HILLS NEAR SUKKUR AND ROHRI. 107 



Along the eastern edge of the hills south of Kohri there is nothing 



Eastern margin of hills. ° f im P ortance to record - F °r a considerable dis- 

 tance the boundary is easily traced, then sand- 

 hills, scarce for the first 20 miles from the river, gradually increase in 

 extent, until they cover the surface, and only occasional patches of rock 

 can be detected amongst them. The southern boundary of the rock area 

 is consequently very difficult to determine. Between the eastern Narra 

 and the Mir-wah, the large canal running to the west of the Kohri hills 

 the country, 50 miles south of Kohri, is a wilderness of sand-hills with- 

 out water. The few outcrops of rock which occur do not rise into ridges 

 as they do farther north, and the dips are very low, the beds being 

 almost horizontal. The map, too, is far from accurate. The southern 

 boundary of the rocks on the map is consequently only an approximation 

 but, so far as could be ascertained by enquiry in the country, no rocks 

 are known to occur farther south. 



The western boundary of the hills is, as already stated, escarped and 



Western margin of Wel1 defiued aS far SOuth as Kot D «k **<* beds 

 hms - of the scarp consisting of the easily decomposed 



white limestone with Nummulites. The clays below the limestones are 



first seen a little south of the Aror valley, about north-30°-east of a 



village called Dodanka. Near Trimmo there is what appears at first 



sight to be a channel cut through the hills, similar to that at Aror, but 



rocks occur almost throughout. 



About Akbarpur, south-east of Trimmo, the lowest bed of the num- 

 mulitic limestone is seen dipping at a considerable angle. It is clear 

 that the limestone is in position or nearly so, and does not consist of 

 reconsolidated fragments, because no debris of flints, or of the higher 

 beds of limestone, are intermixed. The dark calcareous beds, interstrati- 

 fied with the clays below the limestones, are often seen disturbed and 

 turned on end. In both cases the disturbance is doubtless due to the 

 washing away of the soft clays or to their having yielded when wet. 

 The limestones appear quite conformable to the clays. 



A little south of Akbarpur and north-east of Pir Koka, the fossi- 



( 107 ) 



