304 



THE PICTOU COAL FIELD — POOLE. 



This section it will be noted shows that the Deep seam has, in 

 this locality, a total thickness of 40 ft 5 in. which is in excess of 

 any measurement in the Main seam : although that seam liitherto 

 has had the reputation of being the thickest in the tield, and 

 was found to be 89 ft. 11 in. in the Cage pit shaft sunk to the 

 Deep seam by the side of Coal brook. 



Another modification is shewn in the section of the Deep seam 

 taken at the bottom of the English slope, 2700 feet on the 

 incline and about 900 feet vertical, 



Ft. 111. 



Coal, coarse 5 



" fairly good 1 



'■ coarse 6 



" good 1 9 Little seam.. 



Ironstone band, coaly 10 



Coal, very impure 2 8 



" oood 1 6 



Shale roof of workings 9 



Coal, very good 1 



" good I 



" fairly good 1 3 



" very coarse 1 4 stone bench. 



" very good 3 9 



" coarse 4 



" fairly good 2 4 



" coarse 1 



Pavement, fireclay .... Total . . 24 1 



The explorations in 1852 already referred to (Proceedings of 

 the Geol. Soc, 1853, page 47), disclosed an increasing substitution 

 of arenaceous for argillaceous beds overlying the Main seam as 

 the crop was followed westward from the river. The Forster 

 pit, section 5, on page 72 of the Report, confirmed the change 

 which the Colin pits had previously discovered. When the seam 

 was traced in the opposite direction a similar substitution was 

 also found to occur. Section G, page 74, of the Report shows 



