NERBUDDA DISTRICT. 



151 



Upper Tawa Vallej\ 



This lower, or Talcheer portion of the series, is very well seen in the 

 glen of the iC upper Tawa," a glen at the head of 

 which the old hill fort of Hurriaghnr stands, and 

 through which the Tawa runs in a westerly direction into the wide 

 open valley in which it meets many of its tributaries and swells to a 

 large river. The green muds and Boulder-bed are there very well seen, 

 as indeed they are all along the south of the Tawa drainage, in the 

 valley of the Machna and in that of the Sooki. The accompanying 

 sketch is taken from this latter valley, looking towards Bowerghur 

 hill ; the flat and slightly undulating foreground is occupied by the green 

 mud and earthy sandstones, which are, at the base of Bowerghur, faulted 

 against the crystalline rock of which that fine block is formed. 



Fig. 4. View of Bowerghur Hill, seen from the valley of the Sooki. 



Thickness of green silt. 



Along this southern drainage of the Tawa these green muds must 

 attain very considerable thickness, but it is very 

 difficult to estimate to what it may amount in a 

 rock so destitute of bedding as the nearly amorphous masses of the Tal- 

 cheer group generally are. Some approach to arrangement, visible in 

 parts of the deposit, (see description of subdivision b above) sometimes 



