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



Continuity of the salt. — Where the ground is so much obscured, it 

 is of course difficult to say whether soluble strata of salt may not have 

 been entirely removed by infiltration of fresh water from certain local- 

 ities, and thus it becomes impossible to determine the presence or absence 

 of a continuous salt zone throughout the whole district. For the 

 same reason it may not be presumed that where the mineral is elsewhere 

 exposed, it has the same great thickness which it exhibits at Bahadur 

 Khel, and it is quite useless to attempt to speak with certainty of the 

 extension of the salt even from one exposure to another when these are 

 separated by any considerable distance, the probability that it does ex- 

 tend being of course increased as the exposures approach each other. 



Difference between this salt, that of the Salt Range, and other salts. — 

 The differences between the general characters of the Kohat salt and 

 that of the Salt Range are vastly more marked than the similarities 

 to be found between them, and the associated series in the two districts. 

 Among the former may be pointed out that the salt-rock here, wher- 

 ever traceable connectedly for any distance, forms one enormous stratified 

 deposit from top to bottom without alternation, with sharply defined 

 bands of (kuller) saline clay intervening between thick zones of purer 

 salt, as in the Salt Range. Another marked difference is that of colour, 

 nothing resembling the red or pink Cis-Indus salt having ever been 

 observed in this district. The bright-red gypseous marl of the Salt 

 Range has no representative here ; the clays most closely associated with 

 the salt and gypsum being gray like the salt itself. 



A deep blood-red, rather than scarlet, zone of clay in this Kohat 

 district, entirely different from that of the Salt Range, and sometimes 

 by its washing down discolouring the debris overlying the Kohat salt and 

 gypsum of a reddish tinge, occupies so far a somewhat similar place, 

 that in both cases the salt is succeeded by gypsum and the latter by a 

 soft red zone, but in the Salt Range the red marl and gypsum are more 

 closely associated, and may even alternate in thick zones, while the red 

 clay here exhibits plainly a distinct horizon of its own and contains 



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