3o8 



H. C. COOKE 



recognized by each set of investigators. To determine if possible 

 which of these hypotheses was the correct one, the writer in 191 9 

 visited Larder Lake and made a study of the part of the area in 

 doubt. 



INVESTIGATIONS AT LARDER LAKE (FiG. 2) 



A conglomerate outcropping prominently on the Larder town- 

 site was the first thing to attract the writer's attention. This 

 conglomerate is mapped by Brock and Wilson as belonging to the 



Scale of Mi/es 

 M f G /? R. R y 



r^t'Ssi^Drift covered 



WVvmarns Maxwell (»/~S^-^,„ . ^ I ra-s-sn 



\C0b3lt ^^^pmisfoining 



\8d53lL5 3f 



Rhyolites 



Fig. 2. — Larder Lake area 



Cobalt series, but evidently with reservation on the latter's part, 

 as he describes it thus:^ 



There is an area of mashed conglomerate on the north shore of Larder 

 Lake, at Larder City, which has been intruded in a most complex manner by a 

 hornblende lamprophyre, vogesite. The pebbles of this conglomerate differ from 

 the normal type in that they consist entirely of quartz porphyry, rhyolite, and 



iron formation The occurrence of the lamprophyre cutting the sheared 



conglomerate suggests that this conglomerate may be the equivalent of Dr. 

 Miller's Timiskaming series. 



Again, on page 37: 



In the neighbourhood of Larder Lake there are numerous areas of con- 

 glomerate which have been greatly mashed in a direction parallel to the strike 

 of the underlying Keewatin. These conglomerates might have any one of 

 the three following relationships to the other rocks of the region: (i) They 

 might be Keewatin conglomerates deposited between the volcanic flows of 



^ Geol. Surv. Can., Mem. No. 17, p. 38. 



