GNEISSIC ROCKS : TRAP DYKES. 59 



near Ling Sugur and Jal Drug. Dykes having the same eoui'se occur 

 on the left bank of the Krishna, north of Sorapur, and westward close 

 to the north-east corner of the Kaladgi basin, under which some of 

 them are lost sight of. 



Between Mudgal and Hire Mokartihal on the Bellary road and 

 south of the central assemblage of members of the Doab group near 

 Ling Sugur is a minor but yet important assemblage of dykes, some of 

 them of large size, pursuing a similar course, and therefore referable to 

 this group. 



Another important set, belonging to this group as regards the direc- 

 tion of course, occurs beyond the limits of this report in the northern 

 part of the Bellary district. 



The second group includes a considerable number of dykes, 



mostly second rate in point of size and length, 



W. S. W. to E. N. E. whose course is west-south-west, east-north-east. 



To this group belong a set of large dykes at 



Sorapur ; another set to the south-east-by-south at Mandurgi (Moon- 



durgi) (which are doubtless continuous with several dykes north and 



east of Mosulkal), and a huge dyke, the Kiadigiri (Keeadigerri) dyke, 



about eight miles further south. This dyke on several points in its 



course rises into considerable hills, 200 to 800 feet high or more. A 



large dyke at Kunnusari, south-by-west of Mudgal, and a set of three 



dykes at Rolli on the right bank of the Krishna close to the Kaladgi- 



Sholapur road. Besides these are several other important dykes scattered 



about in various parts of the gneissic area. 



To a third group or system running north-north-west to south- 

 south-east belong a small number of dykes. The 

 S. S. E. to^NTN. W. most important of these is a very large dyke, 

 which for a large part of its course forms a low but 

 very conspicuous rocky ridge, called the Karra Maldi (Curra Maldy), six 

 miles west of Tawurugiri. 



( 59 ) 



