376 



1892. — Prof. Tate described (") both Molluscan and Trilo- 

 bate remains from another locality on Yorke Peninsula, Curra- 

 mulka. The latter were called Microdiscus subsagittatus and 

 Olenellus pritchardi. Both at this locality and at the typical 

 one, Ardrossan, Tate regarded the beds as Lower Cambrian or 

 "Olenellus Zone," formerly termed by him Lower Silurian. 



1895. — On the downs, five miles to the northward of 

 Alexandria Cattle Station, Playford Creek, Northern Terri- 

 tory, in sinking a well, soft argillaceous rocks were met with to 

 a depth of 200 feet. In the spoil from this well Mr. H. Y. 

 L. Brown, the Government Geologist, found a Trilobite 

 cephalon.( 14 ) This I described as Olenellus browniS 15) The 

 discovery and determination of this fossil, found in 1894, was 

 the first definite record of the occurrence of Cambian rocks in 

 the Northern Territory. ( 16 ) Mr. Brown cites a number of 

 localities at which the lithological characters of this limestone 

 formation are similar, and concludes by saying: — "The occur- 

 rence of Cambrian fossils near the Daly River and Alexandria 

 Station proves that these widely-separated expanses of lime- 

 stone are identical in age." ( 17) He had, however, previously 

 stated his conviction that the limestone seen "at the Daly 

 Telegraph Station, the Katherine River, and down the Vic- 

 toria River was a continuation of that struck at the Alexandria 

 Cattle Station bore." (18 ) In this limestone at the Katherine 

 River, Dr. H. J. Jensen stated Mr. Brown found both 

 Salterella hard man i and Olenellus forresti, but I am not 

 acquainted with Brown's reference. 



1896. — In 1896 appeared a paper by myself in which I 

 suggested the presence of Cambrian rocks at Mount Ida, near 

 Heathcote, in Victoria, basing my opinion on the presence of 

 some fragmentary but very interesting remains, to which I 

 gave the name of Dinesus idaS 19 ^ 



1902. — Two additional Trilobites from a further Cam- 

 brian locality, about 150 miles south-west of Alexandria Old 

 Cattle Station, were obtained by Mr. Brown, and described 



(13) Tate: Trans. R. Soc. S. Austr., xv., pt. ii., 1892, p. 183, 

 pi. ii., figs. 9, 11-13. 



(14) Brown: "Report N. Territory Explorations," S. Austr. 

 Pari. Papers, No. 82, 1895, p. 24, chart 8. 



(15) Etheridge: "Off. Contrib. Pal. S. Austr.," No. 9, S. 

 Austr. Pari. Papers, No. 127, 1897, p. 13, pi. i., fig. 1. 



(16) Brown : "Northern Territory, etc., Reports Geological and 

 General, 1905," S. Austr. Pari. Papers, No. 55, 1906, p. 14. 



(17) Northern Territory, Ibid, p. id., p. 14. 



(18) Brown: "Report N. Territory Explorations," S. Austr. 

 Pari. Papers, No. 82, 1895, p. 26. 



(19) Etheridge : Proc. Roy. Soc. Vict., viii. (n.s.), 1896, p. 56. 



