348 Albert V. James: 



15. E. J. Dunn. Mon. Prog. Kept. Gfeol. Surv. Vic, Nos. 8 and 



9. 



16. H. S. Summers. Proc. Roy. Soc. Victoria, vol. xxvi., N.S. Pt.. 



II., 1914. 



17. R. T. Patton. Proc. Roy. Soc, Victoria, vol. xxxi., N.S., Pt. 



II., 1919. 



18. A. V. G. James. Columnar Structure in Basalt and the 



Factors Producing it. Jour. Geol., 1920. 



DESCRIPTION OF PLATES. 



Plate XXXII. 



Geological map of the Bulla-Sydenham Area. 



Plate XXXIII . 



Fig. 1. — Type of kaolin deposit due to pneumatolysis. 



Fig. 2. — Type of kaolin deposit formed by the action of atmos- 

 pheric water and gases. 



Fig. 3. — Meanders of Deep Creek. The heavy line sliows the 

 present course of the stream; the dotted line indicates 

 the original course of Deep Creek. 



Fig. 4:. — Primary and secondary meanders of Jackson's Creek. 

 Ihe heavy line shows the present course of Jackson's 

 Creek, with both primary and secondary meanders, while 

 the dotted line indicates part of the original course of the 

 stream on the surface of the basalt (with primary 

 meanders). The large curves are primary, and are pro- 

 duced by the inequalities in the original land surface, 

 but the small meanders are secondary, and are due to 

 subsequent stream development. 



Fig. 5. — This diagram shows how the bed of a stream in the 

 spuri'ed type of entrenched meander moves both horizon- 

 tally and vertically. 



Plate XXXIV. 



Fig. 1. — Photograph of a spurred entrenched meander on Deep^ 

 Creek. Water-worn pebbles are found along the crest of 

 the spur. The flood plain on the down-valley side of the- 

 spur has been caused by the down-valley sweep of the- 

 meander. At the point x are the Eucalyptus Leaf Beds. 



