156 Notes on the Geology and Physical features, dx. [No. 3, 



The third line can be taken up at the base of the hills near 

 Jaintiapur, by the river Rangpani, into the Umchaliang, S. W. to 

 N. E., crossing the Mantadu, on again to the Lama river, past Tham- 

 pianai Gr. T. S., into the Pamesken, and by a succession of ravines to 

 the north-west of Khleriat, where the last stream, the Shashem, turns 

 to the S. S. E. The same run, but with a more east and west course, 

 is taken up in succession on the north by the Muntang and Munriang 

 rivers, tributaries of the Kopili, and lastly by the Mankhen. 



These great lines of continuous depression are again displayed 

 further on the south and east and shew there a decided curvature. 

 I may note the Lubah, Simleng and Artan into the head waters of 

 the Kopili, north of Sherfaisip, and again further south the deep 

 depression marked by the valleys of the Kumra Larang, Kayeng into 

 the Jatinga and, taken upon the north of the main watershed at 

 Asalu, by the valley of the Dhansiri. To the south of this the strata 

 are found tilted high in that direction giving the more pointed shape 

 to the peaks of the south-west Burail range. The line is intimately 

 connected with the original elevation of the whole mountain mass, and 

 the parallel continuous lines, already noticed, are doubtless due to the 

 same parallel forces of elevation. As might be expected the geo- 

 logical formations all coincide with these great natural flexures, 

 carrying the nummulitic series with its limestones, and the cretaceous 

 rocks, far north on the Kopili, and thus into the valley of Assam. 



Camp, North Cachar, December, 18G8. 



