372 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



the same crystalline limestone at Dudhgaum, where it is in the 

 vicinity of trap. To the east of this, at A'mbajiri in Chandpur, it 

 occurs again : but there, as in most of its other localities, the granite 

 rises to the surface in the neighbourhood. Limestone is found also 

 on the Lanji Hills at Kunde and near Bhanpur to the east of Hatta ; 

 but whether it is the limestone associated with sandstone, or just a 

 calcareous phase of our freshwater tertiary formation, from not having 

 visited the spot, I am unable to decide. It seems to be comparatively 

 free from magnesia, in which it differs from the generality of the 

 strata of which we are nov/ treating. From the heat to which these 

 have everywhere in our area been subjected in the process of dolo- 

 mitization, we need not expect to discover in them any organic re- 

 mains. Newbold thought that he had foimd in certain cherty veins of 

 limestone near Karniil myriads of spherical Foraminifera. We have 

 also veins of chert in theKorhadi limestone, which exhibit appearances 

 that might be mistaken for the same objects, but they do not seem 

 to be really organic. The minerals most abundant in the dolomite 

 are tremolite and red and yellow steatite, which last, when the surface 

 of the rock is weathered, stands out in little prominences, as if it 

 were a species of lichen. 



The whole series of strata which we have designated by a, b, c, d 

 we conceive to be only subdivisions of the same formation. They 

 have been disturbed by the same granitic eruptions, and, where fos- 

 siliferous, bear a general resemblance to each other in their organic 

 remains. But this mutual connection is more apparent when we 

 compare the series within our area with strata beyond it. From 

 Mr. Sankey we learn that the sandstone represented in the north- 

 west corner of our map is succeeded in a descending order at Chota 

 Barkoi by bituminous shale with fossils and sandstone, and at Bhuwan, 

 at the foot of the ascent to one of the Mahadewa or Pachmac?i Hills, 

 by indurated green clay-stone and green shale, and bituminous shale 

 with fossils. Again below the sandstone in the south-east corner of 

 the map, as we are informed by Dr. Bell, there occur argillaceous 

 limestone, bituminous shale with fossils, and a few alternating layers 

 of impure limestone and bituminous shale, until we come to a bed, 

 eight feet thick, of laminated sandstone, &c. Situated, as our 

 sandstone is, between these two extreme points, and appearing to 

 be a bond of connection bet\;T'een them, we might a 2)fiori expect 

 that the intermediate beds would be of the same age as those at the 

 localities on either side ; and this opinion is confirmed by the ap- 

 pearance of the sandstone near Nagpur, which shares with the sand- 

 stones of the Mahadewa and Kota hills, the distinguishing feature, 

 first noticed in this neighbourhood, of being pervaded by ferruginous 

 septa. These dark-brown stripes, which in all their hardness pro- 

 trude from the weathered surface of the enclosing rock, will be found, 

 wherever they occur, a very good criterion for judging of the age of 

 the sandstone. But besides identity in the arenaceous beds of our 

 whole district, we can trace the same identity between the subjacent 

 strata at Nagpur, Pachmac?i, and in the Hyderabad country. On 



