DESCRIPTION OF SECTIONS. 24J 



At Pushtiwan, as in many other instances, the question is still 

 further complicated by the presence of basaltic dykes that cut 

 through both the acid and basic rock and are of later date than 

 either. Their intrusion has been accompanied by solfataric action 

 transforming their porphyritic felspars into a mass of finely granular 

 calcite, and the same action has extended for a distance of several 

 yards into the surrounding rocks ; this is especially well shown in 

 the specimens from the Malik Naro, -^fa, ^fy. 



The peak called Malik Naro occurs near the western margin of 



.. ... M the hills at present under consideration. It 



Malik Naro. m r 



rises to a height of 7,915 feet. The peak itself 

 and many of the hills to the south consist of quartz-diorites quite simi- 

 lar to those of Pushtiwan. The acid rock comes into contact with 

 basic ones which are probably also intrusive : these basic rocks 

 contain hornblende, but their structure is that of an augite-bearing 

 rock, the hornblende being of the nature of uralite. Later basic 

 dykes traverse both kinds of rock just as at Pushtiwan. 



South of the granitic intrusion of Malik Naro, the flysch form- 

 Butak and east of ation is again represented by bedded volcanic 



Butak< rocks whose considerable thickness indicates 



proximity to a volcanic centre. At Butak itself they are interbedded 

 with limestones to which an admixture of volcanic ash frequently 

 communicates brilliant hues and a porcellanic appearance. Some 

 of these limestones contain fossils, apparently lower eocene or upper 

 cretaceous, which are difficult to separate from the matrix (spec. 

 tW)- Here again the proximity of the volcanic vents is indicated 

 by the frequent occurrence of volcanic " lapilli" side by side with 

 the fossil shells. There are also a great many intrusive sills of 

 basalt and dolerite ; it is very difficult to decide whether these also 

 belong to the same volcanic system, or whether they are related to 

 the much newer set of bas*altic intrusions which everywhere inject 

 all the rocks with the exception of the Siwaliks. 



The dips observed amongst these strata are very low, the 

 structure being quite different from that of the highly folded ranges 

 previously described. The structure of the hills shows nothing but 



' ( 69 ) 



