108 THE VERMILION IRON-BEARING DISTRICT. 



In the study of tliese areas titers was no evidence found of a transition 

 from semicrystalline and crystalline schists into granite. On the other 

 hand, abundant evidence was found of the irruptive nature of the granite 

 rocks into the surrounding sediments. The Kawishiwi River and Snow- 

 bank Lake massive rocks are hornblende-syenites. The Saganaga rock is 

 a coarse hornblene-granite. That around Kekequabic Lake is a pj^roxene 

 granite, and associated with it is peculiar pyroxene-granite-porphyry 

 (pp. 37-38). 



The intrusive character of the granite is particulai'ly well shown where 

 the line between sees. 31 and 32, T. 63 N., R. 10 W., cuts the shore of 

 Clearwater Lake, and in the SE. i of the SW. ^ sec. 26, T. 64 N., R. 9 W., 

 on the west shore of Snowbank Lake. 



[Along] the Kawishiwi River . . . five distinct rock types [gabbro, sj^enite, 

 mica-schist, graywacke, etc., greenstone, and quartz-porphyry] are present. The 

 gabbro is the most recent; it 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, graj'wackes, etc., stand vertical, and have 

 a general east-northeast strike; thej' belong to what has been mapped as the Ver- 

 milion series, but there seems to be good reason for putting all of this type of rocks, 

 in the area of this map, into the Keewatin. The greenstone is presumably of 

 Keewatin age, and is probabl}^ younger than the mica-schists, graywackes, etc. 

 Quartz-porphyrj^ dikes are found cutting the greenstones in several places, but 

 the}' have not been seen in the other rocks in this immediate vicinity [p. 59]. 



The conclusions of this report differ from the general succession 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 closely studied. 



Grant, U. S. The geology of Kekequabic Lake in northeastern Minnesota, 

 with special reference to an augite soda-granite: Twenty-first Ann. Rept. Geol. 

 and Nat. Hist. Survey Minn., for 1892, 1893, pp. 5-68. With map, PI. IL 



In this article Grant describes in great detail an area approximately 

 5 miles square surrounding Kekequabic Lake. The distribution of the 



I 



