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



shaly layer 10 feet thick, not traceable far, and dipping south at 40°. 

 It looks like alum shale, but has no bituminous or sulphurous smell. 



The salt in these Jatta quarries seems disposed in a thick zone, par- 

 Rock-salt said to have taking of the general anticlinal structure of th e 



been worked through. i j • • ± i L j t .li • n 



place and rising to the westward. In this the 



whole of the quarries might be situated within a thickness of from 200 



to 300 feet if the salt were extended horizontally. There are no means 



of estimating the true thickness of such a zone, but quarries at different 



elevations show a depth of 15 or 40 or 60 feet o£ solid salt. In one of 



these quarries, and that one of the lower ones, though not the lowest, the 



single case in the whole district of their having ever, even by repute, been 



penetrated came to notice. Here at the f Thathara quarry' a e BrungwaV 



or quarryman stated that at one time long ago when the quarry face had 



not been worked back so far north, a bottom to the salt had been found, 



and that Sheenkoura (gray gypseous clay) occurred beneath. The 



statement, however, seemed doubtful, and even if true, an older working 



of the kind described in the appendix may only have been reached, and 



not the true base of the salt deposit, so that the workman's story may be 



taken with a considerable grain of the adjacent mineral. 



The whole of the salt appears to take the ground to the eastward, 



Salt taking ground to ana * a ^ ^ ne quarries an( i exposures occur within 

 eastward. a j egg S p ace than one mile in an east and west di- 



rection. At a short distance eastward, after passing the last quarry, 

 there are seen what look like two old pits or excavations in some black 

 alum shale overlaid by impure gypsum. The shale seemed to have 

 become partially burnt spontaneously ; it contained iron pyrites, much 

 iron oxide, and some coaly layers. One band in 



Salt, alum shale, and 



gypsum smelling of pe- the clay was crowded with small nummulitic 



shaped bodies composed of gypsum. The whole 



was disturbed, and the dip at one place shifted to the west of north 



at from 20° to 40°, the thickness exposed being about 15 feet. The 



( 232 ) 



