56 WYNNE : TRANS-INDUS EXTENSION OF THE PUNJAB SALT RANGE. 



It has here become plain that the whole Siirgarh range from near 

 Sdrgarh anticlinal Tandar Khel (north of Kalabagh) to Mitha, is but 

 ellipsoid. another example of the ellipsoid anticlinal struc- 



ture prevalent in the Kohat salt field. In this case the long narrow 

 anticlinal is bent nearly at a right angle at Mulla Khel, but both its 

 extremities — that north of Kalabagh as well as its termination near 

 Mitha — show the opposite curvilinear dips, where the axis of the curves 

 bend downwards at the convex ends of the ellipsoids, as described in the 

 Kohat country. It is not unusual there to find one side of an ellipsoid 

 cut off by faulting or much disturbed, and the same thing occurs here on 

 a larger scale. 



The remainder of the Maidan range to the southward, locally called 



the Darsoligarh, as far as the Kuram river, is 



formed of the thick Dangot Siwalik sandstones, 



with but one small exposure of the nummulitic limestone and Sabathu 



beds to the west of Isa Khel, the anticlinal axis continuing, together 



with its parallel dislocation, on the side towards the plains. 



So far as the escarpment is formed of hard rocks, the belt of detrital 



boulder-covered ground extends, but here, where 



the hills are chiefly composed of sandstones, hard 



fragments of any kind are rare, and their place is taken by banks of 



gray sand along the eastern foot of the chain. 



For some distance before reaching the Tangdarra, or last gorge of 

 the Kuram, the Maidan range sinks into com- 

 paratively low hills composed of the upper portion 

 of the Siwalik silvery gray sandstones, belonging to the western side 

 of the anticline. At the gap itself these beds dip to the westward at 10°, 

 and are succeeded by the usual upper Siwalik conglomerates ; these, how- 

 ever, not being so largely exposed as is their metamorphic-pebbly debris. 

 The strike of the range and its beds is here a few points east of south, 

 but just beyond the Kuram, the beds become nearly horizontal before 

 taking a south-westerly strike. 



( 266 ) 



