Chap. 10.] w. blanfoud, western india. 59 



is clearly proved by the fact that the sedimentary nummulitic beds rest- 

 ing upon them have also been tilted up, but it is also certain that the 

 traps were inclined before the deposition of the nummulitics, and it is 

 not clear to what cause this inclination should be attributed. Judging" 

 from the horizontality of the same beds throughout Malwa and the Deccan, 

 it appears probable that they were originally horizontal in the Rajpeepla 

 hills also. 



The disturbance and the great number of dykes met with in the 

 Centre of volcanic I^ajpeepla hills appear to indicate that this was, 

 during the trappean times, a great centre of vol- 

 canic action. In further support of this view is the occurrence north 

 of the Nerbudda, at Matepenai or Kulali hill, of a mass of trap of pecuhar 

 structure, which appears to have been the nucleus of a volcano. (See after- 

 wards) . To the same cause may be ascribed the great hardening which 

 the sandstones of the Deva valley have in places undergone, and the 

 dykes and irregular intrusive masses of trap which intersect them. 



Matepenai is by no means the only intrusive mass of trap. Many 

 Intrusive masses ^^^^ occur and several of them like Matepenai are 

 trachytic. ^^ ^ ^^^.y. (j^gerent kind of volcanic rock from the 



usual basaltic lava flows. They are in fact, so far as can be judged by 

 appearance, trachy-dolerites, or in some cases true trachytes. One very 

 considerable mass of a decidedly trachytic rock occurs upon the margin 

 of the nummulitics near Padwani. These more silicious forms of trap 

 are apparently, in all cases, intrusive; all the flows appear to be of 

 dolerite, and the less basic nature of the dykes and volcanic nuclei may 

 be due to their having dissolved more of the quartzose metamorphic rocks, 

 of which they frequently contain semifused fragments. 



One general character of the trap country which was omitted in the 



.. „ , paper already referred to may be mentioned here. 



country. j^ jg ^j^g ygj.y peculiar nature of the vegetation. 



This has been remarked by many previous writers. It is so marked that 



( 221 ) 



