GEOLOGY OF CENTRAL INDIA. 



49 



shape, an excellent example of which we have at Chitor, the ancient 

 capital of this country, which is situated on an isolated hill near the 

 boundary range before alluded to. 



The slightly waved plain, occupying the summit of the hill on which 

 this ancient city stands, or rather stood, for it is now in a complete state 

 of ruin, is said to be about fourteen miles in circumference. Its length 

 is six miles from N. to S. ; its breadth varies from quarter to half a mile. 



This breccia passes into a variety of quartz rock, sometimes nearly 

 white, more generally ferruginous, and in this case it is of a reddish 

 color ; it also occurs of a bluish green color. The purer varieties are 

 distinctly stratified, and some even approach to slaty. The strata are 

 sometimes almost horizontal, in other situations they are waved or 

 saddle-shaped. 



The rock in question sometimes assumes a very beautiful aspect. 

 On a hill to the north of Nimacli, I have seen it with a base of the na- 

 ture of agate-jasper, containing small rounded portions of quartz, and 

 exhibiting minute drusy cavities, lined with quartz crystals : the whole 

 being capable of receiving a high polish. At Ban it occurs both in 

 the form of a nearly pure quartz rock, horizontally stratified, and of an 

 unstratified breccia, composed of angular portions of pure white quartz, 

 and a red somewhat agatose variety of the same. This rock also occurs 

 exhibiting something of the appearance of the millstone grits. 



A very characteristic feature of the hills and hill ranges of this form- 

 ation, the conical hills of course excepted, is the blufF,dn many instan- 

 ces perfectly perpendicular crag, which their summits presents. The 

 bases of these hills, &c. are formed, as before stated, of the sandstones 



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