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



Mr. Mallet) ,* sending forth volumes of warm water which could have 

 floated over a denser saline liquid below (as previously observed), or it 

 may be possible that the ' mother liquor/ after depositing the salt, 

 may have retained a quantity of chloride of calcium, the accession to 

 which of water impregnated with sulphate of magnesia or soda would 

 have produced sulphate of lime, i. e., gypsum.f As with respect to the 

 salt, so in the case of the gypsum, the presence of much heat, at least 

 since the rock became impregnated with petroleum or bitumen, does not 

 appear probable ; on the other hand, the small quantity now present may 

 be but the residue of a larger supply already driven off. Hot springs 

 and so-called hot springs are not unknown in the Punjab now, and if 

 these were more frequent or more voluminous in bye-gone ages, their 

 existence might not be incompatible with the fact that latent forces of 

 disturbance still show themselves in the frequent earthquakes, one of 

 which was distinctly felt at Lachi during the examination of the district. 



All such views, however, infringe largely upon the regions of 

 conjecture, for which there is generally ample room when facts are 

 scarce. 



* On the gypsum of Spiti, Mem. Geol. Surv., Ind., Vol. V, p. 151. Hot - , springs are 

 also supposed to have aided in forming the gypsum of the Salt Range by Dr. Verchere, — 

 paper previously quoted. 



f Dr. Warth. 



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