BUNDELCUND. 75 



extensive surface workings on the very river bank. The same may be 

 said of several other valleys. Judging even from the worked deposits of 

 this class, we can see how small a remnant the present area of rock-ore 

 forms of its original extent — it is probable that its former expansion 

 was to west and north of this remnant. 



The position of the Udesna mines gives a hint on the denudation of 

 Denudation, character these rocks— that these open valleys in the Rewah 

 ridge are not altogether due to atmospheric and 

 river action ; the whole must have been under water when these 

 diamonds were washed into this position. This of course hangs on the 

 supposition of their being derived from the rock-ore below, of which 

 there is but a strong probability, it being the only known fixed loca- 

 lity — but on the other hand if the diamond be but a pebble in the 

 conglomerate, there is every chance of there being diamonds scattered 

 through the associated rocks, as quartz grains of the same size are 

 abundant. However, there is other sufficient proof of the recent submer- 

 sion of this country. 



Igneous Rocks. 



My remarks on the igneous rocks must be scanty as were those on the 



. .. . , crystallines : having very slightly affected the stra- 



Among the crystal- J ' ° J ° J 



lmes - tified rocks with which I was chiefly engaged, I 



only noticed them casually. Trap dykes and veins, from many yards to 

 one inch wide, are to be met with any where among the crystallines, 

 though they are more abundant in some places than in others ; some- 

 times they run with the strike of the foliation and as often across it, and 

 generally, in both cases, show unmistakeable evidence of intrusion, 

 being fine and earthy at the edges and comparatively crystallized in the 



