loS MIDDLEMISS: GEOLOGY OF HAZARA AND BLACK MOUNTAIN. 



felsite lying directly upon the quartzites and sandstones of the Infra- 

 Trias as in the Shakur Bandee glen, whilst beneath the deep 

 purple and white banded quartzite come purple and greenish shales, 

 and then the basal conglomerate in its unconformable position above 

 the slate series. There is no Infra-Trias limestone in the section at 

 this locality ; but Babu Hira Lai drew my attention to lenticular 

 bands of cherty material among the purple sandstones coming next 

 beneath the felsite which had a great resemblance to the cherty 

 bands in the limestone of the north fare of Sirban. If we take it as 

 plausible that these cherty layers have some connection with a 

 contact metamorphism induced by the felsite, then the occurrence of 

 this band in the quartzite is of considerable interest. 



West of Bazdar and west of the deep ravine coming south-south- 

 east down from the main peak of Sirban the hill-side exhibits a very 

 instructive variation from that first given, inasmuch as between the 

 purple and white sandstones and shales of the Infra-Trias there is 

 present a bed of pink sandy limestone a few feet thick, which is 

 followed by white quartzite and then by the felsite and haematite and 

 Trias limestone. The pink limestone possesses tbe characteristics 

 of the ordinary Infra-Trias limestone as seen on the north face of 

 Sirban. Its peculiar way of weathering in particular is of the same 

 nature as in the limestone sheeting the north face of Sirban. 



If we mount the steep craggy ridge traversing the section across 

 the edges of the Trias and the superposed Jurassic Spiti shales, with 

 a very small amount of grey limestone (Nummulitic) above them, we 

 are met by the huge dislocation referred to on page 128. It is a 

 fold-fault of much the same kind as the north Sirban fault, but its 

 extent is not so great. Immediately north of it the ridge joining the 

 higher summit of Sirban with the 4,070 feet spur near Mahmda 

 is peculiar in that the strike of the beds is almost north and south 

 for a short distance. The beds represented show the Infra-Trias in 

 force on the western face of the ridge with large thicknesses of the 

 limestone above of the white kind with cherty bands. This is covered 

 by the felsite and haematite, and that in turn immediately overlaid by 

 ( 108 ) 



