EXPLANATION OF PLATES. 
Plate 1. ... 
Plate II. ... 
Plate III. 
Plate IV. ... 
Plate V. ... 
Plate VI. ... 
Plate VII. 
Plate VIII. 
The Helena Valley, looking South from Guildford, 
A, on map. Shows anabranches, and terraces in 
the distance. E.A.B. photo. 
The Swan Yalley, looking North from Mr. Harper's 
house. B, on map. Shows width of present flood 
plain, and terraces in distance. E.A.B. photo. 
'The Swan Valley at Upper Swan. C, on map. Shows 
present flood plain. Caversham level (house on sky- 
line), slip-off terrace (behind haystack), and West 
Midland level (in front of haystack). M.A. photo. 
The Guildford beds and Darling Range, from Upper 
Swan. I), on map. M.A. photo. 
The Rottnest Shell Banks. Between Garden Lake and 
Lake Herschell, Rottnest. M.A. photo. 
Present Marine abrasion at Rottnest. Undercut lime- 
stone West of diving pool. The man is standing on 
the reef. M.A. photo. 
Map of the Guildford District. 
Profiles (to scale) of the Valleys of the Swan and Helena 
Rivers. 
