48 mallet: coal-fields op the naga hills. 



Dip, east-20°-south at 60°. As in many other cases, the grey shale is 

 altered at the surface into a tenacious blue clay. 



Close to the last seam, and about 70 feet (strati graphically) below 

 it, Mr. Greig found another which has the following section : — 







Ft. 



In. 



Ft. 



In. 





I. Grey shale, seen 



... 





2 



6 





h. Coal 



1 



1 









^ Brown shale 







4 









j. < Grey shale 







3 









(^ Brown shale 







1 









rCoal 



1 



5 







i. 



-? Brown shale 







1 









(^Coal ... ... ... 



2 



1 









/* Brownish-grey shale 







2 







h. 



3 Grey shale ... 







6 









(^ Brownish-grey shale ... .... 







2 







9- 



Carbonaceous shale with layers of coal 







9 







/• 



Brownish-grey shale 



... 



... 







3 



e. 



Soft, fine-grained grey sandstone 



... 



... 







6 



a. 



Grey, arenaceous, clunchy shale, seen 



... 



... 



9 









Coal in seam 



4 



7 









Carbonaceous shale 







9 









Shale 



1 



7 







Total thickness of seam .. . ... ... 6 11 



Dip east-20°-south at 60°. The coal, at the outcrop, is very brittle, being 

 cut up by jointing in two directions and by lamination planes ; it con- 

 tains nodules of pyrites. 



The same seam was also exposed at 20 yards distance from the 

 above — 



I. Grey shale, seen 



J Carbonaceous shale 

 ^'[coal 



r Brown shale .. 

 •'■ IGrey shale ... 



C Coal 

 i. ) Brown shale... 



(^ Coal 



( 316 ) 



I't. In. 



Ft. In. 





4 



2 





1 4 





1 





10 





2 2 





5 





10 





