DAMUDA SERIES : IRONSTONES. 61 



anxious to study it has a good opportunity afForded him. The thickness 

 visible is 680 feet, made up as follows :— 



Ft. In. 



1. At top slightly carbonaceous siliceous shales, concrctionaiy, becoming 



more argillaceons as we descend in the section, and commeucing to 



contain ironstones. ... ... ... ... 424 



The dip increases fi-om an angle of' 37° to 50° and then decreases. 



2. River bends, and then shows a further thickness in descending 



oi-der ... ... ... ... ... 250 



Dip 28°-30°. 

 The rocks are then obscure^ and some way down they are~cut off by the 

 fault referred to in the description of the Barakar group, and along 

 >yhich springs break out. 



North-east of Bussutpoor Ironstones are observed, dipping south- 

 south-east. The cross-fault which I have put in cuts off the east and 

 west one ; it is not clear ; and how it ends to the south is a point 

 which I could not satisfactorily determine. 



The Ironstones everywhere seem to be faulted, and I was about to 

 add, are more faulted than the Barakars. This, of course, is not the case ; 

 for the throws affecting the upper beds will affect the lower ( I speak 

 of regular throws, that is, faults passing down deep, no matter what 

 the amount of shift may be) ; but faults are so much more easily 

 recognised where the Barakars and Ironstones come into contact, than 

 where they are confined to one series, as fully to account for the 

 apparently greater number of faulted boundaries of the middle group. 



In the Hoharoo the typical section of the Ironstones occurs. They 

 are much flexured, and exhibit a variety of dips, in direction and amount. 



South of Goomea the Ironstones which occur are not so typical 

 of the group. They are deficient in carbonaceous colouring matter, 

 and the Ironstones are more arenaceous than usual, and do not form 

 the main body of the group, as in those places where it is more 

 characteristically developed. The out-crops of the beds near Khood- 

 gudda exhibit a very distinct curvature, and their edges can be walked 

 upon. Nearly south of Goomea, the strata are cut off by a small fault. 



(99) 



