IN SOUTHERN INDIA. 



297 



extremity respectively of the Kadapa area. Many far less 

 grand and beautiful scenes are elsewhere made the objects of 

 special visits, but these are lost to most people, as the eastern 

 slopes of the Yellakonda are in a wild out-of-the-way country, 

 and as the trains of the Madras North- West Line run past 

 the Nagari and Tripetty mountains in the night. Within the 

 Kadapa area the scenery is generally much tamer, but many 

 very noteworthy landscapes will impress themselves on the 

 memory of the artistic traveller. 



To pass on to the Karnul rocks, the principal interest in 

 which centres in their lowest member, the diamond conglo- 

 merite, the only member of the series which is positively 

 known at present to contain diamonds. Other beds have been 

 worked for these precious gems, as shown by their being 

 perfectly honeycombed on their surfaces over considerable 

 areas by old pits, but nothing positive is known as to whether 

 they really yielded any. 



The Karnul formation was divided by Mr. King into four 

 groups, named respectively (in descending order) — 



! ? hales ; 



Limestones. 



-I 



Paneum . . Quartzites. 



Jammalamadugu. ( Shales 



° ( .Limestones. 



Banaganpilly . . Sandstones. 



The tfDcks which are at present reckoned to the Karnul 

 formation in this part of the world occur in two basins ; the 

 larger and more southerly of the two occupies the valleys of the 

 Khunder and Bowanassi rivers extending from Kadapa 

 town northward to the banks of the Kistna, the smaller 

 basin lies some 50 miles to the north-eastward in the valley 

 of the Kistna, and covers nearly the whole of the so-called 

 Palnad, the westernmost part of the Kistna collectorato. 

 There are considerable stratigraphical difficulties about corrc- 



