38 EOOTE : GEOLOGICAL STRUCTURE 03? THE EASTERN COAST. 



loose blocks ou the summits of the Chimakurti mountain in a nearly 

 equal degree, the majority of the blocks being of very moderate size. 

 The great confusion existing among the fallen blocks on the flanks of 

 the south peak of the Kanigiri hills already referred to (page 34) is doubt- 

 less also in a measure due to this earthquake action ; but from the vastly 

 greater average size of the blocks, they would only be affected by violent 

 shocks, which are of much rarer occurrence. 



The dip of the bedding of the Bogala Konda " trappoid " beds appears 

 to be easterly, but is very obscure. A bed of ordinary hornblendic 

 o-ranite gneiss close to the western base of the hill has however a 

 very distinct south-easterly dip. 1 



I only experienced one earthquake shock while working in the 

 Guntur-Ongole country, and that certainly did not emanate from the 

 Roo-ala Konda centre. It was on the morning of the 11th March 1867, 

 about 7 miles west of Vinukonda and 17 miles west of the Bogala Konda. 

 The shock caused a distinct tremor of the ground, travelling from north- 

 east to south-west, and was accompanied by a loud rumbling noise, lasting 

 several seconds. Frequent slight shocks have been noticed by the officials 

 and other residents at Ongole. 



Beds of equally trappoid hornblendic gneiss occur at a few other 

 places as inliers within the schistose area, e.g., between Maddalur and 

 Yanekepad, 12 miles west of Ongole; and again 8 or 10 miles further 

 south-west, near Zarlapalem, on the path from Peddakandla Gunta to 

 Tangella, and near the latter place. These latter beds are intercalated 

 with beds of quartzose gneiss rolling in small anticlinals and synclinals. 

 Similar trappoid beds, strongly simulating contemporary trapflows in their 

 appearance, occur also north and west of Tangella and east of Byana- 

 palem. Two other examples of intensely trappoid hornblendic rocks are 

 worth mentioning. Both occur in the valley of the Man-eru, the larger 



and more important forming the Enemerla hill, 

 Enernerla hill. 



3 miles east of Pamur, the smaller forming a 



Bogala Konda is probably between 1,200 and 1,300 feet high, and extremely steep on all 

 sides. I went up the south-west side and found it a very stiff climb, especially over the 

 scree near the summit. The panorama from the top was very disappointing. 



( 38 ) 



