33 KING : NELL0RE PORTION OP THE CARNATIC. 



Shamudtha, about 4 miles due south o£ Saidapuram and at the north end 

 of the tank, there is a ridge of highly micaceous quartz-rock, the 

 bedding striking north-north-east to south-south-west, and the dip being 

 an undulating or rolling one, The massive^ quartz -rock is occasionally 

 weathered into what appears to have been a coarse conglomerate of big 

 quartz pebbles with their longer axes in the direction of the strike. These 

 lenticular rounded masses are thickly coated with silvery mica, which is 

 stringed out as it were along the laminse ; close by and east of the quartz- 

 rock there is a schist in which the mica preponderates over the quartz to 

 an enormous extent, and beyond these are dark-green chlorite schists. I 

 think this can hardly be considered a conglomerate, particularly as to the 

 north, in the same line, compact quartzites occur of a clear conglomeratic 

 constitution. It is more probably a case of micaceous quartz-rock showing 

 a very exaggerated form of segregation of the quartz in rude spindle- 

 shaped masses — just as the quartz in ordinary coarse micaceous schists is 

 often found assembled in small lentil-shaped masses — around which the 

 mica is gathered and runs thence in the laminae of the rock. 



The original condition of the quartz-rock or quartz-schist beds is often 

 shown in the weathered outcrops, a very good display occurring in the 

 bed of the nala running past Vadanapurti some 6 miles north of Dasur, 

 where the section gives a series of schists and shales of pale-green, grey- 

 ish-green, and dark-green colours, with grey, yellow, and yellowish-red 

 sandy shales, the latter being merely weathered quartz- schists and 

 exactly like recent sandy shales. 



Thus far, I think, it is fairly clear that there is a gradation in the 

 A gradation in the quartz-schists from the excessively coarse beds of 

 scries evident. Narasimhakonda through more and more compact 



beds to the sugary and then the waxy form of quartzite, and even to fairly 

 rippled and pebbly beds, though coarse granular crystalline forms are 

 still met with here and there with the denser strata. 



However, this gradation runs closer in the neighbourhood of the 

 boundary between the crystallines and the transition series ; and here 

 I must allow the great difficulty there is in distinguishing the quartzites 

 ( 140 ) 



