MAKUM FIELD. 87 



ridge, being eut through by several streams. East of the Namdang 

 their height above the plain is about 1,000 feet. The measures as a 

 whole dip at rather high angles to south-south-east, and consequently- 

 most of the known outcrops are on the northern side of the hills. The 

 dip sometimes, however, is in the reverse direction. 



Coal outcrops. — In a nalla close to the path from Kerimgaon to 



Watto, coal is seen (and has been worked) in 

 Tirap quarries. 



several places, but only at intervals, no con- 

 tinuous section being exposed. Ascending the stream, the first coal seam 

 dips north at 40°, but its thickness is not apparent. A little further up, 

 in an old quarry, we have — 



Ft. In. Ft. In. 

 Grey clunchy shale, seen ... ... ... ... 3 6 



Carbonaceous shale and coal ... ... 8 



Coal, seen ... ... ... ... 6 8 



Dip north at 25°. 



A little higher up is another quarry, but choked up so that only 

 1 foot 6 inches of coal is now visible. A little further still, in a third 

 quarry, the following section is exposed : — 



Ft. In. Ft. In. 



Grey shale, seen ... ... ... ... 2 



Carbonaceous shale ... ... ... ... 6 



Coal, seen ... ... ... ... 3 



Dip north-east at 20°. 



The total thickness of coal exposed in this nalla is about 14 feet. 



In a nalla a little west of the above the following section is seen :— 





Ft. 



In. 



Ft. In. 



Eather soft, yellowish-white sandstone, seen 



,. 



... 



11 



Grey shale 



.. 



... 



1 



Blank 



,, 



... 



11 



Grey shale 



,, 



... 



2 6 



Coal, dipping east 20° north at 5° 



9 









Blank 



5 



0? 





Brownish-grey shale .., 







8 









( 



305 ) 



