ECONOMIC GEOLOGY. 107 



largest rough stone buildings of olden times are the old hill forts of 

 Kondavidu and Bellamkonda ; of modern buildings the great anicut, or 

 weir, over the Kistna is pre-eminent. 



The Rajmahal sandstones of Tangellamudi, Chebrolu, and Pavulur 

 supply the Public Works Department with considerable quantities of 

 building material for the various works — bridges and sluices — connected 

 with the irrigation channels in the western delta. The two former 

 localities were also largely resorted to at earlier times for their red and 

 purple sandstones, which, from their easy workability and rich colour, 

 were in great demand for temples and for gravestones by various castes 

 of Hindus. 



The new field demarcation accompanying the revenue settlement has 

 also created a local demand for rough boundary stones in many places 

 where they were not previously quarried, and in many of the alluvial 

 tracts such stones have been carted a long way. 



Some fine examples of old carved and polished stones, which must 

 have been carried long distances, are the carved bulls and lingams remain- 

 ing among the ruins of several temples at Kanupati, on the coast, a little 

 north of the mouth of the Gundlakamma. These ruins do not stand, as 

 stated in the Nellore District Manual (page 431), upon a reef of hard 

 rocks, but upon the pure alluvium, in which not a scrap of stone is to be 

 traced except the ruins of the temples themselves. 



Large quantities of salt are made at numerous salt-pan stations 

 along the coast, but they offer no peculiarity requiring to be mentioned 

 here. 



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