ANALYTICAL ABSTRACTS. 449 



around Kekequabic lake is a pyroxene granite, and associated with it is 

 peculiar pyroxene-granite-porphyry. The intrusive character of the granite is 

 particularly well shown between Sec. 31 and 32, T. 63 N., R. 10 W., near 

 Clearwater lake, and in the S. E. % of the S. W. % Sec. 26, T. 64 N., R. 9 

 W., on the west shore of Snow Bank lake. Along the Kawishiwi river, the 

 rocks mapped comprise gabbro, syenite, mica-schist, graywacke, etc. ; green- 

 stone and quartz-porphyry. The gabbro is the most recent, and covers part 

 of the older rocks. The syenite is older than the gabbro, and is younger than 

 the greenstone and mica-schist, both of which it cuts. The mica-schists, 

 graywackes, etc., are vertical, and have a general east northeast strike. These 

 have been formerly mapped as belonging to the Vermilion series, but there 

 seems to be good reason for putting all of this type of rock in the area 

 mapped into the Keewatin. The greenstone is presumably of Keewatin age, 

 and is probably younger than the mica-schists, graywackes, etc. Quartz 

 porphyry dikes are found cutting the greenstones in several places, but they 

 have not been seen in the other rocks in the immediate vicinity. 



Comments. — The conclusions of this report differ from the general succes- 

 sion given by Professor Winchell in the fundamental point that there is no 

 gradation between the granitic rocks and the metamorphosed sedimentary 

 rocks. Also all of the metamorphosed sedimentary rocks are regarded as 

 belonging to the Keewatin (Lower Huronian ?) while the Vermilion schists are 

 not found. If there now exists in this area the original basement upon which 

 the sedimentary rocks were deposited, this has not been found. It is of course 

 possible that such a Basement Complex does not exist in the Kawishiwi river 

 area, the one which was most rlosely studied, nor even in the entire region, 

 but this is not thought probable. 



Winchell (H. V.)' describes the Mesabi iron range of Minnesota. The 

 range extends from the Canadian boundary, a little south of west to the 

 Mississippi river, a distance of 140 miles or more, but is concealed for a part 

 of this distance by the later gabbro overflow. The Succession of the Mesabi in 

 descending order is : 



1. Gabbro unconformably on all the following Taconic. 



2. Black slates Animikie Taconic. 



3. Greenish siliceous slates and cherts Taconic. 



4. Iron ore and taconyte horizon Taconic. 



5. Quartzite unconformable on 6 and 7 Taconic. 



6. Green schists of the Keewatin Archean. 



7. Granite or syenite of the Giant's Range Archean. 



The granite of the Giant's Range is bounded on the north by a belt of 

 crystalline mica-schists and hornblende-schists, and on the south seems to 



' The Mesabi Iron Range, by H. V. Winchell. In 20th Annual Rep. Minn. Geol. 

 Sur., pp. 11-180. 



