OLDHAM : GEOLOGY OF MANIPUR AND NAGA HILLS. 13 



to Mao, we have, east of this line, a series of comparatively straight- 

 crested spurs with rounded summits stretching eastwards at a height of 

 four to five thousand feet till they drop into the valley of the Zullo, 

 while to the west the spurs suddenly rise to some 7,000 feet whence 

 sharp crested ridges run towards the west till they unite and culminate 

 in the peak of Japvo at a height of 9,872 feet above the sea ; thus we 

 must limit the catchment areas of any glaciers which may have existed 

 in these valleys to the comparatively small drainage to the west of the 

 upper tertiary boundary. 



29. Extending up the Mizir valley for about a mile beyond the line 

 Deposit in the Mizir ^ a ^ down in the last paragraph and ending abruptly 

 vaUe y* in its vicinity, is a roughly triangular patch of 



gently and evenly sloping ground, through which the stream has cut a 

 channel about 200 feet deep with steep and regularly sloping sides, on 

 which is exposed a section of boulders, generally sub-angular, mixed with 

 debris of every degree of fineness ; as far as texture goes, it is just such 

 a collection as might naturally be called a morraine ; and if, as described 

 by Major Godwin-Austen, the deposit really did come to an end just op- 

 posite Kigwema at a distance of four miles from its source, it is not impos- 

 sible that a glacier flowing from a catchment area of about three square 

 miles at most could have formed it. 



3U. But though this particular patch ends abruptly opposite Kigwema 



as correctly described, it is by no means the ori- 

 Further extension. . , . 



gmal limit of the deposit, whose further extension 



I will endeavour to describe with the assistance of the map. To the 



north of the villages of Kigwema and Mima, there is a long straight valley 



at the bottom of which is a broad gently sloping floor of from a quarter to 



half a mile in width, extending right up to the extreme head of the valley 



whence there is a sudden drop into the Mizir valley. This surface, which 



slopes about 200 feet per mile, would, if continued, coincide with that of 



the first-mentioned terrace at the head of the Mizir valley ; and if any 



further proof of the original continuity of the two is required, it can be 



found in the small terraces which are to be seen under Kigwema, and 



