38 HAYDEN : GEOl OGY OF SPITI. * 
already mentioned [supra, p. 34) were found; as stated above, they 
are too badly preserved to afford definite proof of the age of the lime- 
stone, but it may perhaps represent part, at least, of the devonian 
system. 
With the exception of crinoid remains in No. 4, the overlying 
beds (2 to 5) have yielded no fossils, and their age is therefore un- 
certain. The two quartzites, Nos. 3 and 5, closely resemble the Muth 
quartzite, for which they might very easily be mistaken. They are 
seen in the Yulang river and again at Gyumdo E. G. on tlie left bank 
of the Spiti river, in the Tibetan province of To-tzo (or Tso-tso), where 
they and the accompanying limestones have been greatly altered 
by contact-metamorphism. Here they were supposed to represent the 
Muth quartzite, but the subsequent discovery of the series in the 
Lipak river proved that this correlation was erroneous. 
The third quartzite (No. 5) passes up into a series of limestones 
(6) with thin partings of shale. This subdivision is more or less fossili- 
rerous throughout its whole extent, but the beds have been often 
much crushed and folded, and the fossils are in many cases too badly 
preserved for identification. Certain horizons, however [a tog, PI. 11), 
were found, in which the fossils were in a very fair state of preserva- 
tion, and from these a large collection was obtained. 
Horizon [a). — The lowest horizon [a] occurs about 12 feet above 
the uppermost white quartzite (No. 5), and consists of a highly fossili- 
ferous band of rock of about 25 feet in thickness. The specimens 
obtained from this bed include the following forms : — 
Productus cora, d'Orb. 
„ semireticulatus, Mart. 
» sp. 
Chonetes hardrensis var. tibetensis, Day, 
Syriftgothyrts cuspidata, M art, 
Spirifer cf. kashmiriensis, Dav. 
» sp. • , • 
Strophomeiia analoga, Phill. 
Reticularia lineata, Mart. 
Athyris royssii. Lev. 
„ subtilita, HalK 
(7) Reizia sp. 
( 38 ) 
