306 Freili'i-ick (Jhapnian : 



Great Britain one of its nieniibers, 0. (Plectorthis) hicksii, David- 

 son, is a characteris'tic fossil of the Middle Cambrian (Meneviaa 

 Beds). In China the same type of shell is seen in 0. linarssoni, 

 Kayser, from the rocks of Ta-ling. This species of brachiopod 

 is found, according to C. D. Walcott, in both the Middle and 

 Upper Cambrian faunas of China.l 



The brachiopod limestone was found at a spot close to Roan 

 Horse Gully, a tributary of the Dolodrook River, whilst the 

 trilobite limestone occurred on the Dolodrook River at the wes- 

 tern end of the belt. 2 Regarding the stratigraphy of the ex- 

 posures of limestone, Mr. Thiele has remarked as follows^ : — 

 " These rocks occur a,s a number of small lenticular outcrops 

 along a line conforming in general to the strike of the [Upper] 

 Ordovician rocks, and a short distance away from the serpentine 

 belt, on its south-western side." The bed of limestone at Roan 

 Horse Gully is referred to by Mr. E. J. Dunn^ as follows: — " It 

 appears to be resting on the serpentine. It may belong to the 

 series of beds exposed at the junction of Thiele's Creek and Dolo- 

 drook Creek, where there is another outcrop. A third outcrop 

 occurs a few chains above the junction of Black Soil Gully w^ith 

 Dolodrook Creek, on the west side of the latter creek. These 

 limestone outcrops all appear to be of the same age, and the 

 last-mentioned is said to be traceable at intervals for a mile in 

 a south-west direction." Mr. Dunn further remarks : — " The 

 sedimentary beds now stand at an angle of 80 deg. to 85 deg." 



In view of the present discovery of undoubted Cambrian rocks 

 in Victoria, it will be interesting to examine at a later date 

 some further evidence, lately obtained, regarding the Heathcote 

 (Knowsley) trilobite fauna ; as well as that of certain fossils 

 obtained near Mansfield douljt fully referred to the Cambrian. 

 Respecting the Knowsley trilobites, Mr. R. Etheridge has already 

 given copious notes^ regarding the relationship of Diuesus to 



1 Proc. U.S. Nat. Mus., vol. xxix., 1906, pp. 4, 5. 



2 Consult map in O. E. Thiele's "Notes on the Dolodrook Serpentine Area and the Mt. 

 Wellinffton Rhyolites, North Gippsland." Proc. Roy. Soc. Viet, vol. xxi. (n.s.), pt. i., 1908, 

 pi. xi., facing p. 268. The trilobite occurrence is there marked L. 1, and tiie bracluopod lime- 

 stone L. 4. 



3 Loc. supracit., p. 263. See also Vict, Nat., vol. xxiv., 1907, p. 20, where .Mr. Thiele 

 states that the limestone is surrounded hy the graptolites slates. 



4 Rec. Geol. Surv., vol. iii., pt. 8, 1909, p. 68. 



5 Proc. Roy. Soc. Vict., vol. viii. (n.s.), 1896, p. 60. 



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