50 king: coastal region of the godavari district. 



superincumbent trap do not appear to be altered at all ; and the first 

 idea that strikes one is that for which Hislop contends, namely, that 

 the alteration must have been produced by the underlying trap, or 

 (to put it more correctly) this is the view Hislop takes of the situation 

 near Nagpur, and he indirectly extends it to the Rajahmundry area, 

 though it must be remembered that he never saw the latter. 



A very important point here is, that if the traps between the 

 Case against altera- infratrappean beds and the intertrappean zone 

 tl0n « were intruded, they might be expected to have 



altered the contact beds equally above and below ; but there is no more 

 sign of their having altered the subjacent beds than there is of the upper- 

 most trap having altered the fossiliferous layers on which it was poured. 

 Again, it seems to me that any direct alteration by the traps may 

 Influence of weather- nave Deen completely obliterated by weathering, 

 m %- and this would account for the unaltered look 



of the infratrappeans, and of the upper portion of the intertrappean 

 limestones. 



The real facts of the case appear to me to be, that the condition of 

 alteration from below upwards is only apparent, and due nearly altogether 

 to the varied constitution of the beds, while the metamorphic action of 

 the superincumbent traps was not very strong. The general constitu- 

 tion of the beds in the fossiliferous outcrop at 

 Explanation. ,,.,,•,, i i i i , 



Kateru is, that the lower beds are more purely 



calcareous, while the upper beds are less and less pure, or are more and 

 more clayey, until in the topmost beds they are calcareous muds. In the 

 Pungadi outcrop the clayey bands are rarer, and there is, as far as I could 

 see, no representative of the muddier beds; and as a consequence, the 

 alteration or the degree of crystallization is more persistent throughout 

 the whole thickness, there being still, however, a more purely calcareous 

 constitution in the lower beds. At the same time, throughout the two 

 outcrops, there is a good deal of tailing in of the limestone beds among 

 the more clayey ones, and thus, at places, we find the crystalline character 

 waving irregularly up and down the series. 

 ( 214 ) 



