32^ REPORT? OF RESEARCH COMMITTEES. 



12. L. Keith Ward. — Contour map of South Australia. 



Annual Report of the Government Geologist for 1916. 



13. R. Lockhart Jack. — ' The geology of the Moonta and 



Wallaroo Mining District.'' Bull. Geol. Surv. S.A., 

 No. 6, 1917. 



14. L. Keith Ward. — " The quality and source of the water 



in Lakes Leake and Edward." Annual Report of the 

 Government Geologist for 1917. 



15. W. HowcHiN. — " Notes on the geology of Ardrossan and 



neighbourhood." Proc. Rov. Soc. S.A., Vol. XLII., 

 1918. 



16. B. Lockhart Jack. — " The Phosphate Deposits of South 



Australia. Bull. Geol. Surv. S.A., No. 7, 1919. 



17. W. R. Browne. — "The Igneous Rocks of Encounter 



Bay." Proc. Roy. Soc. S.A., Vol. XLIV., 1920. 



18. W. Howchin. — " Past glacial action in Australia." 



CommonwcaUh Yenr-Boolc, No. 13, 1920. 



Mention should be made also of the contour-map, 1 mile to' 

 1 inch, of Adelaide and surroundings, prepared by the Common- 

 wealth Military Survey, and published in 1914. 



There is a number of references to the physiography of South 

 Australia by Professor Griffith Taylor in his papers listed else- 

 where in the report of this Committee. 



The study of the relief of South Australia in the above-mentioned 

 maps and papers, indicated by the reference numbers given above, 

 will result in the recognition of the following salient features : — 



The north-western part of the State is occupied by the eastern 

 part of the great pre-Cambrian block which constitutes so large a 

 portion of Western Australia (6). The Musgrave Ranges rising 

 to over 5,000 feet have an east-west trend, as do the Everard 

 Ranges. The topography of this region is influenced by faulting, 

 and during recent geological time by arid climatid conditions.' 

 The waste sheet of sand extends from the Ranges southwards till 

 the Miocene limestone of the Eucla Basin is reached, close to the 

 East-West railway (4, 12), and at about the 500-ft. contoun-line. 

 This complex block extends eastwards to the Lake Toriens- 

 Spencer's Gulf rift, and on the worn-down surface of pre-Cambrian 

 rocks rest more or less horizontal residual fragments of Ordovician 

 and Upper Cretaceous sediments and the felspar-porphyry 

 forming the dissected plateau of the Gawler Range (3, 6). The 

 inequalities in the surface of the lock floor on Eyre Peninsula 

 have been modified by the deposition of terrestrial deposits (5). 

 But the more resistant portions of the block stand out in bold relief 



