DISTRIBUTION. 163 
11. NorrHUMBERLAND AND Duraam 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 
Stone Coal 
Seam 
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 Carbonicula aquilina at Heworth. 
With Carbonicola at Seaton Delavel Colliery. 
es 
i 
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ae 
With Carbonicola robusta, C. aquilina, and Naiadites modiolaris, and 
with Anthracomya Adamsii, Horsleywood Seam, Wylam. 
