HILLS NEAR SUKKUR AND ROHRI. 105 



All these lower beds are more or less fossiliferous, but the fossils are 

 usually badly preserved. In the clays, impressions 

 of Leda, Cardium, and other bivalves are found. 

 The dark limestone contains casts of a Cardita or Area, whilst the rubbly 

 limestone furnishes Pinna, several bivalves like Lucina, tog-ether with 

 CeritMwm, Rostellaria, and Natica longispira, the last species, the only one 

 specifically identified, being common to the Eanikot beds. No numrnu- 

 lites nor other Foraminifcra were found, nor were any Echinodermata 

 noticed. 



A few additional details of the geology will be given in the following 



paragraphs. The description commences at the north end of the hills. 



The rocks at Sukkur form more or less detached hills, and dip at a 



very low angle to the east or east -by-north. To 



Sukkur. 



the eastward and capping the hills to the west- 

 ward is the hard yellowish limestone with flints : this rock is much 

 fissured, the fissures being filled with a mixture of gypsum and red clay, 

 which appears to have been deposited in the hollows. The band of 

 yellow marl is conspicuous about the middle of the European station. 

 The rock below this band is rather softer than above, and the flints 

 appear rather less numerous and smaller. Below the marl, after about 

 20 or 30 feet of comparatively harder rock, the soft limestone with 

 numerous nummulites is reached, and is well exposed on the sides of all 

 the hills near the Shikarpiir road. This bed weathers away so much 

 in parts that some of the layers overhang hollows left by the decom- 

 position of the softer portions. 



The western boundary of the rock area and the small outliers to the 

 westward are scarped and well marked, but to the eastward, where the 

 limestone dips at a very low angle under the alluvium, the limit is less 

 distinct. Rocks occur in one or two places on the Shahdad-wah, or Sukkur 

 canal, and there appear to be some rocks under water east of old Sukkur. 



A break intervenes between the hills, on which the European 



station is built, on the bank of the river, and 

 Old channels of Indus. ,- ■■ r> , i mi o i 



others a little further north. The first break may 



( 105 ) 



