388 THE VERMILION IRON-BEARING DISTRICT. 



point where the conglomerate was seen, but it does appear a few paces to 

 the east. On the north side of the road, in sec. 30, T. 65 N., R. 4 W., 

 about 500 paces east of Fay Lake, there were found several trenches 

 which cut through the ii'on formation and showed its contact with the Ely 

 greenstone. Here it seemed to rest upon this greenstone without any 

 intervening conglomerate. Still farther east, at the west end of the 

 Duluth, Port Arthur and Western Railroad, just west of Paulson's camp, 

 the cut has exposed the Ely greenstone with a film of the Gunflint forma- 

 tion lying above it. At this place no well-marked conglomerate exists. 

 The greenstone is more or less broken tip and some of the iron formation 

 ■ material has been infiltrated in these cracks, so that on the surface it looks 

 conglomeratic. A glance at the maps in the atlas will show that the area 

 just mentioned, in which the two exposures of greenstone in contact with 

 the Gunflint formation occur, is at the place where the Ely greenstone 

 makes its greatest bend to the south. 



Relations to the Lower Huronian series — Ogishke conglomerate and Knife 

 Lake slates. — The Ogishke conglomerate occurs east and west of the south- 

 ward projecting point of Ely greenstone in sec. 30, T. 65 N., R. 4 W., and 

 sec. 25, T. 65 N., R. 5 W. It is very thin to the east, and in fact its pres- 

 ence has been detected in only one place, as the result of an examination 

 of the dump heaps of the pits northeast of Paulson's mine, in the NW. \ of 

 sec. 27, T. 65 N., R. 4 W. These pits are just north of the ridge of Gun- 

 flint formation, and are in typical bedded rock. This bedded rock occurs in 

 the tipper part of the pit, as one can readily see. The lower part of the pit 

 is now filled with water, but some rock on the dump and that forming the top 

 part of the dump, presumably material last taken from the pit, has a distinctly 

 conglomeratic appearance. The matrix is, liowever, very coarsely crystal- 

 line, and the supposed pebbles are well rounded. The kinds of rock which 

 constitute the pebbles could not be determined. This conglomerate certainl}' 

 resembles very closely, if it is not identical with the Ogishke conglomerate, 

 which occurs farther to the west. There is a bare possibility that it repre- 

 sents a conglomerate at the base of the Gunflint formation belonging with 

 the Upper Huronian series, but, if so, it could not be discriminated from 

 the Ogishke. 



West of the southward-projecting greenstone point above mentioned 

 the Ogishke conglomerate appears in typical development. Tt is first seen 



