GEOLOGICAL FORMATIONS 49 



may be due to a change in conditions, the Khirthar being apparently a 

 deeper water deposit than the Kanikot group. 



5. Nari group. — The series of tertiary rocks above the Khirthar 

 nummulitic limestone is superbly developed and very well seen in the 

 hills on the frontier of Upper Sind, the culminating ridge of which is 

 known as the Khirthar. The names of the two tertiary groups overlying 



the nummulitic formation have consequently been 

 Derivation of name. 



derived from places in this range, and the Nari 



group takes its title from a stream 1 which traverses the lower portion 

 of the range, here composed almost entirely of Nari beds, for a consider- 

 able distance, and issues from the hills nearly west of Johi, and west-by- 

 north of Sehwan. The present sub-division comprises at the base the up- 

 permost bands of limestone containing Nummulites ; the species, however 

 (N. garansensis? and N. subleevigata?), being distinct from those so com- 

 monly found in the Khirthar sub-division, and the limestone itself being 

 Distinction from Khir- usually distinguished from that of the Khirthar 

 group by its yellowish-brown colour, and by beino- 

 in comparatively thin bands interstratified with shales and sandstones. 

 Several other fossils, too, besides the nummulites, differ from those in the 

 Khirthar beds. Not unfrequently, however, there is an apparent passage 

 from the white or greyish-white Khirthar limestone into the yellow or 

 brown Nari rock, and the two groups appear, in general, to be perfectly 

 conformable, but no intermixture of the characteristic species of nummu- 

 lites has been detected, and the division between the Khirthar and Nari 

 beds, wherever they are fossiliferous, can be recognised by the fossil 

 evidence. 



In some places the lower Nari beds consist almost entirely of brown 

 and yellow limestones, but more frequently the limestone bands are 



subordinate ; dark shales, and brown rather thinlv- 

 Mineral character. , J 



bedded sandstone forming the mass of the rocks. 



The limestone bands are often confined to the base of the group, and 



1 This stream rises close to the peak called Sulimani, and runs first north, then east. 



2 D'Archiac and Haime, t. c, pp. 101, 344, pi. iii, figs. 6, 7. 



3 Ibid., pp. 106, 180, pi. iv, fig. 8. 



d ( 49 ) 



