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



debris. The change however takes place in the direction of the strata, 

 and does not occupy 400 yards in lateral extent. The gneiss which 

 succeeds the quartz rock continues as far as Gokul, a village in the 

 same glen. In the ascent thence to the pass above Seras, the rock in 

 situ is not observable ; for a considerable distance fragments of horn- 

 blende schist are found, but not numerous ; after crossing the stream 

 a new rock is met with, which occupies some extent. It is a white 

 rock of a saccharoidal aspect, occasionally so frangible as to crumble 

 under the pressure of the finger, yet at the same time it has many and 

 distinct changes, but nothing like a schistose structure. It is most 

 probably a bed in the gneiss. It is composed evidently of talc and 

 quartz or felspar, or both; some parts of it have so completely lost 

 the mutual coherence of the particles, as to form apparently a bed of 

 white clay ; no doubt this would prove an useful ingredient in any 

 attempt to manufacture a superior pottery. 



134. On the summit of the Pass is to be seen a gneiss of an earthy 

 character, and containing not only clay slate, as an ingredient, but 

 carbonate of lime. Below the Pass occur fragments of chloritic schist, 

 in such abundance as to justify the suspicion that there are extensive 

 beds of it in the neighbourhood near ; the village, a compound rock of 

 an argillaceous character containing superadded carbonate of lime, im- 

 bedded pieces of quartz of a lenticular shape, and perhaps felspar; 

 most probably the transition of the earthy gneiss above to an argil- 

 laceous schist ; another specimen is a well denned clay slate with veins 

 of carbonate of lime, chloritic schist of a dull green colour, and sub- 

 granular composition, united to the imperfect schistose structure, also 

 occurs, after which quartz rock in all its types occupies the road in 

 the descent to the Tonse River, and for some miles in its bed, pro- 

 ceeding upwards : when I say in all its types, I mean rather of colour 

 than any thing else, for excepting in this particular there is no rock 

 which possesses such uniformity of character, at least in this tract. 

 It is sometimes bluish grey from clay slate, sometimes greenish grey 

 from chlorite. Occasionally it is talcose, occasionally micaceous ; the 

 dip is pretty uniformly from N. to N. E. and the inclination from 25° to 

 30° ; a very remarkable instance of the disruption of the strata occurs in 

 the descent, something like that noticed Art. 94. The interval is also 

 occupied by a stream, but of very disproportional dimensions. It is about 



