Geology of Wdrravdyte Goldjield. 523 



The next fold to the east is that of the great syncline, whose 

 axis crosses the Yarra River between the Diamond and Mullinn 

 MuUum Creeks. It has been traced for the same distance and 

 l)et.ween the same boundaries as the Templestowe Anticline. 

 This structural feature has been named the Bulleen Syncline. 

 from the parish in which it is so well developed. It is a broad 

 fold, having a great thickness of rocks developed in its septa, 

 particularly the eastern one. From the axial line, the westerly 

 dip can be traced right into Warrandyte township, a distance of 

 four miles in a straight line. This septum forms the western 

 leg of the next great anticlinal fold, that already known as the 

 Warrandyte Anticline. 



This fold consists of one great arch, with five minor anticlines 

 and four minor synclines on its crown at Warrandyte. In this 

 district it is a geanticline, but this feature is not retained either 

 to the north or to the south. These minor folds comprise Pro- 

 fessor Gregory's "Warrandyte Fracture Zone," and scarcely 

 extend beyond Anderson's Creek, Parson's Gully and the Yarra, 

 except where one becomes the main axis to the north or the 

 south. 



The eastern leg of the Warrandyte Anticline has been traced 

 with a regular easterly dip from Warrandyte south-easterly to 

 a little to the north of Ci'oydon, a distance of about .3|^ miles ; 

 and may possibly extend farther eastward. In this limb the 

 amount of dip keeps fairly constant ; but in the western leg, 

 minor puckers and nearly horizontal strata occur, which indicate 

 lateral pressure of insufficient strength to form more folds. 

 At Melbourne Hill, near Warrandyte, on the old main road, and 

 on the main Warrandyte-road, just "east of Newnuan's-road, 

 miniature anticlines and synclines, and strata of low dip are 

 exposed. Rocks nearly horizontal also occur along the Yarra 

 west of Pound Bend, and in a series of quarries along Ruffley's 

 Creek. Tliese features however do not affect the general wes- 

 terly dip. The eastern limb of the Warrandyte Anticline is 

 generally of higher dip than the western in the locality under 

 consideration. The latter would perhaps average about 40 deg. 

 and the former about 60 deg. This would tend to incline the 

 axis to the west, which is what actually occurs at the Cale- 

 donia Mine, accordinjr to the survevs of the mine. 



