48 BALL : GEOLOGY OF THE RAJMEHAL HILLS. 



considered by Mr. Blanford (MSS.) to have so strong- a resemblance 

 to some in the vicinity of Lohundia and Kamzanpiir in the north of the 

 area, that he suggested as a possibility that the latter should be referred 

 to the same group ; but he added that the resemblance may only be 

 accidental. 



In the valley of the Brahmini, to the south of the river, except to 

 the east of Hurinsingha, there is no case of trap resting immediately on 

 Damudas. But north of the river, and also to east of Hurinsingha, 

 Evidence of denuda- there are several marked cases which serve to 

 tl011, afford conclusive evidence of the pre-trappean denu- 



dation of the Dubrajpur group. In point of fact, a reference to the 

 map, in which it will be observed that there are large spreads of trap 

 resting, at a low level,, on the Damuda rocks near Domunpur, Sursobad, 

 Jhikra and Dhumnapahari, sufficiently shews the strong evidence which 

 there is in favor of the view that the Brahmini is only re-scooping a 

 valley which must have existed before the first flows of molten trap 

 found their way into this part of the country. 



A Hurinsingha, a gorge in which coal occurs, is bounded on 



either side by the termination of small ranges. 

 Section at Hurinsingha. - 



To the east, trap resting on the coal-measures forms 



the range, while on the west, the range, of about equal elevation, is formed 



towards its top, of the Dubrajpur beds. Of course the full force of this 



section depends upon whether there is fault or not; but the fact 



that the trap here rests on the coal-measures is certain, and, taken with 



the instances above given, may be accepted as affording complete evidence 



of the denudation. 



At the eastern end of the valley where the river enters the general 

 trappean area, none of the Dubrajpur beds intervene between the trap 

 and the Damudas. 



On the north of the valley a narrow margin of the Dubrajpur beds 

 first appears underlying the trap near Jaladuba north of Hurinsingha j 

 thence it extends continuously northwards. 



( 202 ) 



