CAMBRIAN ROCKS OF NOVA SCOTIA. POOLE. 243 



ever the extent of subsefjuent deposits may have been succeed- 

 ing cycles in their denudation, did little more by their removal 

 than revert to the Cambrian surface of the Pre-Carboniferous 

 peneplane. The lines of main drainage are of subaerial erosion 

 established before this period, and the general surface suffered 

 comparatively little by the subsequent passage over it of the 

 ice sheets, beyond the removal of much, but not all, of the 

 weathered and broken superficial material. The patches of 

 deposit we have been considering in their relation to the Cam- 

 brian at various elevations, make probable such a conclusion. 



A visit paid to the neighborhood of the head of Grand Lake 

 and to Kelly's Lake, lying back of Wellington station, disclosed 

 a conglomerate cemented with bog iron ore at the crossing of 

 the abandoned old road over the brook from Kelly's Lake. At 

 the outlet of Kelly's Lake, apparently daming back the waters 

 of the lake, occurs the conglomerate referred to by Dr. Honey- 

 man. It surface was seen to be rounded and a good specimen 

 w^as obtained smoothed and grooved. The character of the 

 rock, with its hematitic pebbles, bears a striking resemblance to 

 some of that about Gay's River, and left no doubt in my mind 

 that it also was, as Dr. Honeyman regarded it, of Lower Carboni- 

 ferous age, while the deposit lower down the brook w^as Post- 

 Pliocene. The contact of the vipper rock with the Cambrian 

 slates was not found exposed, but the strip appeared to be (juite 

 narrow, while it extended for a quarter of a mile or more to the 

 westward. Other exposures of the bog ore deposit are reported 

 to occur in the neiij-hborhood, and west of Wellingrton station. 



During the past sununer, attention was directed for com- 

 mercial purposes to deposits of liog iron ore which occur in a 

 strip of country two miles wide along the south side of the 

 Musquodoboit valley. These deposits are in low swampy 

 depressions of the blue black graphitic and ferruginous slates of 

 the Lower Cambrian, east and west of the Caribou gold district 

 with which they range. 



Proc. & Tra.\s. N. S. Inst. Sci , Vol. XI. Trans.-Q. 



