The Geology and Physiography of the Gosnells Area. 263 
Since pre-Cambrian times, a great thickness of sediments has been laid 
down in the trough west of the Gosnells area. In the Tertiary (Woolnough, 
1918) a laterite capping was develo]>ed over the peneplained surface of the 
pre-Cambriau rocks. The peneplain was uplifted (in af least two stages) 
and a small amount of subsequent erosion produced the present topography. 
VT. ACKNOWLEDGMENTS. 
The author wishes firstly to thank the Senate of the University of 
Western Australia, who granted him a Hackett Scholarship for the purpose 
of examining the area. He thanks the officers of the Lands and Surveys De- 
partment for making available data for the compilation of the map. To 
Pi’ofossor E. de C. Clarke and Dr. R. T. Pilder he expresses his deep grati- 
tude for many helpful suggestions in the course of the work, and for assist- 
ance in the revision of the text. 
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