cxxii Report of the Mineralogical Survey [No. 126*. 



tion of a small piece even applicable to the purposes of the arts. It passes 

 into a yellowish grey talc slate, in straight lamina? a very beautiful 

 rock. The white indurated talc is also found associated with nodules 

 of quartz, the former being disposed in layers round the latter. A blue 

 limestone succeeds in nearly horizontal strata. It contains disseminat- 

 ed talc. We have then a talco- argillaceous schist, and thence siliceous 

 limestone, and white fine granular dolomite in various intermixtures 

 and transitions to the foot of the great Dhuj Peak. Nearly half way up, 

 we observe a talco -calcareous schist in moderately thin laminae of a 

 yellowish colour, the dip being to E. It is crowned by a purplish grey 

 micaceous schist of well marked character. In descending on the 

 other side, a very beautiful white fine granular dolomite, clouded with 

 green tints, is found, a rock that would furnish a very elegant marble. 

 Argillaceous schist is then established, and continues very nearly 

 to the descent into the valley under Petorahgurh. Limestone then 

 occupies the ground just at the edge of the descent, and on 

 this side the valley, argillaceous schist, as before noticed, is again 

 the rock. 



264. It is now time to consider the granite beds, and we may 

 do so in the most regular manner, as well as fill up some details 

 still wanting in the schists, by pursuing a line from Chumpawut 

 to the point where we left off in Art. 231. This route forms almost 

 a straight line, and it is singular enough, that it is parallel to the direc- 

 tion of the mountain land and of the strata, as may be seen by examin- 

 ing the map. Such a coincidence, to say the least, is curious, and cannot 

 fail to excite in a speculating mind a desire to trace in this common 

 relation, some evidence of a community of origin. At Chumpawut, the 

 most eastern of our beds of granite makes its appearance. It would 

 seem to be precisely the same rock that in Cornwall is called granan, 

 being a loosely aggregated amorphous mass, with the ingredients and 

 structure of granite, but so soft, as to bear being dug like clay or 

 mould. It is remarkable for its great proportion of felspar, and small 

 quantity of mica. This soft ground is strewed over with large imper- 

 fectly rounded blocks, of a very hard and beautiful granite. It is of a 

 smaller grain than the granan, and much more crystalline. The felspar 

 is white, the mica black, and the quartz yellow or brown. The blocks 

 are sometimes observed to have a superficial layer or crust separating 



