\ 
DIENER : TRIAS OF THE HIMALAYAS. 
Ft. In. 
11. Nodular limestone. . .60 0 ; (Niti limestone, Noetling). 
10. Calcareous shales . . .60; containing Rhynchonella Grieshachi 
Bittn. 
9. Shaly limestone ; containing Pseudomonotis himaica 
Bittn. 
8. Grey shaly limestones and 24 0 ; unfossiliferous. 
grey shales, alternating very 
regularly. 
7. Nodular limestone with very 5 7 ; with Hedenstroe.mia Mojsisovicsi, 
. thin shaly partings. Xenodiscus nivalis, Pseudosage- 
ceras mulilobatum. 
6. Grey shaly limestones . . 0 7 ; "> poor in fossils. No determinable 
5. Shales . . . . 0 10; J ammonites. 
4. Concretionary limestones and 3 0 ; very rich in Meekoceras, especially 
shales, M. lilangense and M. Varaha. 
3. Grey limestones . . .15; containing Ophiceras Sakuntala and 
Pseudomonotis Grieshachi. 
2. Sandy limestones weathering 1 7 ; no fossils, 
brown. 
1. Rusty brown, ferruginous 0 5 ; Ophiceras div. sp., Otoceras sp. 
limestone. 
Productus, or Ruling sliales. 
In this, as in several other sections, the band of grey shaly lime- 
stones and shales (5 and 6), from which no determinable ammonites 
have been obtained, marks a lithological as well as a faunistic boundary 
between a lower and an upper division of the sequence of beds which 
are exposed between the Permian Productus shales and the nodular 
limestone of the Muschelkalk. 
This boundary is marked even more strongly in the section S. E. of 
Muth, because the bands 5 and 6 there reach a thickness of four feet 
and are entirely unfossiliferous, whereas the ammonites restricted to 
bed 7 in the Lilang section occur throughout the entire series of thin- 
bedded grey shales and limestones (8) in the hills S. E. of Muth. 
It has therefore been found convenient to divide the lower Trias of 
Spiti into two divisions, the lower of these comprising beds 1 to 4 and 
reaching an entire thickness of 6 feet 5 inches only, the upper com- 
prising beds 6 to 10 and attaining a thickness of 35 feet 7 inches in the 
Lilang section. 
The genus Otoceras Griesb. is restricted to the rusty brown ferrugi- 
nous limestone at the very base of the series. Even here it is very rare, 
{ -^n ) 
