58 KING : COASTAL REGION OF THE GODAVARI DISTRICT. 



Tripati sandstones. On the whole, however, they answer best, by their 

 constitution and position, to the lower beds of the present group. 



The old diamond mines of Muleli on the south-west edge of this 

 patch were partly worked in these sandstones. 



The lie of the Rajahmundry beds is at a very low angle to the south- 

 south-east, at about 5° or so; occasionally they are nearly horizontal. 

 At Dowlaishweram, there is a. good deal of undulation and various dipping 

 on the quarry hill, accompanied by strong alteration of the beds almost 

 to the condition of quartzites, evidently the result in great part of local 

 squeezing and faulting. The dip is on the whole, that is, over the whole 

 field, rather more to the southward of east than is the case with the 

 beds in the trappean series. 



The unconformability and overlap of this set of sandstones on the 

 Deccan traps are after all much more decided than those existing between 

 the ages of infra and intertrappean deposits, showing that it must be con- 

 sidered as belonging to a series of much later age, or that it is undoubtedly 

 of the tertiary system, and possibly of middle eocene age. We are thus 

 able to give the Cuddalore sandstones, which were only known in their 

 own field to be post-cretaceous, a rather more definite position, though 

 we must still wait for that further evidence which shall probably be 

 deduced from the occurrence of tertiary fossiliferous strata known to 

 be associated with the laterite, or, possibly, sandstones of this present 

 series in the neighbourhood of Quilon on the western coast. 1 



CHAPTER VI.— ECONOMIC GEOLOGY. 



Building stones, Sfc. — Beyond the occurrence of very good building 

 stones, such as those obtained from the different sandstone groups and 

 the trappean series, and the limestones associated with these, which have 

 been very largely used for mortar, there is little of economic interest 

 in this part of the Godavari district, as far as the development of other 



1 See Manual of the Geology of India, Part I, pp, 337-338. 



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