32 BALL: GEOLOGY 0¥ THE RAJMEHAL HILLS. 



marked fault that has thrown down a boulder bed, resembling the 

 one seen in the Brahmini. This bed is from twelve to fifteen feet thick. 

 The next rocks seen are highly felspathic argillaceous grits ; these are 

 followed by horizontal beds of somewhat similar character, including 

 thin bands of carbonaceous shale, after which the same boulder bed 

 crops out again. These rocks are, perhaps, separable into Talchirs and 

 Barakars. Further on, the bed of the river is occupied by peculiar ferru- 

 ginous grits. 



These rocks are suddenly cut out by a fault which accompanies a 

 trap-dyke ; beyond which the rocks are of ordinary Barakar type. In 

 the river bend east of Dhankoti, there are carbonaceous shales with 

 coaly layers, with which there is a ferruginous grit similar to those seen 

 before. Further on, the same rocks are again seen inter-bedded with 

 Barakar sandstones. None of the exposed parts of the section give 

 promise of workable coal. In the locality first mentioned, a thickness of 

 from eight inches to one foot only could be obtained. Some attempt 

 appears to have been made to open out this small seam. 



Near Ghachoura the river passes into the gneiss, and the Barakars 

 Am ki tr a - are no ^ a g am seen un til the Amgachi stream is 



tl0n- reached, in which there is a succession of sand- 



stones and carbonaceous shales with coaly layers, but no good coal. In 

 other respects there is but little interest in connection with the section. 

 The main branch of the river also exposes some similar Barakar beds 

 until it meets the Talchirs already described on p. 212. In its further 

 course it alternately encroaches on the gneiss and the Talchirs. 



East of the Dubrajpur range there are several areas of Barakar 

 rocks which have been laid bare by the denudation of the trap. 



The principal of these areas is that in which the village and bun- 

 Vicinity of Gopikan- & alow of Gopikandar are situated. This is tra- 

 dar * versed by a stream in which, between the bunga- 



low and Jotichapur, there are numerous outcrops of carbouaceous shale 



( J*e ; 



