l62 FOOTE: GEOLOGY OF THE BELLARY DISTRICT. 



At the extreme south end of the Sandur synclinal a large dyke 

 In the Sandur area. shows cutting through the basement beds of 

 GoUa-Linganahalli the Dharwars locally, and running up north-west- 

 ward past Golla-Linganahalli and disappear- 

 ing finally in the basement trap-flow a little to the east of Tonas- 

 hagiri village. No contacts were to be seen here. To the southward 

 of the extreme end of the synclinal, the great dyke trends south-east 

 and crosses the Rampur spur of Mysore territory (over which I did 

 not follow it up). It is possibly the extension of the great Kailasa 

 Konda dyke west of Raya Drug which runs down south by east to the 

 Haggari river which it crosses, and may be followed by the eye for 

 many miles further south. If the two dykes are really continuous, they 

 measure over 38 miles in length, and are of great size. The dykes rise in 

 many high blocky crests of jet black colour, and are very conspicuous. 

 Proceeding north-eastward from Golla-Linganahalli to the Copper 

 The Copper Moun- Mountain synclinal, a large dyke is found to the 

 tarn dyke. north-west of the Sugadevibetta peak which 



runs in a south-west by west direction. Its eastern end descends the 

 northern spur of the peak ; and trending to east by south, crosses 

 the Bellary-Bangalore road near Halakundi, and disappears under the 

 cotton soil a couple of hundred yards west of Mincheri. The dyke 

 at this point has diverged northward just outside the boundary of the 

 Dharwar area ; but about a mile further east by south what appears 

 to be a continuation of it rises again and forms a high well-marked 

 outcrop which trends south-east by east, re-enters the Dharwar 

 area in the Mincheri hills, and continues in it for nearly a mile and 

 a half and then dies down at the south-eastern extremity of the 

 Copper Mountain synclinal, and is finally lost sight of under the 

 cotton-soil plain. The dyke consists of black diorite (?), and 

 measures some 13 miles in length along its curve. 



The only other remarkable dyke in the Copper Mountain band 



Great dyke west of is a very large and broad but ill-defined one 



Kudatani. lying a mile and a half west of Kudatani, and 



about the same distance east of the Budikanama Ghat. The dyke 



( 162 ) 



