20 WAAGEN WYNNE : GEOLOGY OF MOUNT SIEBAN. 



It seems that the area round Sirban was subjected to great and 

 continuous disturbance during the long period' from the close of the 

 slate age up to that of the jurassics^ followed by a time of tranquillity, 

 during which the Spiti shales, the cretaceous and the nummulitic forma- 

 tions, were deposited. 



It would be highly interesting, if possible, to find out whether the 

 periods of disturbance coincide with the eruptions of the volcanic rocks 

 known to exist in the interior of Cashmere. 



In concluding this brief notice of the locality, we append a sketch 

 map taken from the Eevenue Survey of Hazara (Huzaruh) in order to 

 show the distribution of the different formations, mentioning at the same 

 time that as our object was to make out the succession when upon the 

 around, rather than to survey all the minute details, we have not sought 

 to map the boundaries with absolute accuracy as yet. The discrepancies 

 likely to exist are, however, so slight that this consideration has not pre- 

 vented us from indicating the general extent and positions of the series 

 to which the rocks have been referred. 



( 350 ) 



