Geology of Mount Macedon. 195 



An analysis of this rock is given on page 201. The 

 specific quartz is 2'78. 



(b) Cheniston. On the south-eastern slope of Mr. H. R. 



Hogg's house at Macedon is an outcrop of a similar 

 rock. The base is granulitic ; there is no trace of 

 fluxion structure ; plagioclase laths in the base are 

 scarce. The phenocrysts are more crowded than in 

 the rock previously described ; they include quartz 

 in small corroded crystals. Biotite is more abundant 

 and is often altered to chlorite. 



(c) South of the Schoolhouse. A rock (No. 26) similar to 



the last variety occurs a couple of hundred yards 

 south of the Upper Macedon schoolhouse. 



(d) Mount Towrong Spur. The rock exposed along this 



Spur agrees in the main with the Willimigongong 

 variety, but has more crowded phenocrysts and moi'e 

 abundant quartz. The rock at the summit of Mount 

 Towrong has many broken phenocrysts with the 

 angles of the fragments sharp and unworn. The 

 quartz contains many apatite needles ; the ilmenite 

 is in large hexagonal plates. The hypersthenes are 

 often deeply corroded by the granulitic base. 

 This spur ends to the north in a platform beside the 

 source of the Willimigongong south of the Camel's 

 Hump. A branch track runs eastward to Lady Car- 

 narvon's Tree from the main track between the Creek 

 and the Camel's Hump. The rock exposed near the 

 junction of the two tracks has several interesting 

 features. Parts of slides cut from it appear almost 

 brecciated from the abundance of angular, fragmen- 

 tary phenocrysts. The hypersthenes are large and 

 include plagioclase microliths. The ilmenite is some- 

 times surrounded by an aureole of biotite. Some of 

 the larger biotites are partially altered to chlorite. 

 The base is granulitic, and has no trace of fluidal 

 structure. 



(e) North face of Macedon. The Willimigongong type 



may be seen at many localities on the north face, 

 especially ai'ound Braemar ; at the foot of the north- 



