1869.] 



GEOLOGY AND MINERALOGY. 



235 



band of quartzite are alternating beds of whin and slate, the first- 

 named greatly preponderating. 



" The strata at Mount Uniacke, from the axis of the anticli- 

 nal, in which direction the section was made southwards, may be 

 represented as given below. 



" The cross anticlinal appears to be very gentle, so that the 

 outcrop of the band of quartzite, and consequently of most of the 

 leads, if no great dislocations have taken place, will be that of a 

 very long and narrow ellipse, much flattened on the south side 

 and bulgins; out on the north side. 



SECTION AT MOUNT UNIACKE. 



Axis of anticlinal to arseni- 

 cal group of leads 



Centre of twisted slates to 

 base of great quartzite 



Feet. Rocks. 



475 Alternating beds of whin 

 and slate with leads. 



Arsenical group to centre 

 of twisted slates 200 



band. 



Alternating beds af whin 

 and slate with leads. — 

 Twisted slates about 50 

 feet thick, and micaceous. 



110 Whin and slate. 



Great Quartzite Band . 380 



Dark coloured slates with 

 plumbaginous surftices in- 

 terstratified with bands of 

 " whin." 



20 



Very coarse at base, in fact, 

 a grit, with grains general- 

 ly as large as a mustard 

 seed, then gradually becom- 

 ing finer as it approaches 

 the summit, where it is a 

 very fine light-coloured 

 rock. 



Leads. 



Whin with thin bands of 

 slate — in the centre the 

 slates are twisted 775 



Leads. 



