DAVIDSON THIBET BRACHIOPODA. 



35 



of the ridge, at the head of the ravine, in which valley I think that 

 the lowest beds will be found. 



The section given in fig. 10 was taken on the south side of the Yihi 

 valley, near the village of Loodoo, across a ravine beneath Was- 

 terwan Peak. 



rig. 10. — Section on the south side of the Vihi Vcdlei/, near tlie 

 Village of Loodoo. 



Above the usual basement-rocks, consisting of the Hornblendic 

 slate, of which a considerable thickness may here be seen, are 



feet 



1. Dark splintery slate and quartz-rock, with badly-defined lamination , . 20 



2. Light olive-green splintery rock, very compact, fracture cuboidal, like 2 



in fig. 5 ; 2 



3. Beautiful white or light-grey quartz, like flint 1 



4. Blue limestone, with beds which weather light-green 30 



This is bed 3 of fig. 3 ; contains the same species in great numbers. 

 The lower beds contain, or may be said to be made up of Fenestellaa. 



5. Dark-blue shales. 



These shales occur in the opposite side of the ravine, and are sur- 

 mounted by a great mass of hard compact limestone (l), weathering 

 to a red tint, and containing Goniatites. 



Note on some Carbonifekous, Jurassic, and Cretaceous (?) Brachio- 

 poDA, collected by Captain Godwin-Austen" in the Mustakh Hills, 

 in Thibet. By Thomas Davidson, Esq., E.E.S., P.G.S. 



(Plate I.) 

 § 1. Carboniferous Species. 

 The Carboniferous series in Thibet is stated by Capt. Godwin- 

 Austen to consist of: — (1) quartzites ; (2) limestones full of fossils 

 of all kinds ; (3) an argillaceous series ; (4) compact limestone with 

 fewer fossils, surmounted by a succession of beds full of Goniatites. 



The impure limestone (no. 2) is of a darkish grey colour, and 

 appears in some parts to be a mass of organic remains ; it bears much 

 resemblance, both in the character of the rock and in its fossils, to 

 deposits of a similar age in Great Britain. Prom this rock at 

 Shigar, near Skardo, Capt. Godwin- Austen has procured six or seven 

 species of Brachiopoda, of which four only are determinable, the 

 remaining two or three being too imperfect to admit of a satisfactory 

 determination. 



1. Terebratula Austeniana, spec. nov. PI. I. fig. 1. 



Shell almost circular, nearly equally and moderately convex ; sur- 



* Sect. C. 



d2 



