Memoranda on the Geology of Sikkim. 525 



the Dak Bungalow where the road was originally laid out, 

 and on the Roklee or Rektee, three or four miles to the SE. 

 across the hills, and where there is a lick frequented by 

 the animals of the forest. Graphite is also met with near 

 the Joom lime deposit in slate, but whether in clay slate 

 or mica slate I do not know. We likewise met with it on 

 the Munna in mica slate, and a small trace of it was found 

 at Mungpo, between the Rieng and Rungzo, in clay slate. 



It is superimposed on the slate that we find lime deposits 

 on Chakoong and Sungreeong. These deposits are tufaceous, 

 and so far as I can conjecture or observe, if not original in 

 their character, they must be exudations from stores of the 

 material contained within the hill, and contiguous to the lo- 

 calities where these deposits are observed to occur. There 

 are of these deposits with vi^hich I am acquainted four, and 

 they are in each instance connected with streams of water 

 || which pass through them ; and in regard to three of them I 

 have made some search for co-existent, compact and primitive 

 limestone with which they might have a connection or relation, 

 but without success. In each instance, the stream leaves on 

 the stones it passes over, a covering of lime. At Chakoong 

 we followed the brook beyond the first deposit met with, 

 ^ and finding it still leaving marks of its character, we pro- 

 ™ ceeded onward to a second deposit, above which the indica- 

 tions of lime became feeble, though they still occurred; 

 but the conclusion we came to from the appearance of the 

 channel of the brook, compared with what we had passed 

 on our way upwards was, that we had got beyond the prin- 

 cipal store of the mineral. 



At Joom I followed the stream beyond any trace of lime, 

 and till I came to a debris of slate, and subsequently I pass- 

 ed repeatedly above and behind the deposit, though by the 

 same route, and could detect no apparent trace of lime in 

 any of the streams leading from the Joom face of the 

 Chakoong mountain to the great Rungeet river. 



