AREA SOUTH OF THE SAFF^D KOH. I©7 



are very similar to the carboniferous rocks seen in the Khaibar 



and probably represent a part of that system. Between the two 



series of beds is a confused mass of broken slates, schists, and 



m „ . trias shales and grits. There can be little doubt 



The fault. ° 



that this fault continues for the whole length 



of the Ba*ra Valley, following more or less closely the line of the 



southern foot of the Surghar Range, and, passing on further west, 



it probably forms an important feature in the geology of the Safed 



Koh Range, eventually emerging in Kharwar and the Shutargardan, 



where Mr. Griesbach found it forming the boundary between the 



mesozoic and the palaeozoic beds. 1 



From the kotal the Surghar Range trends north-east, and with it, 



_ . the palaeozoic rocks, and on passing: eastward 



Trias at Swai Kot. , , , , , , 



from the kotal the ground once more slopes 



down to the BaVa River where only triassic beds are seen. On near- 

 ing Swai Kot, these are overlain by recent and sub-recent conglo- 

 merates, clays and gravels. Along the road from Swai Kot to Ba*ra 

 Fort the triassic beds are again well seen and form the small range 

 of hills running south-east from the Surghar Range to the Bdra River. 

 These rocks extend to within about 7 miles of Bara Fort, after which 

 the road passes down on to the gravels and alluvium of the Peshi- 

 war plain. 



It will, therefore, be seen that, broadly speaking, the Bira Valley 



„._„.. is a narrow trough eroded out of the soft 



The Bara Valley. , & 



triassic shales and grits, bounded on the south 



by a high range of (probably) rhaetic limestone, and on the north by 

 another high range composed of palaeozoic rocks. The beds to the 

 south appear to dip to the south, but except in the gorge between 

 Bcigh and Dwatowi, I was unable to examine the hills between the 

 Ba>a Valley and the Maiden -Wara*n trough ; nor could their struc- 

 ture be seen, for throughout the march down the Bara Valley they 

 were completely covered with snow. 



1 Op. cit.» p. 76. 



( 107 ) 



