Physiography of Werrihee Area. 



283 



N.-S., and E.-W. dykes are numerous, some having been located 

 at the points where E.-W. valleys join the main stream. It is 

 natural to infer that the structure of the rocks has very greatly 

 influenced this creek, espec-ially as regards its N.-S. and E.-W. 

 ■valleys. It would appear from Fig. 33 that a second series of 

 fractures has also influenced the stream, running about east 47 °N.. 



\ 





^ 



U 



Ay^ 



\ 



Scale - Chains 

 40 



J I L 



80 



-J 



Fig. 33. " Drainage Network," of Hac.c Creek, Greendalo, sliowinor the 

 possible influence of the rock structure of the lower ordovician 

 rocks through which it flows. The strike of these rocks is ap- 

 proximately North, and lOast-West dykes and fractures are 

 numerous. 



