TREDIAN HILLS. 269 



eurves_, cut off above b}' a Hue iuclined to the east, coiueidiiio; witli the 

 base of a thick unconformable capping* of coarse eono-loraeratej chiefly 

 composed of limestone pebbles. (See fig. 54, Plate XXXI.) 



The sketch, fig. 53, Plate. XXX, will serve'to show how little stratifi- 

 cation generally appears in the marl, and how 

 Stratification of marl. . • i /> i t ^ ■ ^ 



strongly this shows itself when the thin-bedded 



dolomitic bands and shales are present. The nearly horizontal beds, to 

 the left over the salt-chowki, within a short distance further on in that 

 direction, become vertical and bent backwards upon themselves, as may 

 be seen at the edge of the Indus, where the vertical layers are cut across 

 by a horizontal plane. In places along this bank of that river, large 

 quantities of air or gas bubble up from under water, and a portion of 

 the sandy, hard, river-bed, when the water has retreated, sounds hollow 

 beneath the feet of men or horses, as if salt had been dissolved and 

 removed from below. 



The ground along the edge of the plains just outside the salt-hill 

 Plains side of the salt- ^nd the limestone ridge near it is formed of regu- 

 ^'^" larly stratified red and green sandy alluvium, or 



debris, perhaps taking its colours from the preponderance of the same 

 tints in the neighbouring tertiary sandstones, &e. The latter beds 

 rise above the side of the little valley of Mari, opposite to the salt-hill, 

 and indeed approach this hill within a few yards in some places. 



Ascending the River Indus from Mari, orange and brown clays and grey 



sandstones, some of which are very thickly bedded. 

 Up the Indus, 



alternate repeatedly, dipping to the east-by-north 



at 45°. About two miles up the stream the rocks are seen to be faulted ; 

 sandstone beds, alternating with redder clays, coming against those with 

 the brown or orange clays between. Further on near Dangot (called 

 DundhotJ cliffs, thick sandstones weather into cavities, and the cliffs 

 are formed of extremely thick-bedded grey sandstone, a few pebbles 

 occurring in thinner beds below. What could be seen of this magni- 

 ficent cliff, nearly 2,000 feet in height, appeared to consist entirely of 



( 269 ) 



