SCHISTOSE AREAS. W 



The quartzite beds of Chendalur hill are so strikingly like those 

 Chendalur hill quartz- o£ the newer Kadapa rocks, that, but for the 

 ltes - existence of the great band of unquestionably 



gneissic quartzites above referred to, I should have unhesitatingly mapped 

 Chendalur hill as an outlier of Kadapa rocks. As it is, I look upon the 

 Chendalur quartzites as belonging to the gneiss, but with a lingering 

 feeling of doubt, due, perhaps, to my having, when I first visited Chenda- 

 lur hill, been strongly prepossessed in favour of its Kadapa age from its 

 appearance as seen from the west and south-west. The quartzites are well 

 exposed in a grand cliff at the south-western end of the ridge, 1 and the 

 cliff recalls, though on a smaller scale, many of the grand precipices, 

 scarping the Nagari mountains and the southern parts of the Vella- 

 konda range. 



The Chendalur quartzites are seen to rest, at the northern end of 

 the ridge, on granite gneiss, to which they appear conformable ; to the 

 west they appear to dip conformably under a bed of iron-grey quartzose 

 gneiss ; while at the south-western end of the ridge the quartzites dip, 

 also in apparent conformity, under the hornblendic beds close to the 

 village of Bundevaleganla. Viewed as a whole, the Chendalur hill 

 appears to be the southern extremity of a narrow and much contorted 

 anticlinal ellipse. The beds have a quaquaversal outward dip on all 

 sides but the north. I failed in tracing any signs of faulting, which 

 must exist supposing the anticlinal ellipse to be an outlier of the Kadapa 

 rocks. 



Intercalated between the quartzites on the back of the anticlinal is 

 a thick bed of slaty argillaceous schist, which being much softer than 

 the quartzites has been deeply eroded, and has thus given rise to the 

 formation of a small but deep valley in part of the hill mass. 



1 As seen from a distance from the west and east, the outlier of the southern end of 

 Chendalur ridge presents a most striking likeness to a gigantic hippopotamus standing half 

 immersed in water and looking south. This resemblance to an animal does not appear to 

 have struck the natives, owing doubtless to their non-acquaintance with the genus hippo- 

 potamus. 



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