerate, sandstone, 



marl; diabase sills. 

 Unconformity. 

 Upper Huronian (Animikie) . Iron-bearing formation and 



black slates. 

 Unconformity. 



Lower Huronian Greywacke, greenstone, 



granite. 

 Unconformity. 



Keewatin Green schists, greenstones, 



mashed porphyries. 

 Mr. Smith's article in the Bureau of Mines report was 

 unaccompanied by a map, though one was published in 

 the Mining World and was used with minor changes by 

 L. P. Silver the next year in his report on the Animikie 

 iron rangs (8). In accordance with the findings of the 

 Special Committee on the Lake Superior region (9) Mr. 

 Silver altered the legend given by Mr. Smith, so that his 

 interpretation of the geological sequence is as follows: — 



Pleistocene Glacial drift, residual clays, 



beach sands and gravel. 

 Unconformity. 



Logan Sills Diabase, diorite or gabbro 



intruding all the following 

 formations. 

 Igneous contact. 



Keweenawan (Nipigon) Conglomerate, sandstone, 



impure marls. 

 Unconformity. 

 Upper Huronian (Animikie).. Iron - bearing formation, 



black slates, impure lime- 

 stone and quartz conglom- 

 erate. 

 Unconformity. 



Middle Huronian Granite (igneous contact). 



Lower Huronian Conglomerate, greywacke, 



greenstone, quartz por- 

 phyry, amphibolite. 

 Unconformity. 



Keewatin Quartz porphyry. 



The map accompanying Mr. Silver's report has been 

 used in the preparation of the accompanying sketch map 



