SOUTH-WESTERN PORTION OF KARACHI COLLECTORATE. 181 



station. The Hatari stream, a small water-course, runs from the north- 

 east close by. The Nari beds exposed consist chiefly of sandy shales. 

 East of the road to Karachi (a continuation of the caravan road already 

 mentioned), massive sandstones come in, some of them containing marine 

 Passage between Nari fossils, such as Ostrea, Pecten, Orbitoides, &c. In 

 and Gaj groups. the Hatarf streanij the t ypi ca l light-brown sand- 



stones occur with ferruginous shaly bands, which are often brightly 

 coloured. Above these again is limestone containing a small Orbitoides, 

 Clypeaster, Pecten subcorneus, and Ostrea mtdticostata. Again, above this is 

 coarse brown sandstone, like that beneath the Gaj limestone of the 

 Miner plateau, together with finer beds of precisely the same characters' 

 as the Nari sandstones below. These sandstones are altogether 200 or 

 300 feet thick above the marine bed just mentioned, and are succeeded 

 in ascending order by the typical Gaj limestone, along the base of which 

 the boundary line between Gaj and Nari is drawn. It is evident that 

 this section shows a complete passage between Nari and Gaj beds, for 

 the marine limestones interstratified with upper Nari sandstones contain 

 none but Gaj fossils. 



Some miles south of Lohari Lang, and near Murad Khan's "band" 



(dam) across the Habb river, a thin bed composed 

 Gaj coral bed. 



of corals appears a few feet above the base of the 



Gaj group. This bed can be traced for many miles to the south. All 

 the species of coral (five or six) are encrusting forms or small branching 

 kinds. A Pachyseris, or some closely allied form, and two or three species 

 of Hydnophora, are especially common. In the Nari group below, the 

 bed with Pecten subcorneus is continuous. 



The outcrop of the Gaj beds here becomes comparatively narrow, 

 Marine beds in Man- owing to a considerable increase in the dip. 

 chhars at Hupkani. Opposite the "band" the belt of miocene rocks is 



rather more than 3 miles broad, but this diminishes to 1^ miles at 

 Mugger Peer. Nearly east of Murad Khan's " band," and about 16 miles 

 north-by-east from Karachi, there is seen a good instance of marine beds, 

 undistinguishable from those of the Gaj group, interstratified with the 



( 181 ) 



