66 WYNNE : TRANS-INDUS SALT REGION, KOHAT DISTRICT. 



layer of the limestone or to its place where absent from the section by 

 reason of general thinning out of the whole group. 



On the other hand, intimately associated with these evidences of 

 conformity, there may be widely observed in the sandstone beds near the 

 uppermost nummulitic limestone numbers of fragments, blotches, and 

 pebbles of the upper alveolina and nummulitic compact limestone, or at 

 least rocks exactly like these, and full of their fossils. The occurrence 

 of these derived fragments in situations where the strong upper limestones 

 have died away shows plainly that they must have come from some distance 

 however small, and the only way that suggests itself to account for 

 their presence without unconformity is that mentioned in the foot-note 

 to page 57 regarding the similar occurrence of such derived pebbles down 

 even in the basal portion of the nummulitic series. 



Whether the explanation there given be accepted or not 5 the fact 

 deserves notice, and, though considered insufficient to establish uncon- 

 formity here, it is not against a state of things approaching thereto 

 having existed, perhaps not very remote from the localities where the 

 enclosed pebbles have been observed at various parts of the district. 



These enclosed foreign fragments may be found over the whole 

 district in the situations described, and it is known that they also occur 

 in the same tertiary sandstone beds Cis-Indus in the Pot war plateau,,"* 

 and along the base of these beds on the northern side of the Salt Range, 

 Taking the whole broadly together, they may be said to range through 

 a country 7,000 square miles in area, in which the junctions of the 

 sandstone and limestone are repeatedly seen with the same conformity 

 as noticed in this district, and if any total unconformity or discordance 

 existed between the groups, it seems but fair to suppose that, along the 

 many miles of boundary traceable through a region extending for 150 

 miles with the strike of the rocks, some evidence of excavations or 



* Records, Geol. Sur., lnd., Vol. VI, p. 63. Somewhat similar rocks to those at 



the junction of the Trans-Indus limestone and tertiary sandstone are mentioned by 



Dr. Fleming at p. 353, and by Mr. Theobald at p. 670, of their papers on the Salt Range 

 already quoted. 



( 170 ) 



