98 



W. G. WOOLNOUGH, 



SLATE 



I.ONE FOOTi . 



Fig. 2. Sketch (to scale) showing contemporaneous erosion : 

 near the summit of Warrungup. 



In another place the beds are very much step-faulted. 

 The phyllites have given way by regular rock flowage, with 

 development of a decided cleavage, but the thin quartzite 

 layers have fractured more sharply and show evidence of 

 distinct, though minute, overthrust faulting. Such an 

 occurrence is illustrated in fig. 3. 



Fig. 3. Sketch (to scale) showing overthrusting and injection by 

 quartz : near the summit of Warrungup. 



In another place a more extensive movement has 

 developed incipient crush conglomerate, the thin quartzite 

 layers being shattered into fragments, which, more or less 

 rounded by attrition, are embedded in a ground mass of 

 crumpled phyllite. This zone is about twenty yards wide, 

 and, like the small fault of fig. 3, shows evidence of a 



