NUMMULITIC. 107 



mated at a hundred and fifty feet^ becoming nearer three hundred feet 

 towards the Indus. The limestones from various measurements and esti- 

 mates have throughout most of the range a thickness of four hundred 

 to five hundred feet, becoming thicker to the west, tliinner on the eastern 

 plateau, and disappearing entirely in the hills between the meridians of 

 Bhaganwala and Jalalpur. The whole group is absent from the series on 

 Chambal Mountain (east)^ and north-by- west of Jalalpur, but a narrow 

 band of the limestones re-appears upon the northern slopes of Mount Tilla. 

 The group is more largely represented upon Diljaba Mountain, termiu- 

 • ating with dislocations in the Ghoragalli pass ; and a faulted mass of 

 these beds is seen again upon the Bakrala ridge over Domeli. At the 

 western part of the eastern plateau these nummulitic rocks are discon- 

 nected by denudation and faulting from the rest of 

 Extension. 



their mass, but from the Choya-Saidan-Shah valley 



they extend continuously throughout the remainder of the range as far 

 as Khyrabad, several outlying portions occurring to the southward of the 

 main exposure. Beyond Khyrabad these rocks are involved in the 

 great dislocation which prevails, and they disappear entirely with the ex- 

 ception of a narrow faulted rib in the outer hills close to Mari on the 

 Indus. 



This NumrmiliUc group of the Salt Range differs in many respects 



„.„ „ ^, from the nummulitic limestones of other parts of 



Difterence iroui other ^ 



nummulitic limestones. \)^q northern Punjab, chiefly in the absence here of 

 interstratified thick zones of dark-coloured shale, in its being uniformly 

 of a light grey colour or nearly white, and, so far as seen, in never 

 assuming the black or dark colour usual in other places. The general 

 assemblage of fossils differs also, and the whole aspect of the group sug- 

 gests its having been deposited under circumstances different from those 

 which prevailed in the hill region to the north. In this direction it may 

 possibly be represented by the light-coloured limestones, which Mr. Med- 

 licott has identified as corresponding to part of his Sabathu beds, external 

 to and newer than the mass of the limestone seen in the hills. 



( 107 ) 



