282 Charles Fenner : 



sections. The Korjainumnip flows south through older basalts 

 and glacial sandstones as far as the Ballan-Greendale road, when 

 a marked change is noted. The influence of the newer volcanic 

 sheet is apparent, and the valley is much deeper and narrower. 

 It is here known as Doctor's Creek. Landslips are very common 

 along the steep slopes, in the decomposed and " greasy " older 

 basaltic material that underlies the newer basalt. Beyond " High- 

 ton " the creek turns east, and receives Dale's Creek coming in a 

 similar valley from the north. A mile and a half further the Koro- 

 belt Creek comes in from the east, and here the Pyke's Creek 

 reservoir has been built, where the Melbourne-Ballarat road crosses 

 the valley. 



Thence onward the Pyke's Creek has a deep gorge cut into soft 

 tertiaries, hard glacials, and still harder granites and Ordovician, 

 to the junction with the Werribee. As shown in the profile diagram 

 (Plate XII A.), the lower part of Pyke's Creek is much deeper than 

 the parent Werribee, the possible reasons for which have already 

 been advanced. 



Dale's Creek flows south from near Green Hills, in the north- 

 ern ranges. Near its head the valley is wide and shallow, but 

 rapidly deepens. Just before reaching the scarp, it suddenly 

 turns eastward, leaving thick deposits of coarse fan delta material 

 piled up near the face of the scarp (eastern part of Garibaldi 

 Hill). This easterly turn may possibly be ascribed to capture 

 by another small stream that had cut back from the scarp face 

 and got into the soft material of an E.-W. dyke, such as are known 

 to abound in the area. Where Dale's Creek now crosses the fault 

 line, it passes into glacial sandstones, and the contrast in the 

 appearances of the valley above and below the fault is even more 

 marked than in the cases already mentioned. A wide dyke marks 

 the creek-bed juncton l>etween the Ordovician and glacials. Thence 

 to '' Glenpedder.'' the valley is wholly in glacial sandstones, with 

 small flats, and bounded by the rounded, grassy hills which mark 

 the village of Greendale. Opposite " Glenpedder " homestead a 

 high cliff occurs in the glacial conglomerates; below, as far as the 

 junction with Pyke's Creek, the valley is in older basalt, with 

 gently sloping sides. 



Back Creek is mostly in the ranges, since it joins Dale's Creek 

 less than a mile below the Greendale scarp. Messrs. P. B. Nye 

 and B. Listen, who surveyed this small stream, were continually 

 struck by the prevalence of almost right-angled junctions between 

 N.-S. and E.-W. vallevs. The strike of the rocks is almost due 



