170 P rucccdinysi of the Roijal Socie(i/ of Victorid. 



C. fiexilis is associated with forms most of which occur in our 

 T. fruticosus zone at Bendigo, while C. rigidus is accompanied 

 by Loganograptus logani whicli, in Victoria, does not appear till 

 after Phyllograptus typus has become extinct. 



There can be no doubt that the Lancefield beds are below the 

 beds which I have elsewhere called the Tetragraptus fruticosus 

 zone^ where all the genera, except Dictyonema and perhaps 

 Bryograptus occur. 



As regards Dictyonema it is not a little remarkable, consider- 

 ing its range both in Europe and America, that not a single 

 specimen has been recognised in Australia from anywhere except 

 Lancefield. 



The single specimen which I have doubtfully referred to 

 Phyllograptus is the only one I have seen from the locality 

 and is alone on a small slab. 



The question then arises how far below the Bendigo series 

 do the Lancetield beds lies ? Are we, on the evidence of the 

 presence of Bryograptus and of Clonograptus tenellus, to regard 

 them as Cambrian, or are we to regard these forms as here 

 ranging into the Ordovician ? Owing to the occurrence of 

 Bryograptus and Dictyonema sociale Lapworth has called the 

 Cape Rosier zone of Canada Cambrian,^ but Ells in the report 

 above quoted, hesitates to follow him till more stratigraphical 

 evidence is available. There is nothing apparently inheiently 

 improbable in the Cape Rosier zone being Cambrian, for the 

 so called Quebec group, to which it belongs, and in the district 

 where it occurs, comprises rocks varying in age from Pre- 

 Cambrian to Silurian. With us there is an indication at any 

 rate that the same state of things may possibly occur. Our 

 palaeozoic rocks are remarkable for the persistence of their 

 strike, which is not interrupted by the intervention of even large 

 areas of intrusive granite. Thus the Chewton-Castlemaine 

 Ordovician is interrupted to the north by the belt of Maldon- 

 Elpliinstone granite which is about ten miles wide, and yet to 

 the north of the area we again get Ordovician rocks of the same 

 age and the strike is unchanged, being still a few degrees west 



1 Proc. Koy. Soc. Vic, N.S. vii., ls<J4, p. 7C. 

 ••! Trans. Roy. Soc. Canada, 1S86, p. 



