146 THE PROGRESS OF GEOLOGICAL RESEARCH IN TASMANIA. 



is very desirable. This must entail the recognition of the 

 metallogenic epochs, and in addition the greater refinement 

 of the various phases within each epoch. This is the prob- 

 lem on which the writer has been engaged in preparing his 

 thesis on the "Metallogenic Epochs of Tasmania." 



(d) Much work remains to be done on the determination 

 of the extent and value of our coalfields. 



(e). No work of importance has been attempted in re- 

 gard to our building stones. This is a subject for valuable 

 study. 



(f ) . The investigation of our deposits of the raw ma- 

 terials in the ceramic and glass-making industries is badly 

 needed. 



(g). An important mineralographic study awaiting 

 attention is that of the stanniferous pyrrhotite ore-bodies 

 of North Dundas. The determination of the mode of occur- 

 rence of the tin and its exact relationship to the pyrrhotite 

 is an important preliminary in any metallurgical research 

 on these ores. 



(h). The whole problem of the genesis of our ore de- 

 posits and the factors controlling their deposition fairly 

 bristles with intricate problems which are too numerous to 

 attempt to indicate in this paper. Suffice it here to say that 

 the progress already made is only a very small portion of 

 the work necessary before anything approaching a com- 

 plete elucidation of the factors controlling the distribution, 

 extent, and value of our valuable mineral deposits can be 

 attained. 



(5.) Correlation. 



With the exception of that accomplished in regard to the 

 Permo-Carboniferous and Trias-Jura systems, practically 

 no work has been done on correlating our Tasmanian systems 

 and rock species with those of the mainland. This is import- 

 ant work which will only become possible of complete accom- 

 plishment as our investigations extend in Tasmania. Much, 

 however- can be done at present, and it is very desirable 

 that the first opportunity should be seized of summarising 

 the conclusions which are possible on present evidence. 



