BY LOFTUS HILLS, M.B.E., M.SC. 145 



the Permo-Carboniferous and Trias-Jura is an unconformity 

 or a disconformity, or whether there is a conformable suc- 

 cession. 



(i). The study of the stratigraphy and the abundant 

 flora of our lacustrine Tertiary beds is a desirable and at- 

 tractive undertaking, and it is surprising that this has not 

 been attempted in view of the very strong development of 

 these beds at our second largest centre of population. 



(j). The detailed mapping of the glaciated areas of Tas- 

 mania is a task yet before us, although some progress has 

 been made. The location of the ice-sheets and the glaciers 

 descending therefrom has only been partially effected, but 

 the final solution of this problem necessitates work in some 

 of the wildest and most inhospitable parts of the Island. 



(k). The details of the separation of Tasmania from 

 the Mainland have yet to be determined. 



(1). The mapping of the Port Cygnet alkaline series 

 has not yet been accomplished, and the order of succession 

 within this petrogenic cycle yet remains to be determined. 



(m). The study of the field occurrence of the diabase 

 so long neglected has only recently been undertaken, but as 

 this rock covers such a large proportion of Tasmania the 

 amount of work to be accomplished on this problem is very 

 considerable. 



(n). The investigation of the structural relationships 

 of our Epi-Silurian plutonics is an important one, and still 

 remains to be satisfactorily dealt with. 



(o). The determination of the exact relationship be- 

 tween our trachydolerites, limburgites, and normal olivine 

 basalts. 



(4.) Economic Geology. 



(a). The detailed description of some of our most im- 

 portant ore deposits yet remains to be accomplished. This 

 applies particularly to the copper deposits of Mt. Lyell, the 

 tin deposits of Mt. Bischoff, and the galena lodes of the Mag- 

 net district. 



(b). The mapping and description of the ore deposits 

 of various types in many districts not yet examined in de- 

 tail represent work for some years to come. 



(c) The genetic classification of those of our ore de- 

 posits which have been examined to any appreciable extent 



