Mr. Bubble's Synopsis of the Newcastle Coal Field. 221 



A and B cropped out. 



C, The Shield Row Coal is not workable to profit at present, and only 

 extends over part of the district. 



D and E united, forming The Five quarter Seam. The seam yields 

 Coal of good second-rate quality, but is wrought out over a great part 

 of the district. 



F. The Brass-thill Seam yields Coal of second-rate quality ; is work- 

 ed out over a great part of the district. 



G, H, I, united, forming The Hutton Seam. This is the finest seam 

 in the district. The Coal is rather tender, but of the finest quality, and 

 being free from any admixture of Pyrites, or other foreign matter, it is 

 preferred for all metallic manufactures. This seam has supplied the 

 celebrated " Pitt's Tanfield Moor Coals" for upwards of a century. 

 It is now greatly exhausted. 



K. The Low Main Seam is not workable to profit at present, al- 

 though of good quality, on account of the soft and brittle nature of the 

 Coal. Remains entire over a great part of the district. 



L. The Crow Coal is not found of workable thickness. 



M. The Ryton Five-quarter Coal is not found of workable thickness. 



N. The Ruler Coal not of workable thickness. 



O. The Harvey's Low Main, or Busty Bank Seam, is of good 

 second-rate quality ; has only been partially worked for land-sale at its 

 crop, in the vale on the south side of the Derwent, and remains entire 

 through the whole district, as far as it has been proved. None of the 

 seams have yet been explored below the Busty Bank. Seam in this dis- 

 trict. But in the bed of the Derwent, on the west side of the old wag- 

 gon way bridge, near Gibside, a seam of Coal is to be seen, which I take 

 to be either the Three-quarter, or Bi-ockwell, of the Ryton district, on 

 which it borders. Thus it appears that the south bank of the Derwent, 

 from the summit of Tanfield Moor to the bed of the river at Derwent 

 Bridge, exhibits nearly a complete section of our whole Coal-bearing 

 strata. 



