68 GEOLOGY OF THE SON VALLEY, ETC. 



collected from an important stratum occurring W.-N.-W. of Belawa 

 peak. Its colour is a pale shade of grey or greenish grey ; the 

 magnetite is scattered in little octahedra which give a peculiar 

 sparkling lustre to the hand-specimen. Under the microscope 

 the shapes of the magnetite crystals appear very perfect so that 

 the crystals must be of secondary origin. The specific gravity 

 is 2'S8. The true nature of the rock is difficult to decide : it is not 

 a lava, yet it always occurs in conjunction with volcanic rocks. 

 The following succession of strata, proceeding from north to south, 

 occurs in the neighbourhood of Belawa peak where the specimen 

 was collected : — 



A. Ordinary grey-coloured slates of the Bij awars. 



B. Fine-grained diabase (yVr). 



C. Jaspidious rock with magnetite (ytt)* 



D. Talc schist with crystals of pyrites (jVV)' 



E. Chlorite schists containing bands of diabase (yt$) an< ^ 



lenticular or elongated masses of limestone. 



F. Limestone. 



G. Chlorite schists, highly calcareous, and interbedded with 



diabases and melaphyres. 

 H. Slates similar to A, 

 The width of this outcrop is over 1,000 feet. From Belawa peak 

 eastwards it may be followed as far as Naogai without any great alter- 

 ation, and from this again up to Girwi, where however its thickness 

 has diminished. Neither the most western nor the most eastern points 

 observed represent the termination of the band. In the above series 

 all the rocks included between the slates A and H are undoubtedly 

 volcanic, with the exception of the variable limestone F, and this 

 peculiar jasper C. Yet this jasper is so intimately associated with 

 the volcanic rocks that there probably does exist some connection 

 between them. The chloritic limestones are of the nature of volcanic 

 tuffs. These peculiar jaspers may have been of somewhat the same 

 nature as the typical Agori jaspers, but mixed with a certain amount 

 of volcanic dust or other volcanic material 

 ( 68 ) 



