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HAYDEN : GEOLOGY OF NORTHERN AFGHANISTAN. 



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To the south of Saighan the conditions become more complicated 

 as we approach the region of the Hindu Kush and Koh-i-Baba. The 



same trend and the 

 same type of flexure 

 still prevail in Bamian 

 and Ghorband, but the 

 folds are more numer- 

 ous and more com- 

 pressed and faults — 

 in most cases over« 

 thrusts — add still fur- 

 ther to the complexity. 

 The intrusive granite 

 of the Hindu Kush 

 and Koh-i-Baba, while 

 obscuring stratigraphi- 

 cal details, tends to 

 define more clearly the 

 tectonic trend-lines ; 

 like the Himalayan 

 granite, to which it is 

 in all respects similar, 

 its intrusion, no doubt, 

 took place concurrent- 

 ly with the orogenic 

 movements that gave 

 rise to the mountains 

 in which it occurs, and 

 it forms the cores of 

 the flexures. 



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Both from a geographical, as well as from a geological, point of 

 view, the most important physical features are the Hindu Kush range 

 and the Koh-i-Baba, along the crests of which runs the line of water- 



