DESCRIPTIVE GEOLOGY : SLATE ZONE. 103 



small fault (obviously had the haematitic rock appeared in its normal 

 position here beneath e, this misconception would not have arisen). 

 The same error has been repeated in the section, figure 3, page 15, 

 where the haematitic breccia is represented as passing through the 

 middle of the Trias series. This anomaly, which puzzled Waagen 

 and Wynne (see page 17 of their memoir), does not really exist. 

 There is no trace of the felsite in the stream-bed section south-east 

 of Sulhud as far as I could see. It is true the bed is present on the 

 top of Sirban, and if the stratification of the limestone-cliffs be 

 followed from the summit down into the glen, the bed x would come 

 at about this horizon if it were really interstratified with them ; but 

 its unconformable position on the top of the Infra-Trias beds carries 

 it completely over the dip-slope on the northern face of Sirban in 

 the neighbourhood of Sulhud. It is caught again in a small fold 

 further to the north-east near Abbottabad, as will be made evident 

 in the section now to be described. 



The difficulties and anomalies of the Trias sections mentioned by 

 Wynne and Waagen at page 10 of their memoir alike vanish under 

 this interpretation. 



If we travel along the road from Sulhud to Abbottabad, we shall 



Sections east-north- find the S reat di P P lanes of the Infra-Trias gra- 

 east of Sulhud. dually subsiding into a gentle or almost hori- 



zontal condition near the foot of the mountain. The road winds round 

 the base of scarps and cliffs of this very characteristic rock. If we 

 stop on getting to the outskirts of Abbottabad near the new Octroi 

 office, we see the limestone standing up in horizontally bedded bluffs, 

 with a depression behind on the higher mountain slope. This 

 depression is the trough of a synclinal, and in it we shall find very 

 characteristic exposures of the felsitic rock of Sirban (see view of 

 Sirban from the north, PI. 6). 



On the near hill-side in the view of Sirban from the north, we have 



Sections near Abbott- the following section :— At the base the Infra- 

 abad * Trias is bent into a gentle synclinal, shewing 



innumerable bands of the cherty material parallel to the bedding. 



( »°3 ) 



