378 



mentioned, are preserved in a yellow, slightly micaceous, 

 somewhat fissile mudstone. A well-marked pygidium I termed 

 Dikelocephalus florentinensis, and two others were referred 

 with some doubt to the genus Niobe. 



The Florentine River is a tributary of the River Derwent. 

 Mr. L. K. Ward speaks of these fossiliferous beds as the 

 equivalents of the Caroline Creek deposit. 



1905. — Not far from Wirrialpa, in the Flinders Range, 

 Mr. Howchin discovered a shelly band in a flesh-coloured 

 oolitic limestone, containing Brachiopoda and remains of 

 Trilobites. One of these latter was described as a species of 

 OlenellusS 26 ) This locality is in the vicinity of the Blinman 

 Mines, about midway between Lake Torrens and the south 

 end of Lake Frome. 



1907. — To all interested in the Cambrian geology of 

 South Australia, and possibly that of Australia generally, 

 Mr. W. Howchin 's paper, "A General Description of the 

 Cambrian Strata of South Australia, "( 27 ) will be invaluable. 

 He divided the beds into Upper ("Purple-slate") Series and 

 Lower Cambrian Series. With the exception of the Brighton 

 radiolarian beds, the fossiliferous horizons are limited to two 

 limestones high up in the upper division, as at Parara, Curra- 

 mulka, Sellick Hill, Blinman, and Wirrialpa, etc. Howchin 

 estimates the Archaeocyathinae Limestone, in which the South 

 Australian Trilobites occur, together with Brachiopods, Ptero- 

 pods, and a Calcareous Alga, to have formed "coral" reefs in 

 the Cambrian sea from one hundred to two hundred feet 

 in thickness. 



1908. — A preliminary paper( 28 ) by Mr. F. Chapman 

 revealed the presence of trilobite remains at the Dolodrook 

 River, Mount Wellington District, Gippsland, in a hard and 

 sub-crystalline limestone. Three forms were recognizable — 

 an Agnostus, a Proetus, and a Cheirurus. The age of thi6 

 limestone was at this period left an open question. 



1911. — In a further paper during 1911 Mr. Chapman 

 elucidated these fragmentary remains, ( 29) and considered 

 the limestone to be of Upper Cambrian age. The 

 occurrence of Agnostus is confirmed; the Proetus represented 

 two species of Ptychojxtria, whilst the Cheirvrus proved to be 

 a Crepicephalns. 



(26) Etheridge : Trans. Roy. Soc. S. Austr., xxix., 1905, p. 247. 



(27) Howchin : Rep. Austr. Assoc. Ad. Sci., xi., 1907 (1908), 

 p. 414. 



(28) Chapman : Proc. Rov. Soc. Vict., xxi. (n.s.), pt. i., 

 1908, p. 268. 



(29) Chapman : Proc. Rov. Soc. Vict., xxiii. (n.s.), pt. ii., 

 1911, p. 305. 



