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



5. — The Nummulitic Ellipsoid of Jatta. 



This ridgy feature is connected with the range just now described, 



but evidently owes its origin to a different anticli- 

 Another anticlinal axis. . 



nal axis. It is about seven miles in length by one in 



width, and its harder strata, though faulted both longitudinally and across 



the strike, have decidedly anticlinal terminations at either end of the 



feature. The softer gypsum and rock-salt forming the interior of the 



curve are largely exposed, but the outer rim of limestone is incomplete, 



having been cut out by a fault at the valley of the Ismail Khel river on 



the northern side of the ellipse. 



Towards the southern side of this at both ends the superficial ex- 

 posure of the nummulitic limestone is largest, but 

 Limestone disturbed. . . 



between these points this limestone is on edge, 



showing many signs of disturbance, or almost disappearing owing to 

 dislocation. 



The tertiary sandstones surrounding and enfolding the limestone are 

 of the same character as those usually forming the lower part of this 

 series. The red clay band just beneath the limestone does not appear to 

 have the thickness it sometimes displays, but is seen in sundry places, and 

 the gypsum below is of the common dull gray and white kinds passing 

 Black gypsum and m places into very dark or a black bituminous rock, 

 associated with which are alum shales. Below all 

 the salt appears to conform to the general anticlinal structure ; it is of 



Anticlinal appearance the usual g™Y colour > but in certain localities near 

 of rock-salt. ^ e ^^ - g su ffi c i en tly bituminous to smell strongly 



of petroleum, a scent which may also be perceived slightly in some of 

 the apparently purest rock-salt of the quarries at Jatta. 



Near the road from Ismail Khel to these quarries and the Ismail 

 Khel river up to the slopes of the hills, softish, 



North side of ellipsoid. 



gray and purple sandstones and purple clays with 

 some very red zones of the latter are, as a rule, nearly vertical, dipping one 

 ( 230 ) 



