THE LAKI RANGE, ETC. 153 



but dipping north at a low angle, about 1°. The same bed re-appears to 

 the south-west, where also Alveolina occurs in it ; but no such rock was 

 observed in the sections north of Jungshahi, where, as will be shown in 

 the next Chapter, the Khirthar and lower Nari beds had probably been 

 denuded before the upper Nari strata were deposited. 



A subrecent calcareous deposit of some thickness is seen in the neigh- 

 Subrecent calcareous bourhood of Jhimpir Station, covering much of the 

 gnt near Jhimpir. high ground, and exposed in the railway cuttings. 



The same rock occurs near Meting. It is a calcareous grit and conglome- 

 rate, so compact in parts as to form a good building stone, and to have 

 been used in bridges and culverts on the railway line. The colour is 

 mottled pale blue, white, and red. In the lower ground this rock is 

 covered over with a thin but extensive layer of calcareous tufa (traver- 

 tine), and upon the latter are seen small thin patches of a dark gravelly 

 false-bedded conglomerate. At a large spring, about a mile south of 

 Jhimpir Railway Station, it is difficult to distinguish the overlying cal- 

 careous deposit from the Khirthar limestone, the only lithological differ- 

 ence being that the former contains quartz grains. 



In the tract of Ranikot beds south of Jhimpir the rocks are the same 

 Eanikot bed south of as those seen between that station and Jhirak, but 

 Jhimpir. ftiey are, as a rule, much less exposed. No ob- 



servations of any importance have been made on this ground. 



The isolated tract of raised ground surrounded by alluvium and known 



as Makli Hill, west and south-west of Tatta, con- 

 Makli Hill near Tatta. . . 



sists almost entirely of Alveolina limestone, thicker 



to the southward than at the northern extremity. The beds slope 

 gently to the west and south-west. At Pir Phatta, on the detached patch 

 south of the Baghar river, the dip is about 3/ or rather less to the south- 

 west. On the eastern scarp, below the limestones, yellow sandy beds 

 and some dark mottled clay are seen west of Tatta, and again near Pir 

 Phatta and Kuba Bibi Miriam. In one of these, a soft rubbly marl or 

 argillaceous limestone, the small variety of Nummulifes sjpira [N. tatta- 

 ensis, Operculi?ia tattaensis of Carter) characteristic of the Ranikot beds, 



( 153 ) 



