tiBETAN FACIES OF THE HIMALAYAN TRIAS. 
In number of individuals Meekoceras joharense predominates. A 
fragmentary specimen of Meekoceras from the Hedenstrccmia beds of 
Banna, ejj. in Spiti, has been identified with this species by A. v. Krafftj 
although its state of preservation is too bad to warrant a safe identifica- 
tion. Xenodiscm nivalis and Hedenstrcemia cf. hyansica suggest a cor- 
relation with the Hedenstrcemia stage of the Himalayan series. Meeko- 
ceras jolinkense, which is also known from the chocolate limestone of 
Byans and from the horizon of Meekoceras lilangense in Spiti, points to 
the lower division of the Lower Trias. 
The fauna of the exotic block No. 20 is certainly of Lower Triassic age, 
although its correlation with the Hedenstrcemia beds as advocated by 
A. V. KrafEt cannot be considered to be established with full certainty. 
From the Chitichun area exotic blocks of Lower Triassic age have 
not been recorded. 
The fossils included in the exotic block No. 20 do not exhibit any 
affinities with the Alpine Lower Trias, but agree entirely with those from 
the Himalayan region. Local faunistic peculiarities, which have been 
mentioned by A. v. Krafft (I.e., p. 141, note) are of very slight impor- 
tance only. But there is a very sharp lithological contrast, the Lower 
Trias of the Tibetan series consisting of dark red limestone recalling the 
Hallstatt limestone in the Mediterranean region. 
b. Muschelkalk. 
The Middlemiss crag near Chitichun No. I (17,740 feet), consisting of 
a small number of blocks of a red or red and white limestone, contains 
a rich fauna of ammonites, which were described by C. Diener in 
1895.1 
In the following list such species only have been included as ad- 
mitted of a specific determination : — 
Ceratites (Danubites) Kansa Dien. 
,, ,, Ambika Dien. 
Sibirites Pandya Dien.^ 
1 Pal. Ind., ser. XV, Himal. i^oss., Vol. II, Pt. 3, The Cephalopoda of the Triassic 
limestone ci'ag of Chitichun. 
- The reference of this species to tlie genus Sibirites is accepted by E. v. Moj- 
sisovics with some reserve (Himalayan Foss., Vol. Ill, Pt. 1, p. 51). 
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