HISLOP AND HUNTER NAGPUR. 353 



the great granitic tract, which stretches from Nagpur to the Lanji 

 Hills, while its south-western boundary is constituted by the trap, 

 surrounded by which two of its detached portions are found at Kut- 

 kheiri and Chorkheiri, near the source of the Kolar. Were we to 

 follow the direction of these outhers, they would lead us to the sand- 

 stone hills beyond our area, that skirt the southern side of the trap 

 chain of Gawilgarf, north of Elichpur. But if we suppose the sand- 

 stone continued north-west in the line of the Kanhan's course, we 

 arrive, after crossing some miles of trap and granite, at the beds of 

 carbonaceous and clayey shales, which, running under the trap-range 

 of Mathur, appear on the north side, and form the base of the lofty 

 development of sandstone at the Mahadewas. The largest body of 

 this formation, however, lies to the S. in the basin of the Wardha 

 and Pranhita, extending, with only a few slight intrusions of plutonic 

 rocks at Segaum and the north-west of Chanda, and some outliers 

 of trap indicated on the map, from the termination of the basaltic 

 effusion at Jamgaum Hill and Suit, south-west into the Nizam's 

 country by Kota, until within a short distance of Badrachellam. 



A very marked feature in the geology of the country between the 

 Iri and the Wein Ganga is tiie occurrence of ranges of sandstone- 

 hills, running for the most part north and south, corresponding in 

 general direction with ranges of the same formation in the district of 

 Kota, described by Dr. Bell *. These hills, where they have fallen 

 under my observation, rise from plains of plutonic rocks, by which 

 the strata have been indurated and elevated, though still retaining 

 their horizontal position. Such are the flat-topped chain which 

 stretches on the east of Segaum, and that which terminates in the 

 castle-like blufF of Perzagao?. On either side of the Wein Ganga we 

 meet with some isolated remnants of the sandstone formation. One 

 of these, but very limited in its dimensions, lies on the banks of the 

 Selari, a small stream which joins the Wein Ganga near the town of 

 Pawani. Another farther down the river extends for some distance, 

 first on the right bank and then on the left. In the district on the 

 east of the Wein Ganga, a little sandstone proper is met with at Koka 

 to the north-east of Bandara, and on the banks of the Wag River 

 near Ambgaum, and on the east side of the Nawagaum Lake, from 

 which it extends south as far as Mahagaum ; while on the west of 

 the lake there is an abundance of shale, which is also seen to cross 

 the road from Nagpur to Rayepur at Mundipar Ghat and Jamnapur 

 near Sakorali. These argillaceous strata, which are r^d, green, and 

 as partly at Mundipar even white, seem to be the same as the fossi- 

 liferous laminated clays at Korhadi. In addition to the dolomitic 

 strata at Korhadi mentioned above, there are eminences of the same 

 crystalline limestone running eastward among plutonic rocks from 

 the Pech, on the west bank of which river higher up there is a small 

 patch found along with a little outcrop of sandstone at Dudhgaum, 

 surrounded by trap. 



Laterite, ^c. — In various parts of our area we meet with beds of 

 laterite, covering the rocks already described. I have not found it 

 * Quart. Jouni. Geol. Soc. vol. viii. p. 230. 



VOL. XI. PART 1. 2 B 



