94 



RANIGANJ COAL FIELD. 



f Carbonaceous shale 

 | Coal, inferior 

 J Carbonaceous shale 

 Coal, inferior 

 Carbonaceous shale 

 Coal 



Total thickness of seam ... 

 f Gray arenaceous shale, with fibre-like impres- 

 J sions of plants 

 ' j Coal, sulphurous 

 {. Gray arenaceous shale 



While -Mr. Homfray's section* is 



15. Sandstone 



16. Ditto, very hard ... ... 



( Clunch and clay slate (blue shale) 



17. < Coal 



^ Shale and Blackbats (carbonaceous shale) 



18. Main Coal 

 Fire clay 

 Black shale 



Clunch and slate clay ... 

 Coal 



20. Sandstone 



19 



[Chap. IV. § 4 



Ft. in. 







5 







4 1 







2 







1 10 







2 







2 2 









13 



7 



mpres- 







... 



9 



H 



... 



1 



101 



... 



1 



2 





Ft, 



in. 



... 



28 









4 







... 



21 



5 



... 







3 





7 



2 



... 



8 



10 



... 



4 



8 



... 







4 





4 







... 



1 



6 













There is either error in these various sections, or else they 

 show the Narrainkuri seam and its accompanying shales to be 

 extremely variable, the greatest variation being in the shale over- 

 lying the coal. The whole of the Narrainkuri seam is said to be 

 of inferior quality. 



Across the Raniganj colliery, from East and West, extend two small 

 trap dykes, which are a few feet apart, each being about 3 feet in 

 breadth, and the mine, before 1843, was wrought mainly on the South 

 side of these, between them and the out-crop. From the practice, which 



t>s . ... . then prevailed, of leaving all small coal which 



Raniganj old mine on r ' ° 



fire - it did not pay to raise, in the mine, and in 



consequence of the tendency to spontaneous combustion of the 



* As. Soc. Jour., Vol. XI, page 738. 



