GEOLOGY OF CENTRAL INDIA. 



47 



except the margin of one of the valves remains, and I can only state the 

 following particulars ; viz. that it belonged to an apparently nearly equi- 

 lateral bivalve of a roundish form, about three inches and a half in width. 

 That this bivalve was convex, inclining to flat, and that it was longitudi- 

 nally rayed, the rays being convex, broadish, and striated longitudinally. 

 The hinge portion of this shell M'^as wanting. It appears to have had 

 considerable thickness and strength, and in all probability belonged to a 

 variety of Pecten. The number of rays could not be correctly ascertained : 

 their breadth was about two-eighths of an inch. 



The above is all the information which I can give relative to the 

 organic remains of these limestones, as I have, as yet, met with none 

 other, except, indeed, the impression of what every one who saw it, be- 

 lieved to have been that of a small flattish fish. It was about three inches 

 in length, audits broadest portion was about one inch and a half. Though 

 the resemblance was certainly striking, so many characteristics were want- 

 ing, that I mention it merely in this hurried way. I was rather myself in- 

 clined to consider it as the impression of one of those polymorphous bodies 

 before described, and which assume a great variety of shapes and forms. 



The above limestones do not appear to contain any metallic veins, 

 or, indeed, many mineral veins of any kind. I have met with veins of 

 calcareous spar in some of them, more especially in the brownish black 

 variety before alluded to, but even this is rare. The general structure of 

 the rock is that of a uniform fine grained argillaceous limestone, the sur- 

 face of which, in many instances, exhibits a deudritical appearancet and the 

 quarries of this rock have, in the distance, a zotied aspect. 



The absence of metalliferous and mineral veins, kc. and of the 

 caverns and fissures which generally characterize the mountain limestone, 



