UNCONFORMITY OF ANIMIKE AND KKWATIN' SCHISTS. 



389 



Animike flint schists, dipping five degrees southward, have been traced by 

 me to within seven feet of the sericitic argillites of the Vermilion series, 

 dipping northeast about 67 degrees." 



Other unconformable contacts of the two systems have been observed by 

 the Minnesota Survey. In travelling northward from Ogishke-muncie lake 

 the bowlders of the Ogishke conglomerate gradually disappear, and the 

 groundmass remains as an ordinary, evenly bedded argillite. At the distance 

 of two miles it becomes the porphyrellite schist so characteristic of the region 

 of the arms of Knife lake. Before reaching Knife lake, Epsilson lake is 

 passed. Here, on the north shore, the two systems of schists are seen in 

 contact. There is a general resemblance in external characters, and this is 



K E W AT I N 



A N I Ml I K I £ 



Fioure 12. — Showing Unconformity of the Animike «nri Kewatin Schists on EpsiTon Lake. 



emphasized by the fact that the same system of cleavage passes through both ; 

 but the real unconformity of the two systems is revealed by the ribboning 

 of, the sedimentary bedding, which in the case of the Kewatin schists is 

 vertical and coincident, as usual, with the cleavage, but in the case of the 

 Animike schists is inclined to the cleavage at an angle of 43°. 



I do not regard it necessary to cite in detail other examples of uncon- 

 formitv,but some will be found mentioned under the references given below.* 



Classification of the Foregoing Rocks. 



The enumeration which I have made embraces all the bedded rocks of 

 the vast region northwest of the Great Lakes, up to the so-called " Kewee- 

 nawan system." This is all there is of northwestern geology up to the hori- 

 zon named. So far, at least, as the great groups are concerned, the order of 

 succession is simple and plain. We may write them down with confidence 

 as follows, beginning above : 



V. The Uncrystalline Schists (Animike, Huronian ). 



IV. The Semi-Crystalline Schists (Kewatin). 



III. The Crystalline Schists (Vermilion). 



II. The Gneissoid Rocks 1 , T N 



t rru n ■* -a t? i C (Laurentian). 

 I. I he Granitoid Rocks J 



^-Sixteenth Annual Report, Minnesota Survey, 1887, pp. f>7, 69, 73, 87, 357, 358; Seventeenth Report, 

 1888, pp. 87-8, 91, 104-'5, 109-'10. 



LI— Bull. Geol. Soc. Am., Vol. 1, 1889. 



