IN SOUTHERN INDIA. 



323 



caused this work to lie over for several seasons. The memoir 

 deals chiefly with the metamorphic and transition rocks which 

 occupy nearly the whole area. The sedimentary rocks 

 including a few small outliers of Upper Gondwana age and 

 a fringe of patches of lateritic rocks are of small interest. 



The critical examination of the rocks of South India has 

 led to their being divided into several systems and groups 

 which may, for convenience of study, be arranged in tabular 

 form as below : — 



Recent and 

 Post-Tertiary. 



&\ 



g J Tertiary. 

 2 ' 



i i 



8 l f 

 C 



Upper 

 Cretaceous, 



b 



S3 

 O 



List of Formations in South India. 



i Blown Sands, " Teris " or red sand hills of Tinnevelly. Soils 

 generally. Kankar, modern alluvia, fluviatile, estuarine, 

 and marine. Marine sandstones and limestones of 

 , Tinnevelly and Madura Coasts. Low level laterite. 



1 Sandstones, clays and lignites of Travancore and Ratnagiri. 

 S Cuddalore sandstones. 



High level laterite (iron clay) of the Southern Deccan. 

 f Trap -flows and inter-trappeans ( A - , 

 | of South Mahratta country | £2JK!^ | Groups of 

 4. and Rajahmundry, Lameta or<( ri , " )> marine 

 infra-trappean of Rajah- j y ' j origin. 

 ^ mundry. [ aur * J 



r 



Gondwana 

 System. 



° ) 



Upper. 

 ^Palaeozoic 



f Vindhyan j Upper, 



j System. \ Lower. 



| Transition f 

 | or Sub- 



f Plant beds of East Coast Utatur. 



!/ Pavulur. ) Tripetty. 

 Sattavedu. 1 Yemavaram. ( Ragava- 

 Sripermatur. j ( puram. 



I Budavada. J Golapilli. 

 f Kamthi group, f 

 Gondwana. | | Of Godavari Valley 



Triassic <{ Barakar group. J, and 



| | South-East Deccan. 



^Talchir group. ^ 



Upper 

 Gondwana. 

 (Jurassic 

 Triassic). 



i Lower 



o <{ Meta- 

 I morphic. 

 I Metamor- 

 j phic or 

 ^ Gneissic. 



Upper. 

 Lower. 



Karnul and Bhima Series. 

 Kadapa and Kaladgi Series. 



| Gneiss, granitoid and schistose rocks with associated traps, 

 | granite, and quartz veins. 



Much other information not published officially was gath- 

 ered by the different members of the Survey during various 

 trips made when on leave ; this need not be specially alluded 



