OF WESTERN AND CENTRAL INDIA. 17 



take too much time ; they are by no means sufficient to prove more than 

 local disturbance. I would suggest that the anastomozing bands to the 

 right of the sketch, fig. 2, page 157, are the result of infiltration*, as in the 

 similar instance figured by Newbold, (Jour. Roy. As. Soc, Vol. IX, p. 33,) 

 to which Mr. Hislop refers in a note. This also was Nevvbold's view. 

 That the sedimentary beds difier in colour from the subjacent amygdaloidf 

 is scarcely proof that they were not deposited upon it, nor even that 

 they were not composed in part of detritus derived from it. 



Besides the objections pointed out by Mr. Medlicott, there are, I 

 think, several others to the acceptance of Mr. Hislop^s theories. In 

 the first place, the existence of a lake several hundreds of miles in 

 length and breadth, yet so shallow throughout the greater portion 

 of its area that pulmoniferous mollusea (Lymnea, Pliysa) , could inhabit 

 it, appears to me an anomaly. Secondly, Mr. Hislop^s theory does not 

 account for the cases of two or more distinct successive deposits alternating 

 with trap. J If it be argued, as Mr. Hislop appears to do, that these 

 were originally one deposit and were separated by intrusive masses of 

 igneous rock, the reply is that their distinctness of deposition is proved 

 by two successive deposits frequently differing entirely from each other 

 in mineral character. § Above all, how is it that the trap, if intrusive, 



* Since tlie above was written, I have seen the place, and find my suggestion correct. 



t 1. c, p. 155. 



% See Mem. Geol. Surv. Ind., Vol. II, p. 201. 



§ Since the above was written I have received from my colleague, Mr. Fcddeu, the 

 following section of the well known Mekulgundi Ghat south of the Pem Gunga River and 

 formerly described by Malcolmson : — 



1. Trap. 



2. Cherty bed containing Cyprls, Unio, &c. 



3. Trap. 



4. Limestone containing Ci/pris and fragments of small mollusea, 



5. Trap. 



6. Calcareous grit containuag broken shells, 



7. Metamorphic rocks. 



Here not only do the beds successively interstratified with the trap differ in character^ 

 but also to some extent in the fossils contained, the Unio being conliued to JSTo. 2. 



{ 153 ) 



