24 
Records of the. Geological Survey of India. 
[VOL. V. 
some of the rocks seen near Amravaram. Their appearance, however, does not support this 
view, but it should be added that they are very poorly seen, and that there was but little 
time for their examination. 
The sandstone south-east of this, along the north-east boundary of the sandstone area, 
Rocks near north-east boundary, presents few points of interest. As a rule, the rocks, except 
south-east of RajgoM. where they rise into hills, which is not often the case, are 
greatly concealed by sandy clay, forming a semi-alluvial plain. The hills, so far as they were 
examined, are of the usual grit and conglomerate, which form so large a proportion of the 
field. The boundary is but an approximation laid down by a very cursory survey, and 
closer examination will doubtless induce its modification. In only one place was anjf rock 
seen which had a distinctly Barakar character. This lies south of the village of Bedanol, 
nearly due east of Xshraopetta, in a stream, and even in this case the rock was only white 
felspathic grit, unaccompanied by shale or any other typical Damuda formation, 
Leaving the eastern or north-east boundary for the present and returning to Raigudem, 
Rocks near north boundary between ^ lew wolds will suffice to describe the rocks near the 
Riugidem and Dantalbord. northern boundary of the sandstone area. The rocks to the 
west and south-west of Raigudem are the usual sandstones, grits aud conglomerates, more or 
less ferruginous and possess no distinctive character. To the south stretching away to 
Pagalapali and Mulkalapali is a great sandy plain of jungle in which very little rock occurs. 
Scarcely any rock too is seen in the Kinarswami stream. 
North-west of Dantalbora there is a considerable tract occupied by Talohirs. They 
do not run along the boundary of the sandstones, and it is 
impossible to say whether they extend as far as the boundary, 
or whether they are separated everywhere by a belt of metamorphics, as no rocks whatever 
are seen near the Kenarswami stream about Dantalbora. Metamorphio rocks are, however, 
well seen at Gadrfigfidanpali, at Koigiidem north of Sompali, and north of Sangam, and 
they occur in the Kinarswami or rather in its tributary called the Morair, south of Sangam, 
so that they probably surround the Talchir area in the manner represented on the map. The 
Talchir beds consist chiefly of the usual shales (mudstones), hut just north of Gadragudanpali 
some very fine compact sandstone is met with, which has been quarried to some extent 
for the anicut at Dumagudem. The northern boundary of the patch of Talchfrs is obscure, 
the country being much covered by sandy alluvium. 
The mode of occurrence of the Talchfrs not only in this instance, hut also on the outside 
Unconformity of DaunidaB and oi ' the sandstones elsewhere, as on the Tal, at Dumagudem' 
KiXmthis on TAlchirs. around Narsapur, and again on the Ganar stream, and their 
want of connection in all these instances with the Damddas, point to an unusual degree of 
unconformity between the two groups. In the present instance, the higher sandstone beds 
near Dantalbora are believed to he Kamtlus, hut on the Ganar stream Damudas occur, and 
there is the same absence of Talchfrs at the base of the plant-bearing seiies, and their 
presence in an isolated area outside the boundary. 
The range of hills forming the boundary of the sandstones from Paliinclia to Sitarampur 
„ „ ,, fort consists mainly of grit. On the hill fort of Sitarampur, 
North boundary near Paluncha. J r 3 
forming their eastern extremity, some fine red and yellow 
compact shale of unmistakeablv Karuthf character occurs. It is not clear whether the 
boundary here is a fault or not, hut apparently it is natural. The beds dip south close to the 
boundary, but north on the hill forming the old fort. 
