54 Proceedings of the Royal Society of Victoria. 



on anything more than mere stratigraphical evidence. Mr. 

 Lidgey speaking of the metaniorphic rocks of the area in 

 question says :* " These rocks have already been reported on 

 by Mr. E. J. Dunn, who classes them as Pre-Silurian," but I 

 regret that I cannot at this moment call to mind the report of 

 the latter gentleman. The Pre-Silurian rocks in question, Mr. 

 Lidgey further adds, are succeeded by others of Lower Silurian 

 age, occupying " rather less than one-fourth of the area mapped 

 in this quarter-sheet, lying to the west of the Mount Ida Range, 

 overlying the metamorphic rocks, and being covered on the west 

 by glacial conglomerate (Mesozoic)." These' micaceous mudstones 

 ai'e further stated to contain " casts of Trilobites." Whether the 

 specimens about to be desci'ibed are from the metamorphic area, 

 or from the supposed Lower Silurian mudstones, I am unable to 

 say, but I presume from the latter. 



Again, Mr. W. H. Ferguson, reporting on the rocks at Dookie, 

 says :t " The rocks which outcrop at Dookie township appear to 

 belong to the same formation as a series of very ancient rocks 

 which occur in the Heathcote district. They are quite distinct 

 from the Silurian formation of the gold-fields, or from the granite 

 and metamorphic rocks of the north-eastern district, or those of 

 the county of Dundas." Lastly, Mr. James Stirling, in " Notes 

 on the Silver Deposits and Limestone Beds of \N'aratah Bay,"J 

 remarks that " the sedimentary deposits at Point Grinder, between 

 Cape Liptrap and Waratah Bay, rest unconformably under \sic'\ 

 hard felsitic rocks. . . . These may be either Silurian or Pre- 

 Silurian." In sketch section No. 1, on the opposite page of this 

 Report, these beds are indicated as Cambrian, pure and simple. 

 On the next plate but one — a sketch of Waratah Bay — the same 

 are presumedly given as Pre-Silurian, but again on the succeeding 

 plate to this Mr. Stirling reverts to the use of the word 

 Cambrian. 



In January of last year (1894), Mr. Ferguson was good 

 enough to forward to me a few Trilobite remains from near 

 HeathcotCj for an opinion as to their identity. In a letter, 

 dated 19th January, he says: — "We think the rock is Lower 



* Geol. Survey Victoria, Progress Report, viii., 1894, p. 44. 

 t Progress Re]X)rt viii., he, p. 44. 

 : Ihid, p. 68. 



