NORTH SYDNEY AND SYDNEY MINES, C. B. De\VOLFE. 323 



berland county, Peniiirtii strata have shared in the general 

 deformation ; or as in Pictou county, have been slicrhtly 

 deformed, but less than the Coal Measures. Thus there appears 

 to have been a o-eneral orog-enic disturbance at the close of the 

 deposition of the Coal Measures, with less, and perhaps more 

 local, warping during or after the Permian. 



As no Permian is met in the Sydney district, the exact date 

 of uplift cannot be fixed ; but it is to be presumed that it was 

 at the close of the Coal Measures, or Carboniferous proper. 



The effect Wiis to make a large syncline in tlie form of a 

 partial basni, with its margins well defined on the northwest, 

 west, southwest and south. This was broken up into subor- 

 dinate basins largely by the influence of the two cores of old 

 rocks referred to above. The Coxheath core most afiected the 

 area under discussion ; and its effects may be seen in tlie north- 

 west dip of the Carboniferous near the head of Sydney harbor, 

 changing gradually to the normal northeast dip as one recedes 

 from the source of influence. 



Both the mountain cores gave to the enwrapping sediments 

 the attitude of local anticlines, plunging sharply northeast, and 

 dying out near the present shore of the island. These folds acted 

 merel}', however, as local interruptions to the general basin 

 structure. 



Absence of post-Carbo7i if ei'ous strata. — Except the Triassic 

 area in the western part of the province, there are no rocks t ) 

 be found between the Permian and the Pleistocene. In the 

 Sydney district, as elsewhere, it is presumable that tlie land \yas- 

 above water constantly after the end of the Carboniferous. 

 The evidence here is purely negative — absence of subsequent 

 formations ; but throughout the province as a whole, the drain- 

 age patterns made by the streams point to a very ancient 

 emercrence of the land. 



Proc. & Trans. N. S. Inst. Sci., Vol. X, Trans V. 



