ELY GREENSTONE. 131 



shows some of its most typical and interesting characters right in the streets 

 and lots of the city. For this reason the formation has been appropriately 

 called the "Ely greenstone."" 



OCCURREKCE AND CHARACTER. 



DISTRIBUTION. 



In the westernmost part of the district, in the vicinity of Vermilion 

 Lake, the area underlain by the greenstones has the form of a number of 

 large westward-projecting tongues. Beginning their enumeration from 

 south to north we find the first large tongue extending through the northern 

 portion of T. 61 N., R. 15 W. North of this there is another tongue, in 

 sees. 35 and 36, T. 62 N., R. 15 W. This is followed to the north by a third 

 tongue, in sees. 24, 25, and 26, of the same township and range. A number 

 of very small tongues are to be found in the northern portion of sec. 21, T. 62 

 N., R. 14 W. A very narrow greenstone belt extends to the southern 

 portion of sees. 15, 16, 17, and 18, T. 62 N., R. 14 W. Still' another 

 such tongue is in sec. 12, T. 62 N., R. 15 W., and extends, except in 

 one small area, eastward through sees. 7, 8, and 9, T. 62 N., R. 15 W. 

 Still farther north we find a tongue south of Bass Lake, in sees. 1, 2, 3, and 

 4, T. 62 N., R. 15 W., and one immediately north of this, just along the 

 line between T. 62 N., and T. 63 N. The northern side of Vermilion Lake 

 is bordered by this Archean greenstone, which has been followed out to the 

 west to the limit of the area mapped. The greenstone extends a long dis- 

 tance to the west of the Vermilion district, although it is discontinuous over 

 great areas. While it may be that this interruption of the continuity of the 

 greenstone in this portion of the State is due to its concealment in places by 

 overlying drift, it is also highly probable that even were this drift removed 

 we should find that the continuation of the greenstone is interrupted, as it 

 is in the vicinity of Vermilion Lake, by the overlapping of the younger 

 formations. 



In all cases these tongues, when followed out to the east, unite witli 

 the main mass- of the Archean which, along the line between Rs. 13 and 



«The term " Kawishiwin " has been proposed by the Minnesota survey (Gaol, and Nat. Hist 

 Survey of jNIinnesota, Final Kept., Vol. IV, 1899, pp. 270-271 and 546) to comprise the two formations, 

 which in this volumeare treated under the terms the " Ely greenstone" and the "Soudan formation," 

 as well as certain other rocks. Since this throws together two important formations that are here 

 treated separately, it has seemed necessary to introduce new names for each of these. 



