Geology of Warrandyte Goldjield. 533 



The Waprandyte Goldfield. 



(a) Geological Structure. 



The main features have already been indicated under the 

 geological structure of the whole district. To briefly recapitu- 

 late, there is a great anticlinal fold (the Warrandyte Anti- 

 cline), which has five minor anticlines, and four synclines on 

 its crown. The quartz reefs are intimately associated with these 

 minor folds, and as frequent reference will have to be made to 

 the latter, it is as well to use distinctive names. 



As mentioned above, the most westerly minor anticline is 

 really the northern continuation of the main axis of the whole 

 main anticline, and the next minor anticline to the east occu- 

 pies a similar position in the south. These minor folds have in 

 the description of the geological structure of the district been 

 referred to as the first minor anticline, and the second minor 

 anticline, respectively. The most westerly fold can be called 

 the Main North Anticline, and the next easterly anticline 

 similarly the Main South Anticline, both being parts of the 

 Warrandyte Anticline. It is in connection with the portions of 

 the folds at Warrandyte that the terms suggested will be 

 chiefly used. The short syncline between the two folds men- 

 tioned need not be named. Following the Main South Anticline 

 to the east is the Caledonian Syncline, then Thomson's Gully 

 Anticline, then a short synclinal axis, which requires no name, 

 then the Consols Anticline, then an unnamed short syncline, 

 and lastly the Fifth Hill Anticline. The names used (except 

 for the first two anticlines) signify the reefs or physical features 

 with which the folds are respectively connected. The enlarged 

 map of Warrandyte shows the directions and lengths of the 

 folds as traced. 



The general relations of the minor folds to the major one 

 have already been discussed. It will be noticed that the three 

 anticlines east of the Main South Anticline tend to approach 

 the latter and one another as they are followed to the north, 

 and also that from west to east they become shorter at their 



