228 Mr. Bundle's Synopsis of the Newcastle Coal Field. 



The Monkton Seam crops into the dilivium, between Howdon and 

 Percy Pit, and does not appear any more on the line of the section, 

 although it may be supposed to be thrown in again on the north side of 

 the Main Dyke, but I am not yet aware that it has been found there. 



The Three-quarter Coal is found in Jarrow, Howdon, and Percy 

 Main Collieries, but seems to be nipped out, or not to have been depo- 

 sited in Collingwood Main. It is, however, found again in the collieries 

 on the north side of the Main Dyke ; and continues on the line of the 

 section, till it crops out for want of cover, at about half a mile to the 

 north of Holywell Pit. 



The High Main Coal is found on every part of the line of section, 

 except for about 150 yards, where it is thrown out into the soil by the 

 40-fathom Dyke in Collingwood Main Colliery, and for a short space next 

 the Main Dyke, where the seam is nipped out by undulations in the 

 Main Post. This seam varies very much in thickness and character 

 on various parts of the line ; and from its having been explored 

 along the whole line of the section, has been taken as the standard for 

 defining the position of the lower seams b}'^ analogy, where no sinkings 

 or borings have been made to them. 



The Metal Coal, Stone Coal, and Yard Coal Seams, lie through the 

 whole line of the section, and are found of various thicknesses and qua- 

 lities in different places. 



The Bensham Seam is found on every part of the line of section. 



The Five-quarter Seam lies through every part of the line, but is 

 not workable any where. 



The Low Main has only been proved at Jarrow and Collingwood 

 Main, on the line of section, but is known to exist at Whitley, Hartley, 

 and Cowpen. 



All the remaining seams of the series are supposed to exist on this 

 line of section, but as they have not yet been proved, they are not re- 

 presented. 



