112 HAYDEN : GEOLOGY OF TIRAH AND BAZAR VALLEY. 



No doubt a more detailed examination of the material will 

 increase the above list. The general character of the fauna, however, 



Productus limestone at °n ce proves that we are dealing with beds 

 forms, closely related to the Productus limestone of 



the Salt Range, and to it we must look for assistance in determining 

 the age of the rocks in which these fossils occur. 



Forms found in the 0f the nine species in the above list, four 



middle division in the i}jz,l 

 Salt Range. 



Camerophoria pinguis, Waag, 



„ purdoni) Davids., 



Rhynchonella morahensis, Waag., and 

 Terebratuloidea minor^ Waag., 

 are in the Salt Range, restricted to the middle division of the 

 Productus limestone ; two, viz.'. — 



Productus serialis, Waag., 

 and the genus Allorisma 

 Forms peculiar to the are found only in the upper division, while the 

 upper division. remaining three forms, viz. : — 



Productus abichi ) Waag,, 

 Eumetria grandicosta, Waag., 

 and Spiriferina multiplicata^ Sow, 

 occur in both the middle and upper divisions. Eumetria grandicosta, 

 however, is found also in the lowest division, and is therefore of 

 little value in determining the age of the beds in which it occurs. 

 On the whole, therefore, the species are indicative of an age 

 between Middle and Upper Productuslimestone, 



Age of the sandstone. m 



rather nearer middle, however. Where the 



sandstone is found in the river between Chura and the Bazar Valley, 



Higher and lower beds »t is both underlain and overlain by limestones, 



•also represented. ^ ne lower beds being those already mentioned as 



1 The identification of the species quoted as Spiriferina cf. multiplicata is doubtful, for it 

 differs from the type specimen in the greater fineness and larger number of its radial ribs, 

 while some of the smaller specimens bear a strong resemblance to S. verrucosa. 



( "2 ) 



