The Coxtact Between the Granitic Rocks and the Cardui^ Series 
AT Armadale. 53 
7. Intrusion of the quartz dolerite series of dykes consequent upon 
earth movements affecting the Cardup Series. 
8. Formation of barite veins as end phase effects of the basic intrusions 
(galena-sphalerite-quartz veins also probably belong to this period). 
End of Pre-Cambrian. 
9. DoAvnwarping continuing and sediments being constantly deposited 
in the depression — the only evidence regarding this long period of 
geological time being the two thousand feet (at least) of Cainozoie 
sediments which underlie the coastal plain and cover up all inter- 
vening formations. Block faulting may have taken place (as sug- 
gested by Jutson, 1935, p. 469) during the uplift of the Western 
Australian plateau in late Miocene times but differential erosion 
of hard rocks of the plateau and the soft rocks to the west of the 
scarji seems capable of explaining the present physiographic 
features. 
V. ACKNOWLEDGMENTS. 
T desire to express my thanks to Mr. H. A. Ellis who suggested that the 
possibility of granitisation of the Cardup Series should be investigated and 
who was instrumental in having analyses of a number of the rocks made 
in the Government Chemical Laboratory. My thanks are due also to Mr. 
H. Bowley, Government Analyst and Mineralogist, for permission to publish 
these analyses. Chemical analyses made by myself in the Department of 
Geology were made possible by funds from the Commonwealth Research 
Grant and this assistance is gratefully acknowledged. I also desire to thank 
the Senior Students of the Lhn'versity Geology Department (Messrs. Crab- 
tree, Davis, Elvish, O’Driscoll, Telford and Thomson) who, under my super- 
vision, made the survey of the area as part of their field course. Finally 
I wish to thank Professor E. de C. Clarke for assistance during the revision 
of the text. 
VI. LIST OF REFERENCES. 
Agrell, S. O., 193It: ‘‘The Adinoles of Dinas Head, Cornwall,” Min. Mag. XXV., 
pp. 305-337, 1939. y . 
Campbell, W. D., 1910: “Report on an excursion to Armadale,” Jour. Nat. Hist. 
oncH of Jfest. Austr.^ Vlcxl. III., No. 1, pp. 28-29. 
Clarke, E. de C. — 
1926: “The Geology and Physiography of the Neighbourhood of Perth, 
Western Australia.” A.A.A.Sc. Handbook for Pertli Meeting, 
1926, pp. 23-30. 
1930: “The Pre-Cambrian Succession in some parts of Western Australia ” 
Kept. A.N.Z.A.A.Sc. for 1930, pp. 155-192. 
and Williams, F. A., 1926: “The Geology and Physiograjihy of jmrts of the 
Darling Range, near Perth,” Jour. Hoy. Soe. W.A., XII., pp. 161-178. 
Ellis H, A., 1939: “The Geology of the Yilgarn Goldfield, South of the Great 
Eastern Railway,” Geol. Surv. W.A. Bull 97. 
Essoj^ A. G. D., 1927: “The silver-lead deposits at Muudijong,” Oeol. Stirv. 
W.A. Ann. Bept. for 1926, pp. 4-9. 
Forinan, E G., 1937: “A Contribution to our Knowdedge of the Pre-Cambrian 
Simcession in Some Parts of Western Australia,” Jour. Hoy. Soc. W.A., 
XXIII., pp. xvii-xxvii. 
Goldschmidt, V. M., and Peters, CL, 1932: “Znr Cheiir'e dos Hors IT,” 
Nachnohten von der Gesellschaft der Wissen, Mat. Phv.<!. Klas.^te iii. No. 28 
iv., No. 31, pj). 528-545. ' ’ ’ ’ 
