822 In the bed of the Narbudda Granite. [No. 167. 



I found, however, that this mass was in reality the pinnacle of a sub- 

 stratum of granite, which had there, and in several other places, pierced 

 the trap rock ; and upon attentive examination of the adjacent strata, 

 there appeared a transition from the close, compact and uniform texture 

 of the black trap to the granulated crystals of the granite. That 

 is, the trap gradually assumed a less homogeneous character, sepa- 

 rated into particles slightly blended together, and then into the dis- 

 tinct crystals, characteristic of granite ; one stratum being the common 

 grey kind, another the red, and a third the porphyritic, all forming 

 with the horizon angles exceeding, I think, 75°. It was my intention to 

 have selected and sent specimens of each transition ; but heavy duties, 

 and my subsequent removal from the spot prevented me. Should the 

 Society be curious to see such, I can write to Col. Outram, my succes- 

 sor at Mundlaisir, and beg him to forward specimens. 



The fact seems to me of some interest, if only as exhibiting the 

 thickness of the trap and amygdaloidal strata of Malwa, which may 

 thus be plausibly calculated at 1600 feet. The whole scarp of the 

 Vindhecia, forming the Southern limit of the province of Malwa, 

 exhibits an abruptness which savors of disruption of surface, by the 

 elevation of the table land, or the sudden subsidence of the valley of 

 Nimarr. Yet I have never heard of granite occurring in any portion of 

 the section of strata presented by these precipices. A stricter exami- 

 nation of the strata is perhaps requisite to throw light upon the subject. 



If in all cases of the appearance of granite immediately beneath 

 trap, the two formations blend their distinctive characters on contact, 

 it might, with some shew of reason, be assumed, that both have been in 

 a state of fusion at one and the same time ; and the more complete cry- 

 stallization of the granite might be referred to the greater pressure under 

 which it parted with its caloric. 



