A new Structural Model of the Southern Slopes of Kohat Pass, District Kohat, N.W.F.P., Pakistan: the Problem of North-verging Folds
Abstract
The Darra Adam Khel area has been affected by at least three phases of deformation from Cretaceous onwards. The central block was elevated by an early Cenozoic revolution and has since remained a positive area. Miocene rocks were deposited in linear depressions towards north and south of the block. A central problem in this area is north verging folds that are anomalous to the regional structural pattern. The chain of repetitions of Samana Suk and Chichali Formations towards the southern part of the area are neither due to tight folding nor repeated fault slicing, as is generally believed. Instead, there are relatively small, open and somewhat overturned folds developed within the southernmost limb of the main fold, during the last deformational episode, with Chichali Formation being preserved in the synclinal troughs only.
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