[Froc Roy. Soc. Victoria, 23 (N.S.), Pt. II., 1911.] 



Aki'. XXVI. — N<'U' or Li.ttl.e-Knoiun Victorian Fossils in 

 the National Miiseivm. 



Pakt XI r. — On a Trilobite Fauna of Upper Cambrian 

 Aoii (Olknus Skriks) in N. E. Gippsland, Victoria. 



By KREl:)EKrCK CHAPMAN, A.LS., &c. 



(Palaeontologist to the National Museum, Melbourne). 

 (With Plates LVIII.-LXI.) 

 [Read 13th October, 1910.J 



Introduction. 



A preliiuinarv note has already been writteni touching briefly 

 ujKin this interesting collection of fossils, which were obtained 

 by Mr. E. 0. Thiele, B.Sc, F.G.S.. from the Dolodrook River 

 in the Mt. Wellington District of N.E. Gippsland. In that note 

 the writer recorded the occurrence of Agnostus, together with 

 some, at that time, doubtful jJortions of opisthoparian trilobites, 

 of which only parts of the cephala and the pygidia were pre- 

 served. The latter specimens, it was then suggested, might pos- 

 sibly belong to (?) Clieirurus and (?) Proetus. An exhaustive 

 examination of these fragments, of which there are many, has 

 shown, however, that the two doubtful forms last mentioned 

 really belong to Crepicephalu-s and PtychoiJaria, both of which 

 are generic types of strong Cam,brian affinities. Further than 

 this, the prolific remains of Ac/nostiis, of the type of A. pisi- 

 formis, practically fix the age of the trilobite limestone as Upper 

 Cambrian. 



The pale grey crystalline limestone, found in apparently the 

 same l^elt as the dark grey trilobite rock, contains V)racluopods 

 and a (?) Girvaiiclla. The brachiopods are somewhat large for 

 Cambrian forms, and belong to the group Pl/^rfort/iis. This sub- 

 genus of OrfJi/s has not been found below the Lower Ordovician 

 in the North xVmerican region, where it is best known ; but in 



1 F. Chapman. Proc. Roy. Soc. Vic, vol. xvi. (n.s.), pt. i., 1!)0S, pp. -208, 269. 



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