m. 



In. 



2 







15 



0? 



2 







3 







5 



0? 







6 







4 



6 







28 



0? 



1 



2? 



29 



0? 



58 



6? 



38 mallet: coal-fields of the nagX hills. 



Coal ... ... ... 



Blank 



Coal ... ... ... ... 



Blank ..• ... 



Coal ... ... 



Brownish-grey shale ... .. ... 



Coal ... ... ••• 



Blank 



Coal ... ... ... ... 10 0? 



Total visihle thickness of coal 



>» -.» » » shale ... 



Blank .. .. 



Total visible thickness of seam ... 



The 9ft. coal was being quarried in 1874-75. 



In the next nalla to the west, a large quantity of coal is exposed. 

 „. , In two places 8 feet of it is seen, neither top nor 



Between Tirap^ quar- ... 



ries and Leap nadi. bottom visible : dip south-east at 5°. In the next, 



again, coal is also abundant, dipping north at 15." In a nalla which 

 crosses the Watto-Manglang path, I estimated the coal at not less than 

 30 feet, dipping east-SO'-south at 20°. In the Sipri nalla (a little west 

 of the above path) 15 feet of solid coal is exposed in a cliff, neither top 

 nor bottom visible : dip east-10°-south at 40°. Thus a large quantity of 

 coal is visible at the base of the hills in every nalla for more than a 

 mile to the westward of the Tirap quarries. It appears to be on the 

 same horizon throughout, forming one great seam with probably some 

 minor ones also. No good section of the entire seam is anywhere visi- 

 ble but I should estimate the average thickness of coal at not less than 

 25 feet. It is not improbably over 30. The dip is irregular, varying 

 from 5° to 40°. It is mainly to north and north-east near the quarries, 

 changing, further west, to south-east. Most of the coal is of the hard 

 kind.* 



* Firfe, p. 78. 



( 306 ) 



