Records of the Geological Survey of India. 
[VOL. XI. 
and in tlie second place by myselfd It seems to me unnecessary tliereforo 
to repeat them in a special paragraph, the purpose of this paf)er being satisfied 
if I allude to them incidentally while describing the distribution of the group. 
The most northerly rocks are those which form the extension southward of 
the Karathi area, the description of which in the Memoir of the Wardha valley 
ended at the arbitrary boundary of 19° 30' north latitude. 
The bottom coarse-grained, porous and friable sandstones are very well ex¬ 
posed in the river flowing past Merpali in the direction of Sirpiir, and along 
the west boundary generally they are clearly seen. They rest upon Vindhyans 
as far south as Chitakiinta. 
The upper rocks, consisting of fine-gmined, compact sandstones; granular, 
brown, ferruginous sandstones ; and coarse, white and grey, felspathie sand.stones, 
constitute high land noi-th and south of the Merpali river. They are gradually 
overlapped by the Kota-Maloris as they extend southward, and where the bound¬ 
ary turns to the west, there is a great decrease in the thickness exposed. A 
moderately fair section of the Kiimthis is seen in the Jangaon river, and near 
Dabagur there is a thin bed of slightly carbonaceous shale. It is so very rare to 
meet with anything at aU approaching carbonaceous shale in the Kamthis, that 
I notice its occuiTenco in the present instance as being an unusual circumstance. 
Above Dabdgur, towards Rajur, there are some red clays associated with the sand¬ 
stones, and this gives some ground for suggesting that the determination of these 
as Kamthis is incorrect; and that they ought to bo placed amongst the Kota- 
Mal6ris. Red clays are certainly very common amongst the Kota-Maleris, 
and especially so in the Jangaon valley, but the sandstones with which the 
red clays in question occur, ai*e not of the Kota-Maleri type, but resemble closely 
some of the sandstones of the lower series of the Kamthis. South of the 
Jangaon river the Kamthis appear in their greatest force and stretch for 50 
continuous miles from Ohirakunt to the banks of the Godavari. All the different 
varieties of sandstones that the group possesses are represented: the compact grits 
bi-caking with a conchoidal fracture, the blotchy sandstones, the fen-uginous 
sandstones, the porous sandstones, &c., The middle and the upper sandstones 
form a good deal of high land. Towards the base of the principal range of hills 
extending from hr6mur to Kansapet compact argillaceous sandstones occur. 
These are very characteristic rocks of the Kamthi gi'oup, but they are by no 
means of such frequent occurrence in the GodSvari area as they are a hundred 
miles further to the north. 
Looking at the map, it will be seen that in the Godavari river above San- 
drapali, I have mar-ked the upper limit of the Kamthi group as being near 
Arcnda. By this assignment, the rocks that Mr. King distinguished as Tarcherla 
sandstones (from a village 12 miles to south-south-w'est of Arenda) are brought 
wdthin the embrace of the Kamthi area. I believe the evidence as to the true 
position of these Tdrcherla sand,stones further to the south is somewhat obscure, 
it being possible indeed to infer that they are lower in the series than the 
Kiimthis. Unless the rendering of the Godavari section, howmver, has boon 
^ Memoirs, Geological Survey of India, Vols. IX and XIII. 
