GILPIN — PICTOU COAL FIELD. 95 



It is estimated by Sir W. Logan that the McBcan 8 foot seam 

 underlies the Marsh group at a vertical depth of 700 to 800 feet. 

 The thickness of the measures between the oil shales and the 

 Fulling Mill being only 437 feet by actual measurement, it would 

 not appear possible to find the outcrop of this seam south of the oil 

 shales on McLellan's Brook, as it probably abuts against the Fulling 

 Mill fault at a considerable depth from the surface. 



Were the Mill road fault absent, or of comparatively small 

 extent, the task of comparing the various horizons would be a slight 

 one, as but one set of faults would require to be accounted for. 

 A comparison might then be confidently made between the 3 feet 

 seam and black shales found above the Fulling Mill, and the 3£ 

 feet seam on McLellan's Brook near the Halifax Company's east 

 line, which is also found near the mouth of Coal Brook on the 

 Intercolonial Railway and further to the westward. The underly- 

 ing seams of the Albion group would then reach the South fault 

 toith a strike to the east of south, and leave the fault again as 

 the measures lying to the south of the McBean seam assume their 

 north-east line. 



This form would show that the eastern half of the district pos- 

 sesses an almost similar structure to that found at Westville, where 

 the interception of an undulation by a fault has hidden the crop of 

 the Main or Acadia seam for a short distance in the vicinity of the 

 Grog Brook. 



In a paper read before you about two years ago, I gave what I 

 considered grounds for the equivalence of the Widow McLean and 

 the Albion groups. 



The identity of these groups was supported, in addition to other 

 arguments, by the fact, almost too strong to be a coincidence, that 

 both these series of seams are overlaid at a height varying from 

 1300-1600 feet by a set of comparatively small coal seams, and 

 that as yet no coal has been found in the intervening strata. 



During the summer of 1874 another seam has been found in this 

 series overlying the Main seam. Its thickness is about 4 ft. 6 in. 

 which you will observe closely, agrees with that of the Mountain or 

 Haliburton seam. There have not been any attempts yet made to 



