142 



KHASI HILLS. 



crystalline lumps : it is found in all parts of the bed, both near the top 

 and bottom, but chiefly the latter. It is not however very abundant. 

 The accompanying sketch of a part of the coal-bed will show its 

 appearance where the intercalated sandstone is partially seen (Fig. 12). 

 The roof of the coal is a thick bed of whitish clean grit, composed of 

 sharp angular quartz grains, entirely without any perceptible cement. 

 It is occasionally coloured with deep ferruginous stains. 



The whole series of beds is very nearly horizontal, and is sharply 

 Horizontal; worked scarped on its Outcropping edges. The coal 

 by adits . j^^g j^ggn extracted by means of adits driven in 



horizontally on the bed, and the position of the seam has enabled the 

 required drainage of the mines to be effected with very little trouble 

 or expense. The entrances to some of these adits are seen in the 

 accompanying sketch of a portion of the ridge seen from the North, 

 and which also shows the general position of the mines (Fig. 13). 



Tr^.I3. 



