A RAVALLI SYSTEM. 63 



The position at Bodi is best illustrated : n the section (see text fig. 9). 



Si 



AlLuvium 



rtncf 

 blown Sani 



Pcctmatite 



Jlh. 7)i ecln ctc/crr 

 San d 'stone 



Biotife etnrl 

 Horn f>/t>n efe 

 Sen i st 



N.W- 



Ra 9. 



The pegmatite dykes {/ifg) are from 3 feet to 6 feet in width, im- 

 perfectly exposed, and consist of quartz, pink and white micro- 

 cline, 5 2 /- 7 , 5 2 / 8 muscovite and a little black tourmaline (J*A). They 

 are arranged vertically, with strike parallel to that of the invaded 

 schists, which is about E.byN.— W.byS. The muscovite plates 

 (*2s) are numerous, and appear generally among the quartz, \ inch 

 to 1 inch or \\ inch plates being most common, and very occasion- 

 ally a little larger, but any plates as much as G inches across are 

 unknown. Besides being found among the quartz, when differ- 

 entiated into a separate layer, the mica plates are also found in 

 what is simply a coarse mixture of the three minerals. 



Elsewhere, beyond the hill-spur, the bands of pegmatite, as 

 shown in the section and also those which occur further north, 

 are generally invisible beneath the 10 to 50 feet of alluviumj 

 but in the actual stream-beds sufficient outcrop is seen to allow 

 one to deduce their position within a certain limited area. 



Numerous small trial excavations for mica have been made 



along the crests of the little ridges which 

 ^ Prospecting pits for ^^ plagiocIinally the ^^ m ()f ^ m _ 



spur E. of Bodi. It does not seem that any- 

 thing more useful than small mica has ever been extracted, or is 

 likely to be obtained from this area. 



(6) Bamanvada — Jesanqpur area. 



This area is undoubtedly the most continuous in its discon- 

 tinuity. It is a nearly Hat plain, some 12 miles long by -i broad, 



f2 



