stoliczka's nomenclature. 87 
The four highest of these represent well-defined lithological units 
each of which, with the exception of the Chikkim shales, has yielded 
fossils and can be referred with a fair degree of certainty to its European 
equivalent ; for this reason, and also since the same terminology has 
been employed throughout the Himalayas, Stoliczka's nomenclature has 
been retained. It has, however, been found necessary to discard the 
names given by him to the lower members of the group. 
The " Lilang limestone " included, according to Stoliczka, the 
whole of the trias then known in Spiti, that is to say, the beds included 
between the base of the muschelkalk and the base of the rhastic. It 
was subsequently found by Mr. Griesbach that the lower trias was 
well represented, while during the last few years it has been proved 
that much of Stoliczka's rhaetic belongs in reality to the upper trias ; 
and since most of the fossiliferous horizons of the trias of Spiti 
can now be referred to their European equivalents, the retention 
of the term " Lilang limestone " would be both superfluous and con- 
fusing. 
For similar reasons the term " P4rd limestone " has also been 
discarded, for it was supposed by Stoliczka to represent the rhaetic 
stage, but as no horizons have yet been found in Spiti which can be 
definitely referred to that stage, while the " Pdra limestone " includes 
both upper trias and lias, the term ceases to have any significance, for 
it represents neither a stratigraphical nor yet a lithological unit, both 
its upper and lower boundaries being undefined. 
In the case of the " Tagling limestone," the same difficulty arises. 
Stoliczka includes in that series a mass of limestone, 2,000 feet thick, 
underlying the Spiti shales. This must, therefore, include both the 
middle and lower Jurassic, and probably also the rhaetic, should this 
stage be represented in Spiti. It was divided by Stoliczka into two 
groups, an upper and a lower, the former of which presented the curious 
anomaly of a formation occurring in only two localities, between the 
" lower Tagling limestone " and the Spiti shales, which he stated at the 
same time to be conformable to one another. A recent examination of 
the " upper Tagling limestone " in one ot these localities— the Parang 
( 87 ) 
