58 FOOTE : SOUTH MAHRATTA COUNTRY. 



stretches across the Raichur Dodb from the banks of the Tungahhadra 

 near Cachapur to the banks of the Krishna at and 



The Doab series of j^^^^, j^j Druff : members of this g-roup rise in places 

 dykes. ^ 



into rocky ridges 2 or 3 feet above the plains and 



are conspicuous far and wide from their intensely black color. At other 



places they disappear under the soil (which over the greater part of the 



Doab is regur, forming vast spreads) and are lost sight of for considerable 



distances. Several may be traced by the naked eye for many miles across 



the country. 



The very numerous dykes occurring in the Raichur Doab, and in 

 the adjacent parts of the Kaladgi district, and in the Sorapur Taluq, 

 (Nizam's Dominions), north of the Krishna, may in great part be assign- 

 ed to several different groups or series, according to the direction of their 

 courses. No distinction can be drawn between the several groups as to 

 priority of ages, for in all the cases in which dykes were found crossing 

 each other's course, they presented the appearance of being perfectly 

 contemporaneous and of having been formed by the same act of intru- 

 sion from the same source filling up two or more fissures simultaneously. 

 A number of the dykes, however, cannot be referred to any group in 

 particular, while some vaiy considerably in the direction of different parts 

 of the courses, which renders it difficult to know to what group to assign 

 them. No lithological peculiarity was observed to attach itself to any 

 special group. The principal groups are as follows : — 



The JDodb group, so called because the chief members of the 

 The Doab Group: - g^'°^P ^^^ ^® traced, with only a few breaks, from 

 W. N. W. to E. S. E. close to the banks of the Tungabhadra right 

 across the Raichur Doab up to or across the Krishna river. The 

 course followed by these dykes is generally west-north-west to east- 

 south-east. 



The great Gutt Bichal dyke before mentioned is a leading mem- 

 ber of this group, which is also well represented near Kautala (Civital) 

 ( 58 ) 



