72 
HAYDEN : GEOLOGY OF SPITI. 
which cephalopods predominate, and in the upper, brachiopods.^ This 
single horizon would then correspond to Diener's "horizon of Sibtri- 
tes prahlada " of the Shalshal cliff, which, however, should be placed 
above and not, as represented in his section, below the nodular 
limestone (see PI. IV). 
Above the horizon of Spirijerina stracheyi a band of limestone 
D J , , about two feet thick, contains Xenaspis sp. and 
Boundary between • 
upper and lower Ceratites aff. ravana, Diener. This probably 
m u scH d k 3,1 k . 
forms the highest horizon of the lower muschel- 
kalk ; it is overlain by the mass of limestone and shale which 
Upper muschelkalU constitutes the upper muschelkalk and which 
fossils. contains a very rich fauna, including over 65 
species of Ammonoidea. Of these, the most important will be found 
in the following list: — 
Ceratttes voiti, Oppe\. 
„ ravana, Diener. 
„ hidimba, Diener. 
„ airavata, Diener, 
„ dungara, Diener. 
„ vyasa, Diener. 
„ thuillieyi, Oppel. 
himalayanus, Bianford. 
„ horrid:is, Oppel. 
„ sp. ind. aff. Cer. wetsoni, Oppel. 
aff. trtnodosus, Mojs. 
„ aff. superbus, Mojs. 
„ aff. abichi, Mojs. 
„ aff. kamadeva, Diener. 
Japonites [Danubites) dritarashtra, Diener. 
„ n. sp. 
Trachyceras aft', longobardicum, Mojs. 
Acrochordiceras damesi, Noetlirsf. 
Isculites haiierinus, Stol. 
Joannites aff. diffisstis, v. Hauer. 
Meekoceras khanikoffi, Oppel. 
,, aff. proximum, Oppel. 
' Similar beds were subsequently found by Dr. von Kraftt in the Bambanag 
cliff in Painkhanda, where Spiriferina stracheyi occurs in the same bed with Cera- 
tites subrobustus and Monophyllites hara : a full discussion as to the correlation 
of the trias cf Spiti with that of other parts of the Himalayas will be found in 
Dr. KraHl's paper, which will form part 2 of this volume. 
( 72 ) 
