JURASSIC SYSTEM. S5 
lying between the quartzite series and the horizon of Stephanoceras 
coronatum must include the uppermost trias, rhaetic and lias. In 
the present state of our knowledge of these beds it is impossible to 
attempt any more detailed subdivision. 
The highest beds of the limestone, immediately underlying the 
Spiti shales, represent the upper part of Stoliczka's 
Jurassic limestons. „ ", t> ,. ,. ^ j. l 1 r j 
" lower Taglmg limestone, which he referred 
to the lias. Fossils are numerous, consisting chiefly of belemnites, 
bivalves and gastropods. The recent collections have 'not yet been 
worked out, but in view of the fact that the limestone underlies, with 
perfect conformity, the Spiti shales, which have been proved by Uhlig 
to be of uppermost jurassic age, there is prima facie evidence for 
referring it to the upper jurassic and possibly upper part of the 
middle jurassic. 
Upper Jurassic. 
The Spiti shales are too well known to require more than passing 
mention ; they have been fully described by 
Spiti shales. ,. , , • 1 • 1 • . 
Stoliczka who exammed them m their typical 
locality, in the neighbourhood of Kibber, Langja and Giumal, where 
they form rolling downs, capping the high limestone cliffs on the left 
side of the Spiti river. The specimens collected from the shales are 
now in the hands of Professor Uhlig by whom they are being de- 
scribed ; a portion of his manuscript has already reached India, and 
from this it appears that several of the species of ammonites show a 
tithonian and lower neocomian facies, and the Spiti shales must 
therefore be regarded as uppermost jurassic, and possibly in part 
younger. 
In addition to Stoliczka's original "jurassic ellipse,"' Spiti shales 
also occur along the higher ridges on the right side of the Spiti river 
and form a narrow strip running above Mdni, over the saddle of the 
Manirang, and on into Bashahr. 
Memoirs, G. S. I,, vol. V. 
( 85 ) 
