DESCRIPTIVE GEOLOGY: SLATE ZONE. 151 



weathering dirty orange-yellow. Although there is no trace of a 

 conglomerate which might be referred to the Infra-Trias basal conglo- 

 merate, it seems possible that the yellow, purple and variegated shales 

 may represent a portion of the Infra-Trias sequence. After about 

 500 feet of Trias limestone as he ascended the hill Mr. Edwards found 

 Spiti shales and Gieumal sandstone appearing at a little flat place 

 on the ridge about the position of the last " h " of Chumnukkuh, thence 

 striking west-by-south along the north face of the hill in a kind of 

 trough to the north-western spur of Mohar on the " m M of Chum- 

 nukkuh. The dip is 6o° north-west, and there must then be a refold- 

 ing back of the Trias beds between that line and the base of the 

 Trias on the " h " of Mohar. 



The mass of Trias forming this hill divides into two branches 

 about the position of the " D " of Deewal, one branch in a more or less 

 disjointed way going E.N.E. from Kiyaluh village, and one follow- 

 ing the Deewal ridge to a little north of the pass, and then con- 

 tinuing as a constricted band towards Kalabagh. At the point, to the 

 north of the pass, where the road to Mari mounts the ridge, the sand- 

 stone forming the base of the Trias is a very pronounced arkose, 

 almost indistinguishable from a granite in the hand-specimen. The 

 same was found about the " D" of Deewal by Edwards. 



The hill north of Naruh police station, unnamed on the map, 

 presents very similar features to the hill just described, with 

 the exception that the Jura-Cretaceous fold includes also a fairly 

 large slice of Grey limestone coming above it. Taking the 

 section across this hill in detail, beginning from the Naruh police 

 station, we find first of all next to the great fault which divides the 

 Slate zone from the Nummulitic zone a thin band of slates striking 

 N.E. by E. They are all of a greenish grey colour with bronze- 

 coloured joint surfaces and much splinted. Hira Lai found that 

 the base of the Trias resting upon the slates along this line of 

 strike was the same as near Deewal, and it indicates, therefore, a 

 normal overlie between the unconformable Trias and the slates. 

 Ascending from this line of junction towards the hill-top in a 



( 'Si ) 



