SEC. 6.] 



PORTION OP THE CENTRAL PLAIN NEAR BHOOJ. 



159 



Their resemblance to walls is only attributable to regularity of joint- 

 ings which is notj however^ nearly 

 so general as to become character- 

 isticj and they vary in height, width, 

 and length, being generally con- 

 siderably above the level of the 

 plain, 30 feet or more wide, and 

 1^ ^ often traceable for more than a mile. 



^ Their junction with the adjacent 

 § sandstones is sometimes sharply de- 

 ■g fined, but frequently indefinite, and 

 ^ ft in some places, particularly on the 



. I southern slopes of the Katrol range, 



^ these reefs occur along the courses 



= of trap dykes. 



I 



S Their composition varies from 



'S opaque white or clear quartz to a 



£ dark blackish brown compact variety 



I of quartz rock. Several have been 



§ marked upon the map, and figures 



X of two are given further on. The 



^ position of the plain and structure 



S of the country will be understood 



S by reference to the annexed sketch 



I section. (Kg. 11). 



Kanyabuy. 



At the eastern side of the plain 



and in the neighboui-- 



hood of Kunyabuy, coarse 



white sandstones and ferruginous 



beds are occasionally seen, but much 



( 159 ) 



