28 HAYDEN : GEOLOGY OF THE PROVINCES OF TSANG AND t) 
granite mass of Pauhunri which sends out off-shoots across the head 
of the Khongbu valley to the edge of the Phari plain. They have 
consequently yielded no determinable fossils, although they contain 
numerous traces of bivalves and brachiopods. Boulders of a 
similar limestone are found in the valleys to the west of Chugya, 
among the moraines which form the lower hills extending to the Tang 
La and Pauhunri. These boulders are frequently fossiliferous, but 
no determinable specimens could be found in them. 
The shaly beds on which Phari Fort stands and an outcrop of 
^^imilar rock on the plain to the east of the Fort also probably belong 
to the Jurassic system, while the range running from the Tremo La 
to Chomolhari is probably composed in part of the same system, but 
this has not been definitely ascertained. 
The probable sequence in this area may therefore be summarised 
as follows — in descending order — 
7. Slate and shale. 
6. Upper limestone. 
5. Slate and quartzite. 
4. Crinoid limestone. 
3. Slate and quartzite. 
2. Coral limestone. 
I. Brachiopod limestone. 
Dothak series. 
(b) Tso Lhamo. 
This exposure of shale and limestone seen on the east side of 
Tso Lhamo, at the foot of the Drongkhya La, has already been 
described by Sir Joseph Hooker, who referred it with some hesitation 
to the Tertiary system, on account of the presence in the limestone of 
small bodies resembling nummulitesi; Sir Joseph Hooker, however, 
draws attention to the bad state of preservation of the specimens 
and leaves their identity open to doubt. 
^Himalayan Journals, \\ (1854), 177. 
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