114 Proceedings of the Roijal Society of Victoria. 



Westeniport.^ The Dandenong Creek forms part of the eastern 

 boundary of Selwyn's map, and as all the granite, except one 

 very small outcrop, is on the east side of the creek, the only 

 mention of the Dandenong plutonie rocks is : " These two rocks" 

 (feldspar-porphyry and syenite) "occur as narrow dykes cutting 

 through and upheaving the older palaeozoic rocks, the former 

 being on the south banks of the Yarra, and to the north of Mel- 

 bourne, and the latter near Dandenong." The land to the south 

 of Dandenong is described in the map as palaeozoic sandstones, 

 shales, clay-slates, etc. A dyke of "sienite" is shown crossing 

 the Dandenong creek, near Dandenong township. 



In the Report of the Geological Surveyor on the Geological 

 Structure of Victoria, 1855-56, Sec. 3, page 17, Selwyn, in his 

 description of the plutonie rocks south of the Yarra and east 

 of the Dandenong Creek, writes: "They have upheaved and 

 metamorphosed the palaeozoic strata on their flanks, and have 

 therefore been intruded since the deposition of the latter. 

 Whether the granite and porphyries are of different periods, or 

 only accidental modifications in mineral character of the same 

 mass is uncertain. They often appear to pass into each other, 

 but small isolated patches of the porphyry, as well as branches 

 from the mass, are found penetrating the granite, which is not 

 found similarly intruding in the porphyry ; and we might there- 

 fore imagine the porphyry to have been erupted at a period 

 subsequent to the formation of the granite. " The granite near 

 Dandenong is not descril)ed particularly in " Geology and 

 Physical Geography of Victoria," by Reginald A. F. Murray. 

 On page 27 he writes : " Among the areas represented as ' trap ' 

 on the Geological Sketch Map, the rocks in three, namely, those 

 of Mount Macedon, the Dandenong Ranges and Mount Juliet, 

 besides others of minor extent, appear to be intimately associated 

 with the ordinary granites, though the true relations of the rocks 

 have not yet been properly investigated." On page 28, Mr. 

 Murray mentions that specimens of "ternary granite" and 

 " syenitic prophyry " from near Dandenong, and of " micaceous 

 felspar trap," "felspar porphyry," and "syenitic felspar 

 porphyry " from the Dandenong Ranges, are described in Mr. 



1 Victoria. Votes and Proceedings, 1854-55, vol. i., pt. ii., p. 976. 



