48 KING : COASTAL REGION OF THE GODAVARI DISTRICT. 



There is occasionally a good deal of silica segregated through both 

 upper and lower bands, in the form of ealcedony agate common opal 

 and rock crystal in amygdala and geodcs, and large masses of calc-spar 

 are common ; but all these are more frequent in the Pungadi field, where 

 the exposures are vastly larger. 



In the face of the Kateru quarries, the trap, when least weathered, 

 is a compact dark-brownish-green earthy rock separating in rude 

 sub-angular masses with large sub-conchoidal faces. The bottom edge 

 of the upper trap is weathered for a few inches of a yellow colour ; 

 it is also amygdaloidal with small kernels of dark olive-green clayey 

 matter, the vesicularity being strong for 3 or 4 inches and then rapidly 

 disappearing. 



The contact of the limestones with the underlying trap is, as already 

 observed, not exposed. 



There are about 100 feet of the upper traps, which are again overlaid 

 by the Rajahmundry sandstones; the thickness of the subjacent band is 

 unknown, but the stream channel at the north-east end of the quarries 

 shows from 40 to 50 feet of them. 



The intermediate band of limestones is, when best seen, from 12 to 



14 feet in thickness ; but it thins out to the north- 

 Theintertrappeanband. , 



east and is not round at what ought to be its 



point of outcrop on the Korekonda road. It consists of beds of varying 



thickness, none of which are constant for any length ; but the following 



is the arrangement of beds generally met with, in descending order : — 



1. Dark chocolate-brown and greenish clayey mud. — 8 or 9 inches. 



2. Dirty greenish fossiliferous calcareous mud, hardening somewhat on exposure, 



, A. few inches, to a foot or more in thickness. 



3 Earthy, clayey, brownish and pale-coloured limestone j with occasional fossils. 

 —1 to 2 feet. 



4. Compact waxy pinkish limestone.— 1 feet. 



5. Yellow ferruginous clayey limestone. — 2 to 3 feet. 



6. Compact waxy limestone, changing downwards into crystalline and fibrous 



pearly-grey, brown, and reddish dolomite. — 6 to 8 feet. 



All these, except the fossiliferous mud, may be found more or less 

 ( 242 ) 



