king: nellore portion of the carnatic. 



fesembles the dense and fine granular rock of the Transition Series.. 



At the highest point of the ridge these are nearly vertical, and show 



Paint traces of ripplings. To the west of Ingoort, frequent beds of 



quartz-rock, with micaceous partings and lamina?, 



I\I i oil coons. 



occur among garnetiferous hornblendic schists. 

 The northern end of the Lingumpilly ridge is composed of beds of al- 

 most pure white or bluish-white coarse crystalline granular quartz- 

 rock with scales of silvery mica running through it. In a low ridge 

 about 2 miles north-east of Lingumpilly, there 

 are beds of a beautiful bluish-green semi-trans- 

 lucent saccharine quartz-rock. The western branch of the Ingoort diver- 

 gence runs up and meets the Penner about Patapad, where at the north 

 end of Ulavapali tank are beds of granular-crystalline grey and 

 buff quartz-rock, less coarse than that of Narsimhakonda, but not so 

 compact as ordinaiy Cuddapah quartzites. In the same neighbourhood, 

 Palacole ridge consists of beds of slightly micaceous quartzites, much 

 contorted in the strike of the bedding. Near the bottom of the ridge 

 on the eastern side, there are some thick beds of compact dark-bluish- 

 grey quartzite, and the same beds appear, but riddled with strings of 

 white quartz, at the foot of the Mamaduru ridge. This last ridge runs 

 right up to the Penner alluvium, and is made up of successiv e beds of 

 Maggy micaceous quartzose gneiss, micaceous and talcose schist, and 

 quartz-rock. 



As the rocks are now examined westward, the quartz-rocks, or rather 

 more generally quartzites, become much more frequent in thinner bands 

 with thinner beds or even flags ; while the proper gneisses are be- 

 coming more finely schistose and less quartzose as the more decided 

 band of fine schists is approached. At the same time, there is a greater 

 Epidotiforous or pis- frequency of trappean and trappoid outcrops ac- 

 tacitic quartz-rock. companied by a marked occurrence of epidote or 



pistacite through the strata, the quartzites occasionally being quite 

 green-coloured from the amount of this mineral distributed through them. 



Southward of Dasur there is a narrow and rugged little ridge 



( 138 ) 



