i*4 On the Bandeo Quartz-Rock. 



he distinguished, it is, in its mineralogical characters, more near- 

 ly allied to quartz than to any other rock, and is most exten- 

 sively distributed throughout Hindostan as a member of the 

 clay-slate series. In many situations it Is found passing into 

 the pure white quartz-rock on one hand, and into the clay- 

 slates on the other. The horizontal position of the strata near 

 Bandeo appeared to me at the time to be very distinctly 

 marked ; and, at an after period, I requested a friend to visit 

 the spot, and to favour me with his opinion on the subject. 

 His observation entirely coincided with what I had previously 

 .supposed to be the fact, and he furnished me, at the same time, 

 with a sketch of the appearances presented, which led to a simi- 

 lar conclusion. It is but fair to state, that my friend had not 

 made geology his study, and in my own mind, I confess I am 

 not perfectly satisfied on the subject. This hesitation on my part 

 has arisen from after reflection ; at the period when I wrote the 

 account published in your Journal, I had not the slightest doubt 

 of the correctness of my statement. I have since been some- 

 times inclined to believe that the bed in question was a peculiar 

 modification of one of those numerous rectihnear quartz veins 

 which traverse this country in all directions, and which may fre- 

 quently be traced over a considerable stretch of surface, or 

 forming the spines of the hill ranges. These very generally 

 follow a direction parallel to the planes of stratification. In this 

 last case, the rock in the vein might have been horizontally stra- 

 tified, while the bounding clay-slates might have retained the 

 general vertical position of the strata of the neighbourhood. 



I would now offer a few words in reply to the observations 

 contained in Note, p. 123. Vol. VII. And, in the first place, 

 I must plead guilty to the charge of having been obscure and 

 indistinct in describing the geology of the Cheetore Hill. The 

 fact is, my ideas on the subject w^ere at that time very vague and 

 indefinite ; and, in endeavouring to avoid being too precise on a 

 point upon which I felt my own want of information, I have 

 fallen into a contrary extreme, and have presented you with an 

 account so indefinite a? to render it utterly valueless. I shall 

 now endeavour to remedy this evil, though I must say that the 

 subject is still involved in much difficulty and obscurity. 



The " clay-slates," or rather the sandstone slates and shales, 

 upon which repose the waved quartose strata of Cheetore, be- 



