PETROGRAPHIC GEOLOGY AND DESCRIPTIONS. 335 



Schist. Syenyte. Granite.] 



No. 362. HORNBLENDE SCHIST. 



Same locality as No. 360. 



Ref. Annual Report, ix, pages 93, 94. 



.W/'/. A green rock, somewhat similar to the last two, but decidedly more 

 schistose. It seems to contain chlorite and sericite as well as hornblende. 

 No section. 

 Aye. Archean (Coutchiching). u. s. G. 



No. 363. HORNBLENDE SCHIST. 



Same locality as No. 360. 



Ref. Annual Report, ix, pages 93, 94. 



Mccj. A dark-green rock, finer grained than Nos. 360 and 361; composed of 

 hornblende and some grayish feldspar, rather evenly distributed. 

 No section. 

 Age. Archean (Coutchiching). u. s. G. 



No. 364. SYENYTE. 



Same locality as No. 360. 



Ref. Annual Report, ix, pages 93, 94; Bulletin ii, page 87. 



Meg. A rather coarse-grained, granitic rock, composed of hornblende and gray 

 to pinkish feldspar. 



^fi(. The section is too thick for careful study. It shows green hornblende and 

 much decayed feldspar, which is probably largely orthoclase. 



One section. 



Aye. Archean (Coutchiching). u. s. G. 



No. 365. GRANITE. (Chlaritlc. ) 



Same locality as No. 360. 



Ref. Annual Report, ix, pages 93, 94. 



M<'<j. A pinkish medium-grained granitic rock, composed of gray to pinkish 

 feldspar, quartz and chlorite. 



Mic. The section shows a large quantity of feldspar, with less quartz and a 

 little chlorite. The feldspar is highly kaolinized; it does not usually show twinning 

 striae; some of the grains, however, show minute twin lamellae which fade out in 

 more altered parts of the same grain, thus suggesting that possibly all the feldspar 

 was originally twinned. Its species cannot be certainly determined, but it is probably 

 oilhudase and nnoii/iocftt.^e or oligoclase. The quartz shows very pronounced undu- 

 latory extinction. The chlorite is in small amount and is intimately associated with 

 a brownish mineral, perhaps bowlingite. A few very minute grains of cpidote are 

 present. One section. 



Age. Archean (Coutchiching near transition to Laurentian). u. s. G. 



