180 WYNNE : GEOLOGY OF THE SALT RANGE IN THE PUNJAB. 



the ground is often concealed by debris, does not seem to repeat the series 

 regularly. From anterior or subsequent landslip portions of the same 

 limestone mass rest on different groups of the older rock. 



The thickness of the salt beds mined at Sardi does not seem to be 



known ; one bed of W feet, with a north-westerly 

 Salt. 



strike, is mentioned by Dr. Warth; another of 



the same thickness, but of bad salt, dips at a steep angle to the north- 

 north-west ; while good salt above the latter is shown for some 40 feet, 

 and below for about 75 feet^ in thickness. There has alwaysb een diffi- 

 culty in working these mines on account of their low situation^ the 

 excavations leading downwards below the level of th^ stream, and con- 

 sequently rendering them liable to flooding. The small bi-pyramidal 

 quartz -crystals mentioned as occurring in the gypsum here by Dr. 

 Fleming {l. c. p. 351) were stated by people knowing the locality to 

 occur but very rarely. 



The sections on both sides of the gorge are very much the same^^ 



except that, at the head of the glen, the nummuli- 

 Sections. % , , 



tic limestone suddenly increases in thickness owing 



to the introduction of a quantity of soft marly beds below, nearly 



double the depth of the same group, at the sides of the glen, midway 



between the head and the mouth. That the group has not been reduced 



at the latter place to any great extent by denudation would appear from 



the occurrence of the conformable tertiary sandstones, &c., close to the 



edge of the cliff at the village of Sardi. 



The general section exposed in the glen where the rocks are not 

 confused by dislocation or concealed by debris is as follows : — 



Groups. Feet. 



No. 12. Tertiary sandstones close to the edge of cliff to the west of glen ? 



No. 11. Nummnlitic limestone, grey, compact, and lumpy, or marly 



below ... ... ... ... ... 250 to 400 



(Talus and debris, room for ... ... ... 150) 



r Shales and clays, light lavender or darker coloured ... 80 



No. 5. ^ Sandstones, speckled, ferruginous, and whitish, with red clay 



*- or shale bands ... ... ... ... 250 to 300 



( 180 ) 



