INTllODUCTOEY, 



13 



caused." In connection with this subject, a singular chocolate-coloured 

 argillaceous rock is mentioned as of somewhat " trappean-'^ aspect, occur- 

 ring where the junction of the marl and overlying purple sandstones 

 takes place, and supposed to be a " metamorphic argillaceous sandstone." 

 The greater number of the mines he thought confined " to detached 

 masses of salt, sometimes with horizontal or vertical lines of stratifica- 

 tiou, depending on their position at the time they became fixed in the 

 consolidating gypseous paste." 



At the time of his report, — in the years 1850 and 1851 respectively, — 

 768,603 and 64-0,618 maunds of salt were extracted, yielding a revenue 

 of Rs. 15,37,400 in 1850 and Rs. 13,81,295 in 1851, at a selling rate 

 of Rs. 2 per maund of 40 seers."^ 



Geological notices of Kalabagh, Musakhel, Kaffir Kote, Banu, the 

 Korana hills, and Murree, will also be found in the report. f 



* I. c, p. 248. 



t For the sake of comparison with other or the most recent classifications of the rocks,, 

 that of Dr. Fleming is appended. He recognised the following formations, which are 

 arranged in his tahle in reverse order, but are here placed naturally, the oldest lowest : — 



. Alluvium. 

 ( Greenish sandstones, argillaceous grits, con- 

 l- glomerates, and red and green clays. 

 r Brown calcareous sandstone, numniulitic lime- 

 X stone, marls and alum shales with lignite. 

 Cc. Green Belemnite sandstone and shales. 

 J b. Cherty thin-hedded limestones with shales- 

 / a. Yellow iron-stained quartzose sandstones, 



grits, and bituminous shales. 

 /'c. Upper limestone, sometimesmagnesian. 

 3 b. Grey sandstone and shales. 

 / a. Lower limestone, calcareous sandstone, 

 and shales. 

 d. Upper red variegated sandstone, grits, 



conglomerates and clays. 

 c. Greenish micaceous sandstones and shales 

 with grey dolomitic (magnesian) sand- 

 stone. 

 b. Lower red sandstone and grit with con- 

 glomerate. 

 a. Eed marl with gypsum and rock-salt. 



( 13 ) 



POST TERTIARY Recent 



C Miocene ? 



3. TERTIARY 



2. SECONDARY 



Eocene 



Oolitic 



rCAEBONIFEEOUS. 



1. PRIMARY or 



PALEOZOIC 



1^ Devonian 



