Mr. F. Forster's Observations on the South Welsh Coal Basin. 109 



The following detailed Vertical Section of the Strata, commencing a 

 few fathoms beneath the " Fraith Seam" {see the south end of division 

 No. 2) will shew the nature of the intervening beds with which the Coal 

 seams near the centre are associated. The strata in this section, chiefly 

 argillaceous, are immediately underlaid by a thick series of Sandstone 

 beds intervening between the central and lower Coal seams, which 

 latter, as well as the principal beds of Ironstone, are interstratified with 



Shale. 



SECTION. 



Soil and Clay, 



Clay and Gravel, 



1. Soft Grey Metal Stone, with 



Clay partings, 



2. Strong Grey Metal, with soft 



partings, 



3. Strong Grey Metal, mixed 



with Post and soft partings, 



4. Strong Grey Metal, mixed 



with Grey Post, 2 



5. Soft Blue Stone, with Clay 



partings, 2 



6. Grey Post, mixed with Whin, 1 



7. Grey Post, mixed with Blue 



Metal Stone, 2 



8. Grey Post, mixed with Blue 



Metal Stone, and Whin 

 Girdles, 



9. Grey Post, mixed with Blue 



Metal Stone, with soft part- 



F7m. 



Ft. 



In 



1 











1 



3 







2 2 



2 10 



1 2 



2 9 



5 

 







13 



mgs, 3 



10. Blue Stone, with " Rimers," 



or streaks of Coal, 119 



11. Grey Metal Stone, with black 



streaks, 10 



12. Foul Coal, 



13. Black Stone, mixed with Coal, 1 



14. Soft Grey Thill, with streaka 



of Coal, 1 5 



15. Foul Coal, 



16. Soft Grey ThilJ, 5 



8^ 



Fms. Ft. In. 



Brought forward, 24 3 6 



17. Grey Post, 10 



18. Grey Post, mixed with Blue 



Stone, 2 6 



19. Blue Metal Stone, 10 



20. Black Stone, with streaks of 



Coal from ^ inch to 2 inches 



21 



mixed with 



thick, 



Black Stone 



Coal, 



22. Soft Grey Post, mixed with 

 Whin, 



23. Strong Grey Post, mixed 

 with Whin and Grey Metal 

 Stone, 6 



24. Soft Grey Metal Stone, with 

 " Bolses," or nodules of 

 Coal, 



Great, or 9-Feet Seam, 

 consisting of — 



25. Coal, 15 4 



26. Black Stone, mix- 



ed with Coal, ... 1 6 

 Bottom Coal, 16 



1 6 



2 6 



3 



2 



5 4 



27 



28, 



Carried forward.... 24 3 6 



2 2 4 



Soft dark Grey Thill, with 



nodules of Ironstone, 12 6 



29. Soft Black Stone, 1 



30. Soft Grey Thill, mixed with 

 Post and nodules of Iron- 

 stone, 2 



'/■ 



'■ ^ 



Carried forward 42 1 2 



