DISTRIBUTION. 



163 



11. Northumberland and Durham Coal-field. 



Closing Hill Seam 



Hebburn Fell or Monkton Seam 



Five-quarter Seam 



Three-quarter or Black Close, 

 Moorland, or 70-fathom Coal 



High Main, Seven-quarter, or 

 Glebe Coal 



Stone Coal 

 Metal Coal 



Yard or Main Coal of the Wear 

 Bensham Seam 



Six-quarter 

 Five-quarter Seam 



Low Main or Hutton Seam 



Plessy, Crow, or Ryton Ruler 



Beaumont, Towneley, or Harvey 

 Seam 



Hodge Seam 



Tilley Seam 

 Hard Seam 



Busty Bank 

 Seam 



' Stone Coal 

 Five-quarter Coal 



Three-quarter Coal or Yard 



Brockwell Coal, Splint, or Main 

 Coal 



Lower Coal-measure with marine 

 shells 



With Carbonicola. 



With Carbonicola aquilina 17 feet below Bensham Seam. 



With Carbonicola aquilina. C. nucularis, Anthracomya Williamsoni, 

 A. modiolaris, Naiadites modiolaris, N. carinata at Whitley. 



With Carbonicola acuta and C. aquilina. 



With Carbonicola aquilina at Heworth. 



With Carbonicola at Seaton Delavel Colliery. 



With Carbonicola robusta, C. aquilina, and Naiadites modiolaris, and 

 with Anthracomya Adamsii, Horsleywood Seam, Wylaua. 



