DIENEK : Tin AS OF TIIK HIMALAYAS. 
stage must, consequently, be included. A very marked decrease in the 
thickness of Middle and Upper Triassic sediments certainly takes place 
■"rom Johar towards Byans. Supposing even that the ladinic stage is 
completely absent, as we may infer from its reduced thickness in the 
Niti area, and that accordingly the thickness of the carnic stage 
amounts to 170 feet in the section of Kalapani, this is considerably 
inferior to that of the equivalent beds in Painkhanda and Johar. The 
proportions are expressed in feet : — 
(Spiti (maxinuun thickness) .... 1,290 feet. 
Painkhandta and Johar (maximum thickness) . 820 „ 
Byans. ....... 170 „ 
Fsa. II.— Section N. W. of Kalapani (Byans) (from A. v. KrafjCs diary) 
9. Megakitlon limestone- 
8. Shales with indeterminable an)monites. 
7. Grey limestone. 
(). Black shales with Arctsles. 
5. Tr<)i)ites limestone. 
1. Light grey limestone (Muschelkalk, ladinic and carnic stage) 
3. Chocolate limestone (Lower Trias). 
2. Prodnctus shales (Permian V 
1. White {iluartzite. 
( '319 ) 
