32 WYNNE : TRANS-INDUS EXTENSION OF THE PUNJAB SALT RANGE. 



neocomian fossil at the top of the Jurassic group in the dark-coloured 

 band as above described, but here at least, the group is inseparable stra- 

 tigraphically from the underlying formation. Its upper limits were as- 

 signed from slight appearances of unconformity between this zone and 

 the lowest eocene beds, appearances as strongly seen in one of the glens not 

 far to the west, to occur between the Jurassic limestones and this cretaceous 

 zone itself ; such local symptoms of discordance have, however, little value. 

 The black transition band at the top of the Jurassic beds is succeeded by 

 a thick layer of soft yellowish unfossiliferous sandstone which increases 

 much in thickness, but maintains otherwise the same general character 

 westwards. In many places, this band and the underlying Jurassic for- 

 mation occupy nearly the whole of the southern side of the Chichali 

 range beneath the eocene limestone. 



If the lower boundary of this cretaceous group is thus indistinct, 

 lying actually in the very bed with fossils of an older period, its upper 

 limits are no better denned in its most westerly exposures ; for quite 

 the same kind of light yellowish sandstones there, in the same position 

 with regard to the Jurassic group, enclose pebbles of alveolina-limestone 

 such as often forms the Kohat representative of the eocene formation and 

 cannot therefore be of cretaceous age. Here the whole sandstone zone 

 must be considered as intermediate between Jurassic and Siwalik, without 

 any appreciable limits as to the parts of it strictly referable to the cre- 

 taceous or post-eocene periods. 



9. The eocene group. — Where represented, this consists chiefly of 

 nummulitic limestone of the Salt Range character, a white hard com- 

 pact or nodular limestone often filled with casts of fossils, but rarely 

 affording any well-preserved specimens ; the lower part is in places sandy 

 or marly, sometimes a sandstone of a whitish yellow colour ; not unf re- 

 quently in others black alum shales and carbonaceous shales are present. 

 In some sections orange or greenish and olive calcareous and concretionary 

 sandstones with gray shales, overlying a limestone conglomerate band, 

 form the top beds of the group, and among these beds the sandy bands 

 sometimes contain nummulites. The whole aspect of this upper part of 

 ( 242 ) 



