SCHISTOSE AREAS. 13 



A couple of miles eastward of the Bairawudi Konda the mica schists 



< Chennampalle quartz- di P under a narlW band ° f quaxtzites (the Chen- 

 ites - nampalle quartzites) separating them from the 



most westerly band of granitoid gneiss which I have above called 

 the Chandra Sekharapuram band. Eastward of this gneiss again lies 

 another set of quartzites which have a westerly dip, and appear to form 

 with the former a synclinal basin, including the granitoid rocks. East 

 of this second quartzite band comes in an extensive series of schistose 

 beds, mainly micaceous, which may reasonably be regarded as the 

 representatives of the great mica schist series forming the base of the 

 Bairawudi Konda. These eastern mica schists occupy a wide valley 



Mica schists of Irur in which lies the villa £ e of Irur (Eroor), after 

 vaUe y* which this valley and the schist series may be 



conveniently called. The surface of the schists is greatly hidden by 

 large spreads of cotton-soil in various parts of the valley. To the 



Gogulapalle quartzite east tnis valle 7 is bounded by an important band 

 nd S e * of quartzites, which may be traced some 20 miles 



northward from the southern boundary of our area, and which rises into 

 ridges of considerable height (500'-600') near Irur (Eroor) and near 

 Gogulapalle. 



This quartzite ridge, which I will designate as the Gogulapalle 

 (Gogoolpully) ridges, represents very probably the Sitarampuram 

 quartzite ridge first referred to, towards which it dips. It is in its 

 Pamur schistose series turn underlaid by another schistose series which 

 and area. includes locally several other sets of quartzite 



beds. To this schistose series the name of Pamur series may be 

 appropriately given from the important village of that name lying 

 some four miles north-east of Irur. The stratigraphical relation 

 of the several quartzite ridges and schist valleys just named seems 

 clear, within the region occupied by the head waters of the Man-eru • 

 but northward of Gogulapalle and eastward of Pamur, the extension 

 of these several rock series cannot be followed with any certainty. 

 The continuity of the formations is interrupted, mainly by great 



( 13 ) 



