LOWER TRANSITION ROCKS, Iig 



No good section was met with in this division, the Narihalla sec- 

 Insufficiency of exist- tion excepted : the others met with were either 

 mg maps. . ver y s hort or else so imperfect, from one cause 



or another, as to be in great measure inferential only. Add to this 

 the incompleteness of the maps, both the Atlas sheet (59) and the 

 i-inch Revenue Survey map (in the omission of several large and 

 important ravines), and it will be easily understood that several 

 puzzling pieces in the southern part of the division remain with their 

 structure only imperfectly unravelled. It is unfortunate in this 

 respect that the i-inch Revenue Survey map of Sandur State shows 

 only so much of Sandur hills as lies within the boundary line, every 

 thing outside it being blank. Through the kindness of J. Cook, Esq., 

 Deputy Superintendent, Madras Survey, I was supplied with a copy 

 in which the hills and villages adjoining the Sandur territory on 

 the east and west sides had been sketched in, but unfortunately not 

 those on the south-west and south sides, where this information was 

 really most wanted. 



As shown by the lower average of dips over the south-western 



. division as a whole, this part of the synclinal 

 Kumaraswami divi- 

 sion shows least deform- had undergone a materially lesser amount of 

 ation. . 



Geformation than happened to the other parts, 

 and no inversion of the rocks was seen in any section studied. 



The petrographical characters of the different rocks met with in 

 this division show only one feature differing from those of the other 

 divisions, the marked absence of jaspideous character in the poorer 

 haematite quartzites. It may be taken as additional evidence that; 

 the rocks here had undergone less deformation than the other parts 

 of the synclinal, but beyond this it is a fact deserving but little ' 

 notice. 



Of the three great haematite quartzites which form the western flank 

 The Devadara group of the Appianhalli narrow synclinal, and which 

 of hsematitic beds. are extensions of the Devadara group of haema- 



tites, the lowest one appears to have thinned out a mile north-west 

 of the ghat road saddle above described (page 1 14). The remaining two 

 can be traced about a mile and a half south-south-east, and then die 



( iiQ ) 



