SOUTH-WESTERN PORTION OE KARACHI COLLECTORATE. 157 



composed of rounded fragments of nummulitic limestone, whilst the 

 Manchhar bed contains no nummulitic limestone, but the majority of 

 the pebbles are of fine grained brown limestone. The Gaj beds at the 

 base of Eri Hill, west of Bachani, are highly fossiliferous, and several of 

 the usual species have been found in them, including Femes cf . nonscripta, 

 V. cancellata, Cardium anomale, Area Jcurracheensis, A. cf. burnesi, A. 

 peethensis, Ostrea mulUcostata, Chama sp., and several Gasteropoda. 



A very good section of Manchhar beds passing down into Gaj, and 

 Section near Arab-jo- tne latter resting upon highly inclined shaly and 

 Thalia - rubbly limestones belonging to the upper portion 



of the Khirtbar group, is seen on the eastern side of the valley near 

 Arab-jo-Thana, about half way between Kajur and Bachani. There 

 are about 100 feet of the shaly limestones above the typical massive beds 

 of the group, some of which are arenaceous. These massive beds abound 

 in Alveolina sphceroidea, A. ovoidea, and Orbitolites. Several hundred feet 

 of limestones are exposed. 



In the Kambu range, to the west of the Baran valley, there is a 

 considerable amount of disturbance, as shown in the accompanying 

 sketch section (Plate VI, fig. 1). From the foot of the hills, there is, as 

 usual, a slope of detrital gravels and conglomerates to the middle of the 

 valley ; sections of these detrital beds, 40 feet and upwards in thickness, 

 being exposed in the ravines cut by, torrents. Only close to the range 

 are any upper tertiary beds seen, and these consist generally of Man- 

 chhars, although in places a very thin band of Gaj, with Ostrea mul- 

 ticostata, Placuna, and other fossils, may be detected; and in one or 

 two places beneath the Gaj beds some light grey sandstone was seen, and 

 a thin band with small Orbitoides, possibly indicating the presence of a 

 faint representative of the Nari group. The Manchhar conglomerate 

 dips at a considerable angle eastward, and is much coarser, in places 

 at all events, than the subrecent deposit overlying it. 



The Manchhar beds rest quite uncon form ably upon the white massive 

 nummulitic limestone of the Khirthar group, which dips at a high 

 angle, 50° or 60°, to the westward. The limestone appears to belong to 



( 157 ) 



