ASIA. 143 



Lower Tertiary Sandstones (Nahun? and Dugshai beds); Subathu 

 (Eocene), consisting of Xummulitic limestone at top and red clay below 

 (containing bands of sandstone and limestone, with Nummulites); 

 Gypsum ; and llock-salt. In one part the rock-salt is proved to be more 

 than 1000 feet thick; in other parts 100 to 300 feet of salt beds, 

 without any alternations of unworkable salt, are exposed, with the 

 bottom not seen. It is not known what underlies the salt in this 

 region. The author thinks that this salt is not the equivalent of that 

 of the Salt Kange on the other side of the Indus, the chief argument 

 being the absence of the 7 thick formations which rest upon the latter. 

 The gypsum, with some bands of clay associated with it, is 300 ft. 

 thick ; it occupies a larger area than the salt ; sometimes beds of lime- 

 stone are intercalated with it. The mode of formation of the gypsum 

 and salt, and the question of the extension of the salt beyond the 

 frontier, are discussed. Part 2 consists of a detailed description of the 

 structure of the country, illustrated by many sections, which show 

 great contortion and sometimes inversion of beds. Part 3 (by H. 

 Warth and A. B. Wynne) treats of the economic aspects of the 

 region ; it gives an account of the native method of working, a descrip- 

 tion of the mines and outcrops, and an estimate of the quantity of salt 

 existing. F. D. 



