194 NERBUDDA DISTRICT. 



detected some evidence of the real state of the case, sufficient to prove 



that the igneous is more recent than the super-incumbent aqueous rock. 



The Doondi river near the village of Pertulla (see map) exposes a sec- 



T , .„ tion illustrative of such a case. The lower spurs 



In hill spurs near A 



Buddi. of the range of which Buddi peak is the culminating 



point present, in many places, pseudo-interstratification of the sandstone 

 and basalt. One may ascend from sandstone to trap, and on to sand- 

 stone again, but in every case examined, the gorges between these spurs 

 show that the basalt is not in reality continuous, but that at some dis- 

 tance away from the place first examined, the ascent might have been 



made on sandstone only. In the bank of the 

 In Pertulla section. . 



Doondi river near Pertulla, a sandstone bed at the 



base of one of the low hills, may be seen resting on trap, on which it lies 

 quite, or nearly, horizontally. When its lower surface is examined, no 

 mineralogical alteration can be detected, such as might be expected to 

 result from the bed having been lifted up by a mass of melted rock in a 

 viscous or fluid state. The narrow band of discolored stone at the junc- 

 tion is in no way different from what may be seen between almost any 

 two beds of sandstone ; and it is very difficult to escape the conviction that 

 here the sandstone must have been deposited on the consolidated basalt. 



But this was not the case ; the trap is really intru- 

 Trap really intrusive. . . . 



sive, the upper bed has yielded a little farther on, to 



the pressure from below, and the stream now exposes the place where the 



igneous rock rushed up through a crack in the upper bed, and flowed 



over it. 



The bed was here much broken up, and many fragments of it 

 enclosed in the trap ; the whole is now well exposed, and the conti- 

 nuity from the place where the basalt underlies, to where it breaks 



Mineral alteration of U P the overlying sandstone bed clearly seen. We 

 the sandstone. can a ] so see fast where the mechanical violence 



exercised by the trap has been greatest, there also has its. die- 



