94 MALLET: COAL-FIELDS OF THE NAGA HILLS. 



Large nodules of impure, rather brittle, grey limestone are not 

 unfrequently met with in the coal measures, and loose pieces are brought 

 down by many of the streams. A specimen from the neighbourhood of 

 Tel Pung yielded on analysis — 



Calcic Carbonate ... ... ... .., ... 38-04 



Magnesic Carbonate ... ... .. .,. 21*75 



Ferrous Carbonate (with some Fe^O 3) .. .. g-QS 



Insoluble (mostly clay) .. ,„ ,, .. 32-00 



100-84 



the rock being an argillaceous dolomitic limestone. Another specimen 

 from the Disai valley gave 53*88 per cent, of insoluble matter. 



Another variety of limestone, which sometimes occurs in layers of 

 a few inches or a foot thick amongst the shales, is of a greyish color and 

 extremely tough. A sample from the 38-feet shales near Tel Pung 

 (p. 23) gave — 



Calcic Carbonate ,,, ,, ... ... 41*80 



Magnesic Carbonate ... ... ... 27*48 



Ferrous Carbonate (with some Fe'O^) ... ... 9-51 



Insoluble (sand and clay) J ... ... ,, 22-00 



100-79 



The coal itself sometimes includes lenticular nodules of limestone, which 



have a brown color on account of the carbonaceous matter they contain, 



but they are often intersected by thin seams of colorless calcspar. 



They seldom exceed a foot in thickness and a yard or two in diameter. 



A sample from the 6' 4" seam of coal in the Tiru nadi (p. 64) yielded 



on analysis — 



Calcic Carbonate ... .. ... .. 76-20 



Magnesic Carbonate .. ... ... ... 15*94 



Ferrous Carbonate .. ... ... ... 1*00 



Carbonaceous matter .. ... ... ... 6-00 



Insoluble incombustible residue ... ,. ... "80 



99-94 

 Some samples of the first variety of stone (the grey limestone), like 

 that of which the analysis is given, would very likely be found to yield a 

 ( 362 ) 



