100 WYNNE: TRANS-INDUS SAT/T REGION, KOHAT DISTRICT. 



These black alum shales or sulphurous beds are situated close to the 

 top of the gypsum apparently, but within it and not far below the 

 nummulitic escarpment forming the crest of the ridge overlooking 

 Gunjully. The whole of the associated beds are here intensely disturbed 

 and thrown into sharp contortions, while immediately to the south a 

 reversed fault makes the tertiary sandstone and clays at their junction 

 with the massive white gypsum appear to dip beneath the latter. 



The shales are in places very carbonaceous-looking, and on their 

 weathered surfaces plates of selenite are lying, which have been ap- 

 parently weathered out from them. Chemical reactions seem to be 

 actively going on, the whole place emits sulphurous fumes, the pyrites 

 in the shales is mostly decomposed, and the alum on surfaces of the rock 

 acts strongly on one's hands. Native sulphur occurs on the sides of small 

 cracks in the shale, small portions of which were easily ignited by a lens. 



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