24' BI.ANFORD . GEOLOGY OF nXgPUR. 



h. Traps and intertrappean beds. — It is unnecessary to enter into 

 any details concerning the traps; as usual, they consist of various 

 kinds of dolerite, varieties of basalt, melaphyr, and anamesite prevail- 

 ing. The distinctions between amygdaloidal and nodular beds are more 

 or less local ; each in turn is found resting upon the other. Anything 

 like a detailed description of the different forms assumed by the rocks 

 of this series locally would be useless, and their general features have 

 been discussed in a previous paper. Memoirs, Geological Survey, 

 Vol. VI, pt. 2. 



The intertrappean beds abound to the west of N^gpur, but no 

 attempt has been made to map them except near the boundary of the 

 igneous rocks in the neighbourhood of the city. To have searched 

 over all the country represented in the accompanying map for these 

 little beds, which frequently do not exceed a few inches in thickness, 

 would have taken far more time than could be devoted to the district, 

 and would have led to no important result. The beds marked on the 

 map may be briefly described, commencing on the north-west. 



The first outcrop to be noticed in this direction is about three miles 



north of Kalmeswar on the little isolated flat-topped hill south of 



Dhapawadd. The trap flow forming the top of 

 DMpawada. 



the hill is nodular and of no great thickness, 



perhaps 30 or 40 feet in the centre of the hill, and 10 to 15 at the 

 sides, the upper surface being of course denuded. Beneath this flow is 

 a bed of argillaceous rock, distinctly altered^ and with a nodular struc- 

 ture above, unaltered below ; it is 4 or 5 feet thick where best seen on 

 the north side of the hill, and abounds in casts of shells [Paludina, 

 Lymnea, Valoata, Phi/sa, &c.), mostly broken. 



No intertrappeans are seen south-east of this hill until the neigh- 

 bourhood of Bokhara is reached. On all the low trap rises between that 

 village and Mahuijhari, a thin band of vesicular cherty rock can be 



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