GNETSSIC ROCKS. 25 



railway junction) or the band exposed as Timmarajapuram 3 miles south- 

 south-west of Meltattaparai Railway Station are doubtful. So also are 

 those of low granular quartz ridge lying l^ miles north-east of Sivali- 

 perri (Shevvelperry) which disappears northward under the alluvium of 

 the Chittar. To the same category belong the outcrops formino- the low 

 hills to the west and south-east of Pudukotai (11 miles south-west of 

 Tutikorin). It was found equally impossible to correlate these outlyincp 



Vallanad beds outcrops with the great band of granular quartz 



rock forming the Vallanad ridge. The granular 

 quartz lock here forms a great anticlinal curve, the eastern limit of 

 which extends south-east towards Sevalai (Shenvetta) and Verankulam 

 in the Tambraparni delta under which it disappears. To the south the 

 western limb of the Vallanad anticlinal curve re-appears south of the 

 river in a gneiss inlier 3 miles west of Pudugudi, but its further exten- 

 sion is lost sight of under a sandy plain. It is possible that the o^'anular 

 quartz rock bed forming the hills west of Vallanad ridge may form 

 part of the anticlinal curve and have its eastern limb represented by the 

 quartzite ridge which disappears under the alluvium of the delta to the 

 north-west of Perunkulam (Perungcolum). 



The great double band of granular quartz rock south of Palameotta 

 Palanicotta granular forms several Very well-marked and conspicuous 

 quartz ruck beds. ^.^^j.^ ^.j^^.^^ ^^ ^j^^ Eettiapatti (Kuttiaputty) hill, 



the Sevandipatti (Shaminthaputty), and the Kistnapuram and Thurva 

 ridges at the eastern and western extremities of the band. The western 

 extremity of the southern of these two bands of granular quartz rock 

 crosses the Tambraparni 3 miles south of Tinnevelly town, theu rises 

 into the Sangani (Shenganny) Trigonometrical Station hill, beyond 

 which it continues westward for some distance into the unsurveyed 

 tract. 



The northern of the two bands which form the Rettiapatti ridge 



, Eettiaputty ridge. ^''' ^^""^ suddenly close to Rettiapatti village 



and cannot be traced any further westward ; it is 



probably cut off by a fault, but this cannot be positively proven owing to 



( 25 ) 



