DAMUDA SERIES. 29 



The change of strike of the Damudas in the Pugo, to south-east 



or thereabouts,, soon brings the Damuda-Daling 



boundary to the edge of the Terai, and for several 



miles east of the Chel the latter rocks extend to the very foot of the 



hills. 



The next point at which I caught the coal-bearing rocks was in 

 the Mo-chu,* at the mouth of the Ruka naddi, where, however, only the 

 highest beds just below the Dalings are exposed, dipping north-east 

 at 60°. They include coarse and fine sandstones, shaly and slaty beds, 

 and two or three coal-seams of a foot thick and less. Lower down 

 stream the older rocks are entirely obscured by recent deposits, and the 

 extension of the Damudas between the Neora and the Mo is merely, 

 conjectural. 



In the Ma-chu some beds, including carbonaceous layers, are 



obscurely seen close to, and, unless faulted against, 

 Ma-clau. 



underlying strata which I have referred to the 



Baxa series. I took these to be Damuda at the time, but as there are 



some bands of carbonaceous schist included in the Baxa rocks near Baxa 



itself, the above point, which I shall refer to again, is very doubtful. 



No rocks identifiable as Damudas were met beyond the Jaldoka, and 

 they cannot be considered to have been satisfactorily traced further than 

 the Chel. 



It will be seen from the preceding details that there are no beds in the 

 Darjiling district corresponding in any degree with 



Darjiling Damudas re- 

 present the Raniganj the ' ironstone shale ' or middle group of the Damu- 

 group.(?) 



das in the Raniganj field, and the question arises 

 whether it is feasible to correlate our rocks with the Raniganj or with the 

 Barakar group. It is possible that both are present ; as their separation, 

 after the alteration the rocks have undergone, a^nd without the intervening 



* Chu is the Tibetan word for riyer. 



( 29 ) 



