Mr- Bubble'' s Synopsis of the Newcastle Coal Field- 237 



has been ascertained to be divided into four branches to the eastward, 

 and to run out thus — 



What becomes of it to the west is not known. 



The next is a downcast of 25 fathoms, which sphts into three branches 

 to the eastward, and, like the former, runs out. To the westward it is 

 supposed to be connected with the l6-fathom Dyke. 



The next is the Heworth Main Dyke, and is an upcast of 25 fathoms 

 to the south-west. This is a well-known Dyke, having been proved in 

 Dunston Haughs, by the skirt of Whickham Banks, and in Blaydon 

 Main ColHery near to Axwell Park. It is here called the Shipdon 

 Dyke> It then runs in a north-western direction, and crosses the Main 

 Dyke at Stephen's-hall in Townley Main Colliery, but in the crossing, it 

 is changed to a downcast to the south, of 4 fathoms. It then continues its 

 line of direction past the new winning in Crawcrook Colliery, and across 

 the Tyne between Close House and Wylam Colliery, where it increases 

 to 4-0 fathoms, and brings the seams, which are wanting on its eastern 

 side, down into Wylam Colliery. 



The only Dyke which remains to be noticed on this Section is the 

 10-fathom downcast, to the south, in Sheriff-hill. This Dyke runs in an 

 east and west direction, on the south side of Heslop's Pond ; it is sim- 

 ply a Slip Dyke, and does not require any further remark. 



It will be observed that this Section deviates materially from a 

 straight line, but I preferred directing its course to those points where 

 the strata had been correctly ascertained by sinkings or borings. Part 

 of the Section is, however, unavoidably filled up by analogy, from the 

 absence of information. I regret that this is the case with respect to 

 Jarrow Pit, the sinking account of which, to the High Main Coal, I 

 have never been able to procure. I have, therefore, been obliged to 

 substitute the strata sunk through in the Hebburn B Pit, which, from its 

 nearness and similar depth, as well as an absence of Dykes between, 

 afforded the best scale I could adopt, 



