6 GEOLOGY OP SIND. 



daloidal and contains agates^ and it has a slightly stratified appearance. 

 Only a few feet of thickness are seen. The sandstones resting upon it 

 do not appear to be in any measure altered by the contact. 



Below about 30 feet of solid trap, there appears, on one side of the 



Mohun stream (in which alone the igneous rock 



Trap in Mohun stream. , ,111 i tj • 



IS exposed), a shaly bed, perhaps an ash. It is 



this which tends to give the trap so markedly stratified an appearance. 



It is possible that this lower bed may be sedimentary, and belong to the 



same series as the variegated sands and clays above the trap, and that 



the latter is simply interstratified. So very small a section is seen that 



these questions must be left undecided for the present. 



Beyond the anticlinal the variegated sands and clays continue for 1 

 mile or 1^ miles to the west, then, just beyond the lower part of the 

 kot, the inner ridge crosses from north to south, parallel with the outer 

 ridge, and, like that, composed of alveolina-limestone resting upon the 

 sands and clays. In neither case does there appear reason to suppose the 

 existence of any fault between the limestone and the underlying beds. 

 Yet it should be noticed that, in neither case, is there any appearance of 

 the rubbly calcareous beds so rich in marine fossils which rest upon the 

 sands and clays of the Lynyan. 



The inner ridge slopes away to the west, a valley succeeds, and 



beyond that other limestone ridges are seen, which, 



however, I did not visit. They appear to consist of 



rocks dipping to the west, and, consequently, resting upon the limestones 



of the kot, but it is unsafe to depend upon such distant observations. 



The thickness of the beds seen at Runneekote was approximately 

 as follows :— 



Limestone, abounding in Alveolina ... ... 1,000 feet. 



Variegated sands and clays ... ... ... 1,300 „ 



Trap ... 20 „ 



