20 WYNNE: TRANS- INDUS EXTENSION OE THE PUNJAB SALT RANGE. 



found in their place a layer of conglomerate formed almost entirely of 

 limestone pebbles, but of such upper eocene alveolina-limestone as occurs 

 to the north, and not of the local nummulitic kind, showing that the 

 eocene beds in some parts of the country had been undergoing denuda- 

 tion in consequence of disturbance which took place previous to upper 

 tertiary Siwalik or pliocene times. 



This conglomerate of foreign eocene limestone debris is also found 

 resting conformably upon nummulitic limestone of the Salt Range type 

 in the Maidan range, and associated with such fossiliferous nummulitic 

 sandstones as are often found near the base of the Murree beds or upper 

 eocene group ; from this it may be argued that the disturbance which 

 perhaps limited the depositing area of the mass of the Murree beds took 

 place about the close of the period of the upper eocene limestones. 



Another case of disturbance and elevation may be traced in the 

 Pre-Siwalik or upper relations of the rocks at the northern and north- 

 eocene disturbance ? west gide of the feasor range . but whether this 



also may be referred to the same period as that just mentioned is not 

 quite clear. The Siwalik beds here rest on some magnesian limestones and 

 thick soft sandstones, both unfossiliferous, and if not of Jurassic, at least 

 of triassic age. The junction bed at the base of the Siwaliks is a conglo- 

 merate formed chiefly of palaeozoic limestones and older rocks derived 

 from the local sub-carboniferous beds. In a southerly direction near the 

 other end of the range, Jurassic rocks come in between the carboniferous 

 and Siwalik horizons, but all the intervening eocene and cretaceous beds 

 are wanting, while the lowest parts of these newer tertiary rocks pro- 

 gressively extend beyond the Jurassic ones, till they rest upon the older 

 formations, thus establishing a clear case of overlap. 



If the elevation of the carboniferous and triassic ground took place 

 Pre-jurassic disturb- in pre-jurassic times, all the overlapping beds as 

 ance - well as the Siwaliks would probably be conglo- 



meratic at their junction with the older rocks of the then-existing shore 

 line : this development of shore beds has, however, been only found at 

 the Siwalik junction, and for no great distance JErom the northern end 

 ( 230 ) 



