DESCRIPTIVE GEOLOGY : SLATE ZONE. Ill 



general position which the younger rocks of the Sirban hill hold with 



regard to the general structure of the mass. 



huflr^n ac°ross S the We will first consider the little outlier forming 



Sirban ridge through t h e top of the ridge. On the north-west side 



Nugukkee. " ° 



of the ridge the outcrop of the Jurassics is not 

 a very clear and defined one. This portion of the hill-side forming 

 the head of the glen going to Sulhud is much obscured by fields. 

 But proceeding in the direction of the two-tree hill, or rather to the 

 little gap to the south of it, where the north Sirban fault passes, we 

 shall gradually find the outcrop becoming more distinct. At the 

 point where it turns round towards the south-east face of Sirban the 

 Spiti shales are well indicated by the presence of a copious spring of 

 water (and a tree or two) which supplies the needs of the village on 

 the top of the two-tree hill and other little hamlets near. On and near 

 the pathway leading from the gap south-east of the 6,243 summit to 

 Nugukkee we cross a continuation of the same Jura-Cretaceous band. 

 It is here again marked by a spring of water, and the terraced fields 

 all round are tinged a dark colour by the degradation of the 

 shales. In all these outcrops of the Jura-Cretaceous there are ap- 

 parently all the ordinary members of the sequence present, although 

 there are many sections in other parts of Hazara which much better 

 show the nature and relations of these rocks. The dark shales are, 

 however, pretty generally visible, and the Gieumal sandstone may 

 easily be detected in blocks strewn about the slope in the near 

 vicinity of the shales, whilst the Cretaceous rock (always a thin band) 

 can only with difficulty be found here and there in isolated blocks 

 displaced from its in situ position. If we cross to the south side of 

 the outlier we are now considering, following the pathway to 

 Nugukkee, we shall see the Spiti shales lying on great bare surfaces 

 of the Trias limestone ; both of these formations being much puckered 

 and sharply folded as the head of the glen going towards Bazdar is 

 approached. In Horizontal Section No. I, I have indicated this 

 puckering and contortion as the formations come within the influence 

 of the north Sirban fault. Above the encircling outcrop of the Jura- 



( "i ) 



