50 FOOTE : GEOLOGICAL STRUCTURE OF THE EASTERN COAST. 



exhibit. For convenience in describing the several patches, they may- 

 be taken in four groups : — 



1. The Kandukur (Cundacoor of sheet 76) group. 



Distributed into four groups 2. The Ongole group. 



3. The Vemavaram-Budavada group. 



4. The Guntur group. 



Of these, the Vemavaram-Budavada group is by far the most extensive, 

 the most diversified in petrological features, and the richest in organic 

 remains. 



In the Kandukur group I include the various patches in the valleys 

 of the Vupput-eru and Man-eru, and those occurring within or border- 

 ing the Kandukur laterite area; also a small outlying patch, a mile 

 east of Ilavara (Yellavurra of sheet 76), 11 miles north-north-west of 

 Kandukur. 



The Ongole group consists of two patches and several small exposures 

 of shales about 6 miles west of Ongole town. 



The Vemavaram-Budavada group includes all the patches lying 

 between the Gundlakamma and the Perachur river. Of six patches, 

 four are of importance ; these are the Vemavaram, Budavada, Idupula- 

 padu, and Pamur patches, called after the geologically most important 

 villages situated on them. 



The Guntur group consists of three patches, two of which are of con- 

 siderable size; the Tangellamudi and Chebrolu (Bebbralu of sheet 95) 

 patches lie in the alluvium of the Kistna delta to the south-east of 

 Guntur. The third, of small extent, lies within a laterite area, 15 

 miles south-west of Guntur. Besides these, there are a number of expo- 

 sures through the lateritic deposits just alluded to, and also through that 

 occurring at Guntur itself. 



The most southerly of these four groups, the Kandukur group, is 

 ■ m „ , , composed of a considerable number of small and 



The Kandukur group. 



widely scattered patches, all occurring, as already 

 stated, in the valleys of the Man-eru and Vupput-eru, or bordering the 

 ( 50 ) 



