348 Albert V. James: 



15. E. J. Dunn. Mon. Prog. Rept. Greol. Surv. Vic, Nos. 8 and! 



9. 



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



XL, 19U. 



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 shows 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 

 spurred type of entrenched meander moves both horizon- 

 tally and vertically. 



Plate XXXIV. 



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

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

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

 spur ha-s been caused by the down -valley sweep of the- 

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



