LOWER TRANSITION ROCKS. 131 



cannot by any possibility be correlated with the rocks in the 

 Wabhadra Konda spur and Donimale, for it is quite improbable that 

 the great haematite beds characterising the eastern wall of the Sandur 

 synclinal should have disappeared within the distance of a mile or 

 little more. Despite, therefore, the appearance these schists present 

 of overlying the Joga trapflow, the most reasonable conclusion is 

 that they really underlie them, and are equivalents of the Joga hills 

 series, but without the great haematites. 



The Lingadahalli schists consist largely of pale chloritic schists 

 and grey argillites, with here and there small bands (thick laminae) of 

 crystalline limestone. 



The hills lying north of the Lingadahalli schist tract are made up 

 of trap of the " Joga flow " overlaid by several other trappoids and 

 traps all very similar in character, but with here and there small inter- 

 calations of schists (chloritic and hornblendic) and haematite which 

 clearly prove the trap masses to be of different ages. The trapflows 

 immediately north of Lingadahalli are traversed by the great dioritic 

 The Avinamadagu d y ke already noticed as being close to Joga, 

 trap dyke. anc j w hich may be named after the village 



at its south-eastern extremity. It forms a high and conspicuous 

 crest towering well above the trapflows it cuts through. These 

 latter are coarse grained, mottled black and white with their horn- 

 blendic ingredient arranged in rather elongated fibrous bundles. The 

 great dyke consists of ordinary green and white mottled granular 

 diorite. No good section of the contact exists, but the dyke, as far 

 as can be seen, has had no effect on the rock they cut through. This 

 observation applies equally to the relations of the great dyke and the 

 flows it traverses along its long course north-westward past Joga. 



To the north-eastward of the dyke- crested hills lies a rather deep 



valley which divides the southern hilly part of the Joga-Sultanpur 



area in two : at its northern end lie the ruins of an abandoned village 



formerly known as Hattigenhalli. About a mile east of the northern 



Hattigenhalli lime- end of this valley, I came upon a small bed of 



highly crystalline limestone intercalated between 



12 ( 131 ) 



