GEOLOGICAL NOTES ON ASSAM. 47 



maigoojoo section. The most probable assumption is tliat the former are 

 an expansion of the latter. The ridg-e of the Burrail is of massive sand- 

 stones of same type as those at Goomaigoojoo. In passing through this 

 range, along the gorge of the Jatinga, one gets a good idea of the 

 immense aggregate thickness of the rocks. The section seems to 

 be an ascending one throughout. The dips are veiy high, and there 

 is much local irregularity in direction, but the greatly prevailing under- 

 lie, both in the rocks of the longitudinal valley and of the rano-e is 

 from the table-land area.. I speak of the dip in this special way, be- 

 cause there is here a very marked change in the direction of the table- 

 land boundary, of the Burrail range, and of the strike of the rocks in 

 which change all three agree in a remarkable manner ; it is a point of 

 special interest in the discussion of the phenomena of disturbance. Over 

 Asaloo the Burrail range has a steady north-easterly direction. North 

 of Cachar the diminution of the range being still inconsiderable 

 the direction is steady westwards, thus making a bend of 45°. The 

 feature I have described along the inner base of the range, a system of 

 longitudinal valleys — exhibits this curve most completely. The Jatino-a 

 which flows southward through the range at the bend, bifurcates up- 

 wards on the north side into one of these valleys, the regular crescent shape 

 of which is surprising when one considers the rough process by which 

 its formation was determined ; or, to speak more truly, this reo-ularitv 

 bespeaks the quietness with which this process was conducted. The 

 position of the transverse gorge is no doubt suggestive of a through 

 break in the range ; some such line of weakness did most likely exist 

 but the very tortuous course of the river forbids the supposition 

 that there was any thing that could be called a fissui*e. The whole 



featm-e is rather indicative of bygone conditions of the sm-face that 



the primordial water-shed from which the actual drainage system was 

 developed, was to the north of what is now the culminatiuo* line of 

 elevation, and apparently on or about the axis of flexure. It would be 



(433) 



