BEDS OF THE TIBETAN CRAGS. t^ 



/. — In the Tibetan crags of the Chitichun region the presence 

 of the following rocks has been established. 



(a) White or reddish limestones of permian (permo-carbon- 



iferous) age, with a rich fauna closely allied to the 

 faunas of the Virgal and Kalabagh beds (middle 

 Productus limestone) of the Salt Range and of the 

 Artinski horizon of Russia. 



(b) Red limestone with cephalopoda of muschelkalk age, 



pointing to one of the lower horizons of the Dinarian 

 series. 



(c) Red limestone with cephalopoda of upper triassic 



(Carnian) age (subbullatus or aonoides beds). 

 The series (b) and (c) represent the Hallstatt development of 

 rocks' in the Indian triassic province. 



(d) Upper triassic (?), unfossiliferous limestone, correspond- 



ing in its stratigraphical position probably to the 

 Dachsteinkalk of the Austrian Alps and to Griesbach's 

 €( rhaetic system" in the Himalayas. 

 Among these rocks only the last-mentioned is developed with 

 similar characters in the Chitichun crags and in the main region of 

 the sedimentary belt of the Central Himalayas. The Hallstatt de- 

 velopment is not known in the latter region, where the triassic beds 

 have all been deposited as normal sediments, spread equally over 

 a large area. Nor have any equivalents of the permo-carboni- 

 ferous limestone of Chitichun No. I been discovered as yet. The 

 faunistic relations to the Productus limestone of the Salt Range are 

 remarkably closer than to any member of the palaeozoic series in the 

 main region of the Himalayas of Kumaon and Gurhwal. 



2, — The structural relations between the rows or zones of our 

 Tibetan crags and the principal Himalayan folds may partly be seen 

 from Griesbach's maps (Memoirs XXIII, 1891, and Records, XXVI, 



Pt. I., 1893). 



C ( 17 ) 



