GILPIN ON THE GROUPING OF THE PICTOU COAL SEAMS. 283 



period later than that which brought the southern crops to the sur- 

 face, and the line of dislocation would be an upthrow going north. 

 The turn of the measures to the north-east would carry the main 

 seam under the town of New Glasgow, where it is overlaid by the 

 seams of the upper groups. 



The highest group on the east side of the river is the Marsh 

 Brook, containing the Captain, Geo. McKay, and Millrace seams, 

 with 158 feet of contained measures ; their average thickness is four 

 feet. This group forms an irregular basin the north crop of which 

 rests on the great north fault, and the south crop is broken by 

 faults bringing up lower measures. At the horizontal distance of 

 480 yards to the rise of their eastern crop is the McBean group. 

 This series contains an eight foot seam and several others not yet 

 fully examined; one 2ft. Gin. thick underlying about 80 feet is 

 said to be of excellent quality. The following description may be 

 more easily understood by the aid of a section drawn from Mc- 

 Bean's slope on the 8ft. seam to the East Eiver pit. The distance 

 on this line between the crops of the Marsh group is If miles, they 

 come to the surface at an easy angle and have been opened by 

 slopes. The crop of the McBean has not been found to the rise of 

 these seams, and in a short distance to the west the strata dip 

 again to the north-west, and we are crossing higher measures till 

 within 1500 yards of the East River pit, where the pitch reverses, 

 and a short distance further on two openings have been made on 

 seams dipping south-east and called the Lawson and Foster. The 

 East River pit was sunk on an 8ft. seam also dipping east of south. 

 A short distance to the rise is the Richardson seam, and continuing 

 from the Pottery pit to the river bank we find the measures con- 

 nected with the main seam and underlying to the south-east. 



Our section gives us two basins, the eastern of which contains 

 the Marsh group and the McBean dipping 33^ N. 55° W. The 

 other is underlaid by the Foster and Lawson seams believed to be 

 equivalents of the Millrace and G. McKay, and gives the western 

 crop of the McBean. As no explorations have yet proved the crop 

 of the McBean on the anticlinal, its probable form is that of an un- 

 dulation, and its crops are over four miles apart. The marked re- 

 semblance between the Richardson 2ft. 9in. and the 2ft. Gin. seam 



