PETROGRAPHIC GEOLOGY AND DESCRIPTIONS. 701 



Conglomerate. Actinolite schist.] 

 Graywacke. Quartzyte. 



Mic. The coarser-grained rock is identical with the last. The original feldspars 

 were coarsely twinned and the quartzes appear to have been derived from an 

 eruptive rock. 



The finer rock (which is very fine) is dark with all the colored minerals, 

 particularly with biotite. There are spots in the slide where these biotite scales are 

 prevailingly set edgewise across the section. Then by their greater polarization 

 colors they give the whole slide a spotted aspect, which is increased by the occurrence 

 of actinolite in the same areas. Two sections. 



Age. Probably Upper Keewatin. N. H. w. 



No. 1356. CONGLOMERATE. 



At about the centre of the N. E. % sec. 31, T. 65-5. 

 Ref. Annual Report, xvi, pages 91, 122. 



Meg. Supposed to be a portion of the Ogishke conglomerate when collected. 



Mic. The rock is undoubtedly a part of the Ogishke conglomerate, having the 

 peculiar twinned feldspars and parts of their matrix, like the Kekequabic porphyry. 

 Compare Nos. 1062-1066, 1080, 1095. One section. 



Age. Keewatin (Ogishke). N. H. w. 



No. 1357. ACTINOLITE SCHIST. 



A little northeast from the last. 



Ref. Annual Report, xvi, pages 91, 122. 



Meg. Fine grained, grayish green. 



Mic. The rock consists very largely of fine spicules of actinolite, which are rarely 

 in union, but lie criss-cross in a mesh, with minute feldspar and quartz grains between. 

 One section. 



Age. Keewatin (Ogishke). N. H. w. 



No. 1358. GRAYWACKE. 



South shore of Gabernichigama lake, near the southeast corner of sec. 31, T. 65-5 W. 

 Ref. Annual Report, xvi, pages 91, 122. 



Meg. A fine-grained, compact, siliceous graywacke or quartzyte. No section. 

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



No. 1359. QUARTZ YTE(?) 



Near the same place ; probably a little southwest. 

 Ref. Annual Report, xvi, pages 91, 122. 



Meg. A rather fine-grained, granular, yellowish rock. The hand sample shows 

 large reflecting cleavage faces of some mineral, perhaps biotite, which includes poi- 

 kilitically the smaller grains of the rock. 



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



