80 Proceedings of the Royal Society of Victoria. 



It would also be evident that the period of activity of 

 Webb's Hill is much older than that of the Buninyong lava 

 stream here dealt with. The erosion previous to that flow of 

 lava was probably considerable, and now the materials on the 

 surface would appear for the most part to represent the older 

 ejectamenta of that hill. From the period of activity and 

 similarity of lava it may be that Webb's Hill and the vents 

 now buried are contemporaneous, and perhaps connected with 

 the Durham Lead lava, for which Messrs. Murray and Etheridge 

 suggest a source near Buninyong. 



We have, then, that there is represented in the locality an 

 earlier period of volcanic activity to which we may refer 

 Webb's Hill, the ejectamenta in the mines, and the Durham 

 Lead and Yarrowee flows. The black clay beds accumulated 

 subsequently to these in a swamp or lake until covered by 

 lava streams from Buninyong. There need not have been any 

 considerable lapse of time since this, so that the bones are 

 referable to a comparatively recent period. 



In conclusion, I must express my thanks to the Hon. R. T. 

 Vale and Mr. N. Kent, the mine manager, for the assistance 

 and facilities given in examining the mine and collecting 

 fossils, and also for plans of the workings ; to Mr. De Vis, for 

 the valuable discussion of the authenticity and identification 

 of the bones ; and to Mr. R. J. Allen, engineering assistant at 

 the Ballarat School of Mines, who undertook certain surveys 

 and levels ; and to those who have at various times assisted 

 me in the collection of fossils, and in other ways. 



