NAHAN OEOUP. 109 



Being aware of the earlier notice of this break, I had sought along 

 the range for confirmatory evidence, and noticed the abruptness of the 

 change from limestone upwards to sandstone beds, but could never find 

 erosion of the lower rock, while I observed in the contact layer, where 

 present, a concretionary or nodular band rather than a regular conglo- 

 merate, though the latter occurred in the ascending section within 40 feet. 

 In the trans-Indus country I also paid considerable attention to the point, 

 and have described the junctions of the two groups in several places.* 



I have observed at this horizon as well as both below and above it 

 scattered pebbles of nummulitic or alveolina limestone. They were found 

 in the intercalated lower nummulitic sandstones trans -Indusf and at 

 different stages or horizons in the sandstone and clay aeries cis-Indus, but 

 in all cases accpmpanied by the same perfect parallelism of deposition 

 among the containing beds. 



Nahan Group. 

 No. 12. — The Nahan beds of this district have, comparatively speak- 

 ing, a limited exposure in the Bakrala ridge. They are the same beds 

 which I had observed to present a strong similarity to some of the 

 lower rocks of the north side of the Potwar, distinguished by me as the 

 " Murree beds/' Here at the Bakrala ridge they consist of purplish and 

 grey sandstones, interstratified with many bands of red clay, which give 

 to the whole group a reddish tinge; the sandstones are harder than those 

 occurring at higher places in the series. This strong similarity to the 

 red " Murree beds'' is not found to the westward, and the character of 

 the rocks appears to have changed laterally : many of the intercalated 

 greyer sandstones, &c., being, however, identical on the Bakrala ridge 

 and generally along the northern slopes of the Salt Range. Both the 

 redder and greyer rocks of the Bakrala ridge contain some bone frag- 

 ments and occasionally mammalian [Mastodon) teeth. 



* Mem. Geol. Suvv., India, Vol. XI, pt. 2, pp. 64, 65, 66, 91, 102, 105, 114, 116, 118, 

 120, 135, 159, 170, 176. 



t Rec. Geol. Surv., India, Vol. IX, p. 83. 



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