146 WYNNE: TRANS-INDUS SALT REGION, KOHAT DISTRICT. 



Fig. 39 is a reduced sketch of a rough survey from one side of the 



salt exposure to the other with the dips 

 Thickness of salt. r 



marked, from which it has been calculated that 

 the thickness of the salt at this place is from 1,000 to 1,230 feet, or even 

 more. Its stratification is almost everywhere distinct, and rendered more 

 evident by thin earthy layers alternating with the beds. Here the 

 dip is everywhere northerly — in the lower beds from vertical to 70° 

 declining to 50° or 55°, forming a bold half arch in the central hills, 

 again high after passing these, but gradually becoming lower to 30°, 

 where the last of the salt is seen. There are only two points, marked 

 a and b on the plan, where some curvature of the beds or disturbance 

 of the steady high dips occurs, likely to reduce the total thickness of 

 the section, and these curvatures appeared to be quite local, not being 

 traceable for any distance, but though the consecutive high dips follow 

 from bed to bed, the strike is not parallel throughout, a result which 

 may be due to pressure or even to concealed fractures or faults, though 

 no such features could be observed in this section, the only marked 

 divisional planes indeed, besides those of bedding, being some strong 

 nearly horizontal joints. 



The gypsum capping the central hills presents more difficulty with 

 Gypsum capping cen- regard to accepting the measured thickness of the 



tion S hl to the* Sof 'the salt as true - That to tne north succeeds the salt 

 as elsewhere with apparently perfect conformity. 

 The capping on the hills has the same arrangement as already noticed 

 to the west in the interposition of a greenish-gray clay band between it 

 and the salt, and there is, at all events, a certain amount of parallelism 

 among these beds. Still it is clear that if the salt beds to the north of 

 the hill were produced upwards, they would pass, even at a much lower 

 slope, far above the outlying patches ; hence, if the latter are conform- 

 able and in their original place, they must either have been embedded 

 in the great salt deposit, or else, being really the lower part of the 

 succeeding zone, the enormous thickness which the salt exhibits must be 

 ( 250 ) 



