10 R. Henry Walcott: Volcanic Tuff. 



occurrence of the latter to re-deposition. If Lake Terang does not 

 represent an ancient centre of volcanic activity, it is inconceivable- 

 how a mass of volcanic ashes and coarser ejectamenta, covered with 

 lava for the greater part, and undoubtedly in situ, came to be 

 piled up there where there is no evidence whatever to connect its. 

 presence with any other possible source of origin. 



It is possible, however, that the crater basin ocupied by the 

 lake may have been enlarged by subsidence through the withdrawal 

 of material from below. 



In view of the facts given it may fairly safely be taken that any 

 works of man discovered beneath the tuffsi of the areas under con- 

 sideration would at least put his history back to the last great 

 epoch of volcanic activity in south-west Victoria, and make himt 

 the contemporary of our giant extinct marsupial fauna. 



