80 E00TE : GEOLOGICAL STRUCTURE OF THE EASTERN COAST. 



(Mutnur) is approached, where a number of well-sections show the 

 nature of the underlying rock. 



In a well east of the road to Chebrolu and a little to the north of 

 Mutlur the following section is seen : — 



4. Alluvium. 



3. Sandstone, friable, buff ~) „ ^ , 



2. Sandy clay ... ■> 



1. Clay wbite (sligbtly mottled yellow, red and dark-grey). 



The white clay is chiefly below the water-level. The beds appear to 

 dip east-by-north, at 5°. 



On the highest ground more to the north of the village, several wells 

 show rather friable gritty sandstones of pale mottled buff pink and pur- 

 plish colours ; lateritic gravel %'-h[ thick rests upon these. 



To the west and south-west of the village the sandstones have a 

 southerly dip, and the thickness of the lateritic gravel overlying them in- 

 creases up to 8 or 10 feet. None of the beds at Mutlur yielded any 

 fossils, though they were carefully examined. 



The last ease of rocks that might possibly be referred to the Raj- 



mahal series must now be mentioned. It occurs 

 Ippatam conglomerate. 



atlppatam, 4| miles south-by-east oi the southern 



end of the Bezwada anicut, and 3 miles east-by-north of Mangalagiri, 

 where a very small patch of coarse conglomerate, resting on the gneiss, 

 disappears eastward under the alluvium of the delta. This conglomerate 

 consists of pebbles of quartz, some of gneiss and a few of quartzite, 

 united by a lateritic matrix showing true vermicular cavities, where the 

 included pebbles are not very numerous. The bed dips at from 3° to 5° 

 to east, and about 30 feet in thickness of it is exposed. No fossils were 

 seen in it, so its age can only be inferred on other grounds. On peno- 

 logical grounds it is not assignable to the Rajmahal beds, though its 

 stratigraphical position is suitable. Petrologically it differs greatly also 

 from the ordinary lateritic formations of the surrounding country, nor is 

 there any stratigraphical connection with closely adjoining lateritic 

 ( 80 ) 



