518 J. T. Jufsoii : 



formation on the parish map and the completeness of Mr. 

 Moon's. 



The necessity of more accurate topographical maps being 

 prepared requires emphasis, as no entirely satisfactory detailed 

 geological work can be done without much more correct and 

 more complete maps. The various parish maps do not always 

 fit together, and in compiling a larger map one has to take 

 the mean of the discrepancies. 



Previous Literature. 



In 1855-56 Selwyn (1) examined the basin of the Yarra as 

 far as where Warburton is now located, and showed that the 

 bulk of the sedimentary rocks were palaeozoic (silurian), that 

 they had been thrown into a series of anticlines and synclines, 

 that auriferous quartz veins occurred, and that a conglomerate 

 and breccia (both fossiliferous) were found at Andersons 

 Cl"eek. His estimate of the thickness and relative age of the 

 various beds will be mentioned subsequently in treating those 

 subjects. The remarkable map accompanying Selwyn's report 

 will always be the basis for all future work in the Yarra Basin. 



In 1855 William Blandowski (2) briefly described and figured 

 some fossils from Anderson's Creek. 



In 1866 Selwyn (3, p. 12) referred again to the fossiliferous 

 breccias. The geological sketch section accompanying his re- 

 poi't showed the silurian beds from Yan Yean to Mt. Juliet 

 folded into a succession of anticlines and synclines. 



In 1893 Mr. R. A. Moon (4) made a topographical and 

 geological survey of a large area of the country to the south 

 of Wari'andyte, which is included in this report. From a 

 topographical standpoint this map is of great value. Every 

 gully and every hill and ridge are shown with great accui'acy, 

 and in traversing the country I could fix any position with the 

 utmost precision. Mr. Moon's available time was evidently so 

 absorbed with the topographical work, and with indicating 

 quartz reefs, that he was not able to deal much with the 

 general geology. No serious attempt was made to grapple 

 with the structure of the district (although he indicated a 

 probable Hue of anticlinal from Tunstall to near Warrandyte, 



