120 BLANFOHD : GEOLOGY OF WESTERN SIND. 



southern spur. The low anticlinal of Khirthar limestone, which joins 

 the Badhra to the Khirthar range, is but 1 \ miles across, but it forms 

 the water-shed between the Naegh valley and that of Pokran ; the 

 latter, it should be added, is drained by water-courses running to the 

 Baran river. 



Near Pokran, upper tertiary beds appear at each side of the valley, 

 Neighbourhood of the middle being formed of lower tertiary rocks, 

 principally Nari. On the western side of the 

 camping ground there is an anticlinal formed by an inlier of Khirthar 

 limestone, containing Numrmdites obtusa, &c, and appearing along the 

 top of a ridge, on the flanks of which the brown Nari limestones with 

 the usual Foraminifera and Pecten labadyei appear. Here also, north 

 of the water-course which runs past the camping ground, the bed con- 

 taining the large Ecliinolampas is well seen, and this band is frequently 

 exposed in the country between Pokran and Chorlo. Near the road 

 shaly calcareous grits and ferruginous sandstones are seen, and many 

 Gasteropoda and some corals occur. Farther eastward, soft sandstones 

 come in, belonging to the upper Nari horizon. 



South of the camping ground, there are several isolated conical hills 

 of black ferruginous gritty sandstones belonging to the Nari group, 

 and capped by subrecent conglomerates, a mass of pebbles partly cemented 

 together by carbonate of lime. These subrecent conglomerates, it 

 should be noticed, are largely developed in this neighbourhood, and are 

 often found left isolated by denudation at a considerable elevation above 

 the flat ground of the valley. 



In the plain to the east of Pokran, Manchhar beds come in ; a thin 



,,,„„, band of Gai, only a few feet in thickness, but 



East of Pokran. ... 



containing Ostrea multicostaia and an abundance 



of a large oyster, intervening between the Manchhar and Nari 



groups. The Manchhar rocks extend hence to the south-west, along 



the eastern side of the valley. At the foot of the eastern hills all 



the beds are turned up very sharply, and the Khirthar limestone 



crops out. 



( 120 ) 



