THE QUARTZ-HLATE MEMBER. 181 



At several places the Quartz-slate is in contact witli tlie Oliortv lime- 

 stone, and here a lar«>-e [tart of its (U'bris is from this loMcr member. It is 

 more fre<iuently in contact with the Southern Complex. At these contacts 

 true basal conglomerates are found. In one or two places at these contacts 

 iniconformities are nicely shown. 



The change to the overlying Iron-bearing member is always aljrujjt, 

 its nonfragmeutal rocks being found uj)on the vitreous (piartzite. 



The greater part of the material for the Quartz-slate member is derived 

 fi'om the underlying rocks of tlie Southern Complex, although locally it 

 contains material from tlie (Jherty limestone member. 



