90 EOOTE : GEOLOGICAL STRUCTURE OE THE EASTERN COAST. 



covered with cotton soil on the higher ground to the south. Both this 

 patch and the Ramapatam area are shown on the map as extending south 

 beyond the limits of sheet 76 ; this is correct, but the extension is for 

 a very short distance only, as the gneissic rocks appear rapidly with the 

 rise of the ground. 



Proceeding north to the valley of the Musi (Mooshee) river, the 

 three small patches near Annakarlapudi (Unnakarlapoody), Maddalur 

 (Muddaloor), and Chilikipad consist of coarse shingle, but are much 

 obscured by cotton soil. 



The Amanabrolu (Ammanabroloo) laterite area, 9 miles north-east- 

 ward of Ongole, forms a low flat down, which 

 Amanabrolu patch. . ■• . 



is quite bare or vegetation opposite bowtapalem. 



It consists generally of lateritic gravel, but a true conglomerate with 

 included quartzite and gneiss pebbles, and numerous fragments of the 

 Rajmahal rocks, occurs in the southern slopes. To the west and north 

 everything gets soon covered up by thick cotton soil. 



The fringing beds around the Rajmahal patches of Budavada, Idupu- 

 lapadu, and Panur, and the small outlier at Parachur, on the old Madras- 

 Guntur road, all consist of lateritic gravel much mixed with and obscured 

 by cotton soil. It is only here and there over small surfaces that the beds 

 are conglomeratic and consolidated. 



The laterite at Guntur is partly gravelly, partly conglomeratic, the 

 latter variety being best seen to the south-east of 

 the town, close to the alluvial boundary. In the 

 town the laterite rests on soft gritty sandstone of Rajmahal age, but to 

 the west and north-west it overlaps on to the gneiss. The patch of 

 gneiss which runs up from near Guntur to the bank of the Kistna is 

 fringed by gravelly laterite more or less all along its eastern side. 



The two Rajmahal inliers in the alluvial spread adjoining the 

 Kistna delta to the east of Guntur both show extensive fringes 

 of lateritic gravel. The northern or Tangellamudi inlier is fringed 

 nearly all round. The southern or Chebrolu inlier is fringed simi- 

 larly in its northern half and at its extreme southern point. The 

 ( 90 ) 



