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



Cis- and Trans-Indus regions. The association of both of these red bands 

 with numnmlitic limestone favours the supposition of their being both 

 of numnmlitic age, though it is not sufficient to warrant the assertion 

 that they are on exactly the same horizon. 



Bone and other fossiliferous beds. — Near the top of this red clay 

 group a single or double layer of harder rocks may frequently be observed. 

 These are sometimes coarse purple sandstones, each seldom more than a 

 couple or three feet thick ; sometimes they are thinner, and concretionary 

 or pisolitic hsematitic bands, while in some localities they become thicker 

 and conglomeratic, containing also small fragments of bones, unfortunately 

 not likely to be of use in fixing their age. At a locality far distant from 

 where the bones occur, some layers with Nwnmulites were also observed 

 in these red beds not much below their junction with the overlying 

 limestone. 



These few traces of fossils are among the oldest and earliest traces 

 of existence in the whole of the Salt Region, the few fragments in a lime- 

 stone band at the top of the gypseous series being older, but neither being 

 in a state of preservation likely to convey any information as to age, and 

 in no other part of the red zone has any better fossil evidence been 

 found. 



Representatives, east and west, — From a passage in Dr. Verchere's 

 paper previously alluded to,* it might be surmised that the rarely 

 hsematitic layers of this group are developed more largely westward in 

 the country of the Waziri, furnishing the Waziri iron of commerce in 

 these parts. In the Salt Range to the east, the only representative which 

 can be suggested for the group is a band of red and white variegated 

 hsematitic clay of inconsiderable thickness, which occurs just beneath the 

 nummulitic limestone of the range. 



Thickness. — The thickness of this red clay zone varies somewhat, 

 being seldom small, and sometimes measuring over 300 feet or even 

 nearer to 400 feet. Two hundred and fifty feet, however, may be an 



* Jour., As. Soc, Bengal, 1867, p. 20. 



( 156 ) 



