Granitic and Palaeozoic Rocks, Dandenong. 115 



Selwyn's catalogue. In a paper published in the Proceedings 

 of the Royal Society of Victoria, vol. xiv., pt. ii., page 211, 

 Professor Gregory writes : " Mr. Ferguson has stated that there 

 is a gradual change from the ' granites ' to the Dandenong 

 ' traps ' ; but I have failed to find evidence of this, and Mr. 

 T. S. Hart, who examined the sections on the Gembi'ook railway, 

 tells me that wherever tlie two rocks could be seen together they 

 were both greatly decomposed. He says there was no sign of a 

 passage between the two rocks. This evidence is consistent 

 with tlie view that the diorites and the dacites belong to 

 different dates, and had independent origins." In a footnote 

 Professor Gregory adds : " Since the paper was read I have 

 examined the sections in question, and agree with Mr. Hart's 

 conclusions." In the same paper (page 201) are given analyses 

 of two porphyrites and a granodiorite from two miles north of 

 Dandenong township, and a Dandenong dacite ; the analyses 

 were made by the then Government Metallurgist, Mr. H. C. 

 Jenkins, A.R.S.M. 



IV. — Geological Structure. 



Near Oakleigh the lower palaeozoic rock is a soft, yellow mud- 

 stone, containing no fossils, and having a dip of about 18° W. The 

 beds continue to the east without any change, except that of dip, 

 as far as the Stud Road running north from Dandenong. On the 

 west of this road the dip is constant for about three miles, and is 

 35" E.; it does not correspond to the surface formation, which 

 seems to be due to erosion. About four miles north of Dande- 

 nong the Lysterfield Road, running east and west, crosses the Stud 

 Road. On the south side of tliis crossing, for about a mile along 

 the Stud Road, the lower palaeozoic rocks are exposed by road cut- 

 tings. The rock has the san)e appearance as that near Oakleigh, 

 and the dip varies from 26° to 36° in directions between N. and 

 and E.; the dip of the beds in these cuttings, and in all the other 

 places where it can be seen, is nearly always towards the granite 

 area and never away from it. The dip is very variable, and about 

 a mile south of the Lysterfield Road there are some faults exposed 

 by a shallow road cutting. On the east side of the Stud Road, 

 on the Lysterfield Road, are a few cuttings showing lower palaeo- 



8a 



