PETROGRAPHIC GEOLOGY AND DESCRIPTIONS. 357 



Granite. Schist.] 



' Meg. Eock similar to No. 912. 



Mic. The section shows biotite, hornblende, quartz and andesine, with a little 

 garnet, magnetite, sphene and pennine. 

 Two sections. 

 Age. Archean (Coutchiching). N. H. w. 



No. 414. GRANITE. 



Near the outlet of Vermilion lake, eastward from Outlet bay. 

 Ref. Annual Report, ix, page 100; Annual Report, x, page 95. 



Meg. Light-colored, or flesh-red, coarse, biotitic. 



Mic. Microcline, quartz and orthoclase ( ?), the last being entirely kaolinized. 

 The microcline is fresh and bright, presenting a perfect exemplification of the char- 

 acteristic structure. It affords a suggestive contrast with the much decayed other 

 feldspar, and may be of secondary date. There is a little biotite. 



One section. 



Age. Archean (igneous). N. H. w. 



No. 415. BIOTITE SCHIST. 



Embraced in No. 414. This rock is entirely like Nos. 412 and 413. 



One section. 



Age. Archean (Coutchiching). N. H. w. 



No. 416. BIOTITE SCHIST. 



Location uncertain; in the vicinity of Outlet bay and Avis island. 

 Ref. Annual Report, ix, page 100. 



Meg. Glistening mica schist. 



Mic. The mica is less abundant in the slide than would be supposed from the 

 color and general aspect of the rock, but a fresh feldspar is abundant. The mica 

 has been partly changed, apparently to chlorite. The feldspar is, in part, at least, 

 sti'iated, but in the absence of crystallographic characters in those sections giving 

 bisectrices, it is not possible to determine the species by the microscope alone. 



One section. 



Age. Archean (Coutchiching). N. H. w. 



No. 417. BIOTITE SCHIST. ( Garnetiferous. ) 



Location uncertain, but at some point on the east side of Outlet bay of Vermilion lake. 

 Ref. Annual Report, ix, page 100; Annual Report, x, page 95. 



Meg. Dark, fine-grained, firm mica schist. 



Mic. Much resembles rock No. 412, in having much-clouded feldspar, but in 

 that respect differs from No. 416. It also contains considerable quartz. Garnet, 



