70 
HAYDKN: GEOLOGY OF SPITI. 
As already implied, Dr. von Krafft also found the nodular limestone 
of Spiti represented in the Shalshal section by an exactly similar bed: 
this is No. 5 of Diener's section, hence his horizons (4) and (5) will 
correspond respectively with the horizon of Rhynchonella griesbachi 
and the nodular limestone of Spiti. 
Middle Trias. 
As stated above, the upper boundary of the lower trias, which had 
hitherto been drawn at the base of the horizon of Rhynchonella gries- 
bachi must now be placed somewhat higher up, at, or above, the 
middle of the nodular limestone. At present our knowledge of this 
bed is so small, and its fossil contents so few and so badly preserved, 
that no more accurate delimitation is possible. 
1 he following subdivisions constitute the middle trias of Spiti : — 
Daonella lime- 
stone 
Hard, black limestone, with Daonella lommeli, 
Wissm. ...... 
145 ft. 
Daonella shales 
Black, thin-bedded and flaggy limestone, with 
greyish-black calcareous and earthy shales, 
containing Daonella lommeli and cephalo- 
pods ..... 
1 60 ft. 
Upper 
Dark, concretionary limestone, with thin beds 
of dark shale, containing Plychites gerardi, 
Blanf. .... . . 
20 ft. 
Grey limestone with Xenaspis sp. and Ceratites 
aff. ravana, Diener ..... 
I ft. 4 ins. 
< 
Grey concretionary limestone 
6 ins. 
hi 
H 
(U 
Grey shaly limestone, with Spiriferina stra- 
clieyi, Salt. ...... 
4 ins. 
Muse 
6 
Grey limestone ...... 
3 ins. 
Hard, dark grey limestone, with Ceratites 
stibrobustus, Mojs., and Sibirites prahlada, 
Diener ....... 
4 ins. 
Thin-bedded, grey limestone and shale 
3 ft. 
Upper pari of nodular limestone 
( 
70 ) 
