526 Memoranda on the Geology of Sikkim. 



At the first deposit on Singreeong or cit Siugonong, as that 

 portion of the mountain is called, on the road to old Sikkim 

 and Paymiontsu, we made no investigation 3 but at the second 

 deposit, which is higher up the mountain, I went round the 

 deposit and could discover no lime, but only at the place 

 where the calc tuffa is met with ; so unless the lime is brought 

 out of the bowels of the mountain by the water that percolates 

 through a store of it, it is difficult to conjecture where it 

 comes from. In all the instances the streams on which the 

 lime is met with, drain but a small portion of the mountains 

 on which they are found, as is evident by paying regard to the 

 divisions into which they are respectively broken. 



I believe active search would lead to the discovery of a 

 small lime deposit at Punkabaree on the stream that crosses 

 the road about half a mile below the Dak Bungalow ; up that 

 brook and under a waterfall some way from the road, Capt. 

 B. picked up a piece of tufaceous lime, but impure, as on burn- 

 ing it ran together, and would not slake. We afterward endea- 

 voured to penetrate beyond the fall in search of lime, but a 

 storm coming on, prevented our succeeding at that time, and 

 we never found an opportunity of renewing the attempt. 



In addition to these lime deposits, there is also found a small 

 supply of marl, I am told, on Goke hill, by the small Rungeet, 

 and in a straight line from Darjeeling to Chakoong lime 

 deposit : by the analysis of Mr. Piddington it is partly 

 magnesia and partly lime, and would it is likely form a good 

 enough mortar, if prepared for this purpose, but it is only 

 used for white-washing edifices by the Booteeas and Lep- 

 chas, and is not burnt for cement. 



A flinty slate is met with on Chakoong in masses on the 

 road to old Sikkim and Paymiontsu before mentioned ; we 

 also found flinty slate at the junction of the Munnaand Selim. 



On the great Rungeet river, at the end of Goke spur, clay 

 slate is met with, nearly perpendicular and in the direction 

 of the river's course, and the same rock is found at differ- 



