NERBUDDA DISTRICT. 159 



are, as a whole, unlike the other rocks of the section. They are soft 



and friable and very felspathic ; whereas the others are hard, gritty or 



earthy ; the roof and floor of the coal here are of sandstone, and not as 



in the other rocks, of carbonaceous shale. In this case also, it must be 



remembered, that the supposition of the two coal seams being, in reality, 



parts of a single bed, brought thus twice to the surface by a fault, rests 



on the close resemblance in the character and order of sequence of these 



beds supposed to be repeated, and could not be absolutely proved to be 



the case save by boring. 



As another example of the prevalent characteristics of these Lower 



Damuda rocks in this district a measured section 

 Machna Section, 



is appended of the rocks of the Machna river as 



seen between Shapur and the Tawa. Descending section: dip varvino' 

 from E. to N. E.* 



Thick bedded massive sandstone, (one bed 20 feet thick) a few bands 

 of carbonaceous matter included in this sandstone ; it becomes more thin 

 bedded and more earthy in descending. 

 10 feet in. More thinly bedded brown sandstone. 

 1 „ 3 „ The same, becomes flaky and with imperfect impres- 

 sions of vegetable remains. 

 , Blackish, grey sandy shale, (clunch.) 

 , Flaky shale, blackish. 

 , Sandstone with black partings. 

 , Whitish felspathic soft grit, fine grained. 

 , Black shale, partings of coal in places, in others 



wanting. 

 , Soft grit. 

 , Shaly parting. 



, Sandstone with coarse ferruginous nodules. 

 , Grit. 



1 



s> 



6 







33 



6 







3} 



6 



1 



33 



2 







33 



1 







33 



9 







33 



1 







33 



5 



2 



3} 



6 



* From Mr Oldham's notes. 



