122 Geological features of Bliootan Dooars. [No. 2, 



(1865), I have now an addition of some interest, Iviz. that in the 

 bed of Deemahnuddee a short "distance west of Buxa, which flows 

 through the sandstones and conglomerates, Assistant Surgeon J. Rich- 

 ardson has since informed me he found the fossil molar of an elephant, 

 probably washed out of the upper beds. 



The absence of the tertiary sandstones at the base of the Himalayas 

 for a distance of over 50 miles is, as remarked by Mr. Medlicott, an 

 anomalous case, and if any remnant be found hereafter, it must be 

 .mall In the deeper gorges of the main rivers such as the Jholdaka, 

 Dahina, and Boro Torsa, they would be the more likely to shew, as 

 they do on the Teesta, if nowhere else, but we only find stratified 

 rocks of the most recent formations with the single exception of a 

 small mass of limestone thrust up at a high angle at Balla. The 

 question arises where are these usual formations, they suddenly 

 disappear east of the Teesta, and as suddenly reappear east of the 

 Torsa in equal force. Are they still below the surface over this 

 area or have they never existed, one of the suppositions brought 

 forward by Mr. Medlicott. If they have ever found a place 

 here to what forces are we to attribute this single instance of total 

 widespread denudation in so long a line of formations. Taking great 

 physical features into consideration, it may be worthy of remark 

 that the country and its rocks under consideration is to the south 

 and east on the edge of a great natural basin of depression that must 

 have been receiving for ages the drainage of the whole of the Eastern 

 Himalayas, and considering its distance from the sea, the neighbour- 

 hood of Kooch Behar is yet one of the lowest in Bengal on the north 

 and east. From Balla there runs in a north-westerly direction a higl 

 ridge, 8 to 10,000 feet, given off from the great Himalayan mass oJ 

 Gyepmochi, and this narrow but high feature runs parallel to the deer 

 transverse valley of the Am Mochu, following in all probability * 

 great fault, and the existence of which is, in a measure, proved by th( 

 sudden termination of the limestone in the direction of its strike at 

 Balla, for in the Dootia nulla on the left bank of the Torsa, I was 

 unable to find any, but metamorphic rocks in its bed ; and if the 

 limestone be continuous, this ravine would cut through the whole of 

 it. I am, therefore, more of opinion that the elevatory force that has 

 raised the' tertiary sandstones into the position they are found along 



