196 H. C. COOKE 



The conglomerate on the limbs of the fold has been so sheared 

 as to deform all the pebbles, as in the case of the conglomerate 

 described in the Brock area. At the nose of the anticHne, how- 

 ever, the rock is undeformed. The number of pebbles is so great 

 that very little of the greywacke matrix is observable. The 

 majority are unusually well rounded and of all sizes, up to eight 

 inches in diameter. The material is very poorly assorted and 

 markedly cross-bedded. The variety of the pebbles is great. 

 About 50 per cent of the total number are of light-colored biotite 

 granite; a few, about 4 or 5 per cent, of a still more siliceous granite, 

 with almost no ferromagnesian mineral; 10 to 15 per cent consist 

 of dark, bluish chert, often banded; while the remaining 30 per 

 cent are quartz and various basic rocks, hornblende schist, ande- 

 site, etc., most of which can be matched in the lavas below. 



The underlying series, which was named the Lake Evans series 

 in 191 2 consists near the base of basalts overlain by porphyritic 

 andesites. Some thin-bedded, fine-grained, slaty tuffs were found 

 overlying the andesites on Storm Lake; probably overlying these 

 tuffs, and directly underlying the Broadback conglomerate, are 

 some thin beds of garnetiferous mica gneiss, petrographically similar 

 to certain of the members of the Nemenjish series. The structure 

 of these rocks could not be worked out in detail on account of lack 

 of outcrops, but the strike and dip of the bedding, wherever observ- 

 able, is approximately parallel to the bedding of the overlying 

 Broadback sediments. 



As already stated, the general structure of this area is that of 

 an anticline, whose axis has a strike of S. 75° E., and a low plunge 

 to the east. If the axis of this fold be projected eastward across 

 the intervening granite area, it is found to pass through the Lucky 

 Strike area; so that these two areas probably form the two limbs 

 of a large synclinal cross-fold, whose axis strikes N. 15° E. If so, 

 the plunge of the Lucky Strike anticline, which was not determined 

 in the field, must be toward the west. 



The succession in the Kenoniska area therefore is : 



Mica schist Nemenjish series ( ?) garnetiferous 

 Quartzite mica schist 



Arkose Slaty tuffs 



Conglomerate Andesites 



Unconformity Basalts 



