24 
THE TERRACES OF THE SWAN AND HELENA RIVERS 
AND THEIR BEARING ON RECENT DISPLACEMENT 
OF THE STRAND LINE. 
By M. Aurousseau, B.Sc. (Sydney). 
Lecturer in Geology, University of Western Australia, 
and 
E. A. Budge, B.So. (Tasmania). 
Science Master, Guildford Grammar School. 
( Bead 10th August , 1920.) 
CONTENTS. 
1 . 
2 . 
3 . 
4 . 
5 . 
6 . 
7 . 
8 . 
9 . 
Physiography — * 
(a) The segments of the Swan River 
(b) The Swan Coastal Plain 
(c) The Islands of Fremantle 
Geology — • 
(а) The crystalline plateau 
(б) The Guildford clays 
(c) Drift Sands 
The Terraces and Levels 
Notes on the profiles 
The cycles of erosion 
Correlation with the features of “ uplift ” 
(a) Of the Lower Swan 
( b ) Of Rottnest Island 
(c) Of the Swan Coastal Plain 
( d ) Of the Darling Escarpment 
Summary and Conclusions 
Literature 
Explanation of Plates 
Physiography . — Evidence of uplift has been produced from a 
number of widely separated places on the Australian coast. The 
Western Australian evidence has been summarised by Jutson (10), 
who, however, saw no direct indications of uplift in the Swan River 
District, though he had stated (9) that uplifts may have taken 
place. Woodward believed that uplift was in progress at Fre- 
