xcviii Report of the Miner alogical Survey [No. 126*. 



casionally a perfect talcose schist, which oscillates, as the rock always 

 does, towards chloritic schist. A granitic mixture of hornblende and 

 quartz is also found in limited quantity, the type in fact of a green- 

 stone. 



218. At Boomot, which is situated on an extensive flat, we find the 

 rounded stones so often described, the flat being entirely composed of 

 them ; the height above the river is 200 feet, and the extent considera- 

 ble. The rock in situ is seen, however, at the third of the ascent, and 

 it is chloritic schist, which appears on the other side to pass into 

 greenstone slate. On the left bank a larger flat is seen, being upwards 

 of two miles long, and half a mile, or more, wide in the broadest part. 

 This is also composed of the same rounded stones ; these beds can 

 never have owed their origin to any body of water so limited in quantity 

 as the present supplies of this river; and besides these table lands 

 are in reality 200 feet above the present bed. There occurs here an 

 appearance which is of considerable interest ; there are two levels, and a 

 considerable difference between them in height, the lower table being 

 nearest to the river. This condition of things certainly reminds one of 

 parallel roads, as they have been called, in some of the glens in Scotland. 

 Similar appearances have been observed by Captain Hall in Chili. The 

 resemblance is the more interesting, because I believe it is now a ge- 

 nerally received opinion, that the latter owe their origin to the succes- 

 sive burstings of a lake, at distant intervals of time. 



219. On crossing the suspension bridge, a rock very like greenstone 

 slate is found, it passes into the chloritic schist observed below Boomot, 

 and through that, on this side, into a perfect talcose schist, of white, 

 yellow, and blue colours, &c. On the flat no rock is visible, but again in the 

 bed of the stream, which comes down from Dhunpore, the granite rock, 

 which I have called greenstone, is again detected, occasionally passing 

 into a greenstone slate. It contains nests of indurated talc or potstone. 

 The schists are always conformably stratified, that is, they dip to N. E., 

 but the greenstone is generally amorphous. The schistose rocks con- 

 tinue, often verging on chloritic schist, and interstratified with quartz 

 rock as far as the route lies in the bed of the Nullah, which is of great 

 depth and narrowness, the sides of mural steepness laying open, in 

 beautiful natural sections, all the particulars of the rock worthy of 

 notice. 



