376 MR. E. W, BINNEY ON CARBONIFEROUS, PERMIAN, AND 



An Account of the Strata in Croft Pit [continued). 



Description op Strata. 



Thickness 

 of each 

 Stratum. 



Middle 

 Coal- 

 measures, 



No. 



Brought forward 



' 19. Blue argillaceous schistus, speckled with 

 coal 



20. Red soapy slate 



21. Black slate, with a small appearance of coal 



under it 



22. Ash-coloured, friable, argillaceous schistus 



23. Purple-coloured slate, striated with free- 



stone 



24. The same, and under it black slate ; the 



thickness of each not distinguished . . 



25. Coal, ist 



26. Soft whitish freestone 



27. Blackish slate, a little inclined to brown .. 



28. Coal, 2nd 



29. Blackish slate, intermixed with coal 



30. Whitish freestone 



3 1. Strong bluish slate, mixed with grey free 



stone 



32. White ironstone 



3 3 . Freestone, striated with blue slate 



34. White freestone, striated with slate in thin 



layers 



35. Dark-blue slate 



36. Coal, 3rd 



37. Dark grey shale 



38. Coal, 4th, with a mixture of slate about 



one inch thick 



39. G-rey freestone, mixed with ironstone 



40. Hard white freestone 



41. Coal, 5th 



42. Shale, mixed with freestone 



43 . Olive-coloured slate, adhering to black slate, 



superincumbent on coal 



44. Coal, 6th 



45. Black shale, mixed with freestone 



46. White freestone, mixed with slate 



47. Dark-blue slate 



48. Coal, 7th 



49. Black shale, mixed with freestone 



50. Strong white freestone 



51. Brown ironstone 



52. Dark-grey slate 



53. Dark-grey shale, with an intermixture of 



Coal, 8th, about 5 inches thick 



54. Light-coloured slate, mixed with freestone 



5 5 . Blue slate, striated with freestone 



56. Strong white freestone, a little tinged with 



ft. 



173 



o 

 13 



I 



4 



23 



4 

 I 



10 



4 



I 

 2 

 8 



3 

 I 

 I 



9 

 13 



o 



15 



2 o 



8 o 



15 6 



I o 



8 o 



22 

 I 



7 

 6 



3 

 6 



5 



5 

 10 



m. 



o 



9 



o 



o 

 6 



o 

 o 



2 

 II 



10 



6 

 6 



o 

 o 



iron 



Carried forward 



417 



