377 



as Agnostus elkedraensis and Microdiscus significans A 2 ® The 

 precise locality is the deserted cattle station of Elkedra, in 

 Lat. 21° S., Long. 135'22° E. 



1903. — Prof. J. W. Gregory, in a paper entitled "The 

 Heathcotian : a Preordovician Series and its Distribution. "(21) 

 described a further Trilobite from the Mount Ida beds as 

 Notasaphus fergusoni. He expressed the opinion that my 

 Dinesus ida comprised two forms, one of which he names as 

 above, and further, that the deposit was not of Cambrian, but 

 of Ordovician age. 



The first record of organic remains in the Heathcote 

 rocks was, I believe, by Prof. Sir F. McCoy, who recorded 

 "cylindrical, flexuous markings, from one to two or scarcely 

 three inches in length . . . usually attributed to annelid 

 burrows, and are common in Cambrian rocks. . . . There 

 is no reason for supposing from these specimens that the rock 

 is older than Cambrian or Lower Silurian." (22 ^ 



Mr. E. Lidgey, in a report ( 2 $ on the general geology of 

 the Heathcote Parish and others contiguous, refers to "mica- 

 ceous mudstones containing casts of Trilobites," members of 

 these Lower Silurian rocks occupying rather less than one- 

 fourth of the area reported on. 



An important survey was made by Mr. W. H. Ferguson 

 "for the purpose of denning the boundaries of an outcrop of 

 Cambrian strata known to occur in the parish of Knowsley 

 East. The Trilobite beds outcrop along the valley of Lady 

 Creek and consist of "micaceous mudstones very rich in fos- 

 sils." From Mr. Ferguson's remarks it is clear that the 

 geology of this district is complicated and obscure. < 24 ) By the 

 late Mr. T. S. Hall these bed rocks were regarded as of Lower 

 Silurian age, "but low down in the series near the Cambrian 

 horizon." 



1904. — A further discovery of trilobite remains had 

 been made about this time by Mr. Thomas Stephens < 25 ) at the 

 Florentine Valley, Humboldt Divide, West Tasmania. The 

 fossils, casts of small Brachiopods, as well as those previously 



(20) Etheridge : "Off. Contributions," etc., Nos. 12 and 13, 

 1902, p. 3, pi. ii. 



(21) Gregory: Proc. Rov. Soc. Vict., xv., (n.s,), pt. ii., 1903, 

 p. 152. 



(22) McCoy: Vict. Ann. Rep. Secy. Mines, 1891 (1892), p. 30. 



(23) Lidgey: Geo. Survey Vict., Progress Report, viii., 1894, 

 pp. 44 and 45. 



(24) Ferguson : Geol. Survey Vict, (n.s.), No. 2, Monthly 

 Progress Report, May, 1899, pp. 23-25. 



(25) Etheridge : Rec. Austr. Mus., v., pt. 2, 1904, p. 98, pi. x. 



