524 ./. T. Jatson: 



The Warrandyte Anticline extends, so far as my observa- 

 tions go, from Tunstall to the north-east corner of the Nillum- 

 bik Parish at Watson's Creek, a distance of twelve miles ; but 

 it does not consist of one unbroken axial line, nor does it retain 

 the great thickness of its septa, which, as already stated, exists 

 to the east and west of the axis at Warrandyte. 



Taking the minor folds of the crown of the anticline from 

 their western side, the first and second anticlines are the only 

 folds that can be traced any distance to the north or the south ; 

 and these really constitute the main axis of the great arch. Tlie 

 second one, which carries the main line of gold workings at 

 Warrandyte, may be followed to Tlmstall, where it becomes one 

 of several normal folds. Northerly it crosses the Yarra to the 

 west of the island, and is traceable further north to the large 

 bend in the Yarra near the Caledonia Mine. Here it may be 

 thrown to the east by a fault, and if so, as shown on the map, 

 its further course is short and it dies out altogether. 



The main axial line of the Warrandyte Anticline appears to 

 be continued to the north in the first minor anticline. This 

 commences a little south of the Yarra, and has been traced to 

 Watson's Creek at the north-west corner of Nillumbik Parish. 

 Its fui'ther extension has not been observed. From being a 

 minor fold at Warrandyte, it rapidly becomes a great anticline, 

 which does not however retain its geanticlinal features, nor 

 the great thickness of both limbs, as the section along the line 

 AB of the map' of the whole area shows. Between the axis of 

 this anticline and that of the Bulleen Syncline, a normal syn- 

 cline and anticline occur. The eastern limb has a thickness of 

 about 8000 feet, and its limit has not yet been determined. 

 This limb is disclosed in two splendid sections, about one mile 

 and one and a quarter miles in respective lengths, along the 

 Maroondah Aqueduct. The gap between these sections is filled 

 bv the dips available at Watson's Creek, and thus a practically 

 continuous section about three miles in length is obtained. 

 This section is remarkable for the great regularity and un- 

 broken character of the strata. This feature is ajDplicable to 

 the limbs of the folds in the district generally. Intense squeez- 

 ing has taken place fairly often, but it is as a rule restricted 

 to the axial lines, and generally to the anticlines. From casual 



