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



Points indicating a general tertiary age for all the rocks. — If the 

 rocks above described be considered collectively as a great consecutive 

 series, there are some points connected with this to which attention may 

 be drawn as favouring the idea that the whole belong to the tertiary 

 period commencing with very early representatives of Eocene age. 



The apparent intercalation of some purple sandstone and clay 

 bands of the same aspect as those of the f Murree group ' with the 

 nummulitic limestone, (though obscurity exists where disturbance and 

 dislocation are so common,) would link the limestones to the beds above 

 as much as the sequence to be found at the junctions which have been 

 or will be described. Again, the red clay zone below the limestone, in 

 its general color and aspect, bears so strong a resemblance to the red 

 clays of the Murree group, that when accident brings the two into juxta- 

 position the clays are undistinguishable. 



The occurrence of gray and white banded gypsum, such as may be 

 found here, together with greenish -gray and red clays, often gypseous; 

 nummulitic limestone, &c, in the lower c Murree beds' of the Rawal 

 Pindi district, admitted to be Subathu, as well as the presence of gray 

 limestone beds with a peculiar lavender tint, and containing in both local- 

 ities only univalves or gastropoda of a discoid form, is an association of 

 similarities which, added to the prevalence of petroleum or other earth- 

 oil in both cases, forcibly indicates that the greater development of the 

 gypseous, saline, and calcareous series in this district belongs to the 

 same early tertiary, otherwise called Subathu, age. 



Leaving the difficulty of accounting for the absence of older rocks 

 aside where tranquil succession is apparent, as has been already pointed 

 out, we may infer from the presence of the red muds, purple sandstones, 

 greenish gypseous shales, gypsum, limestone, bitumen or petroleum, to- 

 gether with the evidence afforded by fossils and by salt in one case and 

 saline springs in the other, a prevalence or recurrence of certain conditions 

 at a period elsewhere known to be nummulitic, all tending to confirm 

 the idea formed on first seeing the rocks, and each point adding strength 



( W2 ) 



