94 FOOTE ; GEOLOGY OF THE BELLARY DISTRICT. 



State, though an immense help, was lacking in definition in some parts ; 

 for example, to the south-east of Kumaraswami's temple, where several 

 large and deep ravines draining to the south-east are absolutely 

 omitted. They are omitted also from the atlas sheet No. 59. The 

 only trigonometrical point in this quarter — that marked in the atlas 

 sheet as " Malla Ammanhurroo "— is unluckily not given in the one- 

 inch map, and the survey as shown in the one-inch map stops 

 abruptly along the fiscal boundary of Sandur State, so it was impos- 

 sible, in the absence of any one fixed point, to effect any corrections 

 or additions to the one-inch map. In sheet 59 a second point was 

 wanted on which to make observations, to settle the positions of 

 the great ravines above referred to. 



The remarkable flatness of the Sandur hills has already been ad- 

 verted to, and it was one of the principal difficulties to contend with 

 in mastering the structure of the hill masses, for there are no high 

 points from which to get commanding views enabling one to take in 

 the obscure relations of the different formations, and there are no 

 conspicuous points of which to make landmarks. 



It is not yet possible to correlate exactly all the beds on both 



sides of the synclinal, the continuity of the 

 Correlation of form- 

 ations on both sides of several hsematitic beds being too uncertain to 



let one feel positive that the mere numerical 



sequence is enough for such identification. At both ends of the 



synclinal several of the beds thin out and die away completely, while 



at the northern end a good deal of faulting renders all conclusions 



uncertain and hazardous. Still it is, I believe, safe to regard the 



Hoshalli trap flow in the south-eastern valley between the Donimale 



and the Devadara spur of the Kumaraswami division as the central 



and uppermost bed of the synclinal. 



The Sandur hill and Copper mountain series is by far the fullest and 



_' , , most varied of any of the Dharwar bands or areas 



Predominance or fer- J 



ruginous rocks. as y e t worked out. The most striking feature 



established is the predominance of the haematitic iron beds, and more 

 especially of the haematitic quartzites in which the silicious laminae 

 ( 94 ) 



