in Birch-hill Colliery, 



253 



The following Is a list of the strata in pit B, from the surface to 

 tJie greatest depth that has been hitherto attained, viz. 216 feet. 



1. 



2. 

 3. 

 4. 



5. 

 6. 

 7. 

 8. 



9. 

 1«. 



11. 



12. 

 13. 

 14. 

 13. 



16. 



17. 

 18. 

 19. 



20. 



21. 



Soil and grayel 



Blue and grey clunch with balls and measures of ironstone 



Coal (not worked) 



CluncJi mixed with ironstone, and including a bed of the 

 same 1 5 inches thick 



The open-work, and the six pits called by the rainer;^ 

 Stone-pits (marked er,ff in the plan) are for the purpose o< 

 procuring the ironstone contained in the beds already 

 mentioned, and therefore on an average do not exceed the 

 depth of 54 feet. 



Coal (not worked) . . . , 



Fire clay ^ .'. 



Rock binds (slaty clayey sandstone) 



First coal or Yard coal 



The Yard coal is the first coal which lias been worked : 

 it is soft, and applicable only to domestic purposes or t( 

 the roasting of the ironstone : its thickness varies from 2C 

 inches to a yard. The three pits marked d in the plan an 

 sunk into this bed : their average depth does not exceet 

 90 feet. 

 Sandstone, the upper part of the bed slaty, the lower compac\ 



Strong coal 



This is the second workable coal ; it is of good quality 

 and is coaked for the use of the furnace. 

 Alternations of compact sandstoncj slaty sandstone, slatj 



clay, and clay 



Coal and bituminous slate (not worited) 



Brown clay 



Sandstone and indurated clay 



Black slaty clay inclosing three beds of ironstone of 9, 3. 



and 5\ inches in thickness 



Trap (green rock) 



The pits A & C are sunk into the trap, the one to the 

 depth of half a yard, the other to the depth of five yards, 

 but neither of them passes through this bed. 



Indurated sandstone 



Carbonaceous slaty clay and blind coal 



Slaty clay 



Strong hard bituminous coal 



The above two beds of coal, with the thin interposed 

 bed of slaty clay, form the third coal which is worked. 



Fire clay 



The Ijigine pit, the Bye pit, and the pit marked B, 

 terminate in this bed. 



Ft. 

 4 



12 



2 



33 







10 



5 







27 



2 



2 



2 



In, 

 



6 

 



54 



89 2 



38 



4 



4 



1 



28 



2 



1 



6 



11 







3 



6 



10 



10 



12 







3 







4 



4 



1 



6 



4 



6 



200 7 



-215 11 



