HISLOP AND HUNTER NAGPUR. 451 



and granite in this neighbourhood which invests the geology of 

 Nagpur with special importance, and which, when investigated by 

 competent observers, may shed a flood of light some future day upon 

 Indian geology in general. 



Trap Rocks of the District. — The greater part of the trap within 

 our area lies in the west in the shape of a parallelogram, one of whose 

 corners has been encroached on by a projecting portion of Berar and 

 the Betul district of the Sagar and Narbadda territories. Its greatest 

 length is 1 20 miles, and its breadth is from fifty to sixty. Its south- 

 western side, on which the irregularity of figure is found, and by 

 which it joins on to the great sheet of basalt in the Dakhan, is formed 

 by the Wardha. Its south-eastern side, commencing from Suit on 

 that river, crosses the road from Nagpur to Chanda on the south of 

 Chikni, and, passing by the north of the Mangali fossiliferous quarry, 

 extends to Sakra and Bhiwakund, after which it coincides very nearly 

 with the political division between the Subas (provinces) of Nagpur 

 and Chanda, which stretches by Linga, Jamgaum, and A'lasur Hills 

 to the north-west of Bhisi. Here begins its north-east side, which 

 skirts the small patches of sandstone on the west of Umret and Kuhi, 

 and, running close by the city of Nagpur, meets with an eruption of 

 granite, and then touches the sandstone basin of the Kanhan and 

 Kolar, after which it again encounters plutonic rocks on its passage 

 up the right bank of the Kanhan to Dewagac?. At this ancient Gond 

 fortress, the upland tract of Multai, which constitutes the north-west 

 side, joins that last described, and completes the parallelogram. 



In addition to this, the main body of trap within our area, and 

 connected with it, there is a smaller development of the same forma- 

 tion in the north. Stretching south and east from Dewagac/, it fills 

 up the space between the Kanhan and the Pech, and, sweeping- 

 westward round the granite at Chindwac/a, and eastward by way of 

 the summit of Kurai Ghat to Siwani and Chapara, it merges, along 

 with the Mathur range of hills, in the basaltic district that extends 

 to the Narbadda at Jabbalpur. 



The above is, I believe, all the overlying trap within our area, 

 with the exception of one or two isolated portions south-east from 

 Suit, near Waroda and the confluence of the Pain Ganga with the 

 Wardha. 



Granitic and schistose rocks. — The plutonic and metamorphic 

 formation, the extent of which I shall now briefly indicate, lies chiefly 

 in the eastern portion of our area. It is intersected by the Wein 

 Ganga for the greater part of its course. The tract on the left bank 

 of the river I have had little opportunity of exploring ; but, from the 

 cursory examination I have given it, I have reason to believe that 

 granite and its allied rocks are there very largely developed, being 

 only occasionally diversified by patches of sandstone and variegated 

 shales, among which red shales predominate. On the right bank of 

 the Wein Ganga, in the district near its junction with the Wardha, 

 the extent of the formation is not so great. It is observed princi- 

 pally in the channel of the Wein Ganga, though it may also be traced 

 around the bases of the sandstone chains of hills, which it has been 



