88 W. G. WOOLNOUGH. 



with white quartz mostly in sheets under an inch in 

 thickness. 



In Bluff Knoll the quartzites are beautifully ripple-marked 

 and show current bedding. The latter structure dips almost 

 due east. The quartzite beds here are very little altered, 

 but the finer sediments are almost completely recrystallised. 

 The quartzites are somewhat in excess of the phyllites. 

 As in Ellen Peak, there is much quartz veining. Amongst 

 the foothills to the west of Ooyanarup the same charac- 

 teristics are encountered. The veining of the rocks with 

 white quartz is even more pronounced than it is on top of 

 Bluff Knoll. In Yungermere we have the same association 

 of quartzites and phyllites. The former are very little 

 altered, and are current bedded and ripple marked. The 

 latter are silky and minutely puckered. In the cliff just 

 below the summit of this peak, the alternation of coarse 

 and fine beds is very rapid so that the structure becomes 

 very thinly laminated. The quartzites are very strongly 

 jointed, and, where they occur in massive beds as they do 

 towards the western foot of the mountain, it becomes 

 extremely difficult to distinguish between this structure 

 and the dip of the beds. The amount of quartz injection 

 here, though still considerable, is less than that noted 

 further east. 



In the hill about a mile S.S.E. of Moingup Spring in 'The 

 Pass' the same general features are encountered, though 

 the quartzites preponderate. Current-bedding with a south 

 easterly dip is distinguishable, and the quartz veinlets are 

 quite saccharoidal, instead of being vitreous as they usually 

 are. In the upper portions of Warrungup the rocks are 

 mainly much puckered phyllites, sandy in places, with bands 

 of strongly current-bedded quartzites up to 18 inches in 

 thickness. Quartz veining is still a notable feature, though 

 it is less abundantly developed than in the rocks further to 

 the east. 



