Sedimentary Rocks. 55 



Trigonograptus ensiformis, J. Hall. 

 Cryptograptus tricomis, Carruthers. 

 Phyllograptus, sp. 

 cf. Thamnograptus. 

 cf. Cardiograptus. 



This assemblage of graptolites presents several interesting fea- 

 tures. The association of Diplograptus with Phyllograptus is 

 found elsewhere, as for example at Ba 29, Sect. 20, Newham r 

 from which locality came some of the first Australian graptolites 

 to be described. 28 The Newham or' Cobaw outcrop is remark- 

 able, an isolated patch of slate with well preserved graptolites in 

 a soil covered and unfossiliferous area. Dr. Hall 29 recorded 

 from it — 



Didymograptus caduceus, Salter. 



Diplograptus palmeus, Barrande. 



Glossograptus mucronatus, J. Hall. 



Tetragraptus quadribrachiatus, J. Hall. 



Phyllograptus typus, J. Hall. 



Goniograptus, sp. 



Lasiograptus, sp., 



and believing from his Castlemaine observations, that Phyllo- 

 graptus disappeared below the Upper Castlemaine horizon, 30 con- 

 cluded that both the Darriwil and Castlemaine series were re- 

 presented. His belief that Phyllograptus was not found with 

 Loganograptus was also probably responsible for the identifica- 

 tion of Goniograptus instead of Loganograptus} There is no 

 doubt whatever that the collection is quite homogeneous. Phyllo- 

 graptus, Diplograptus and Lasiograptus may be obtained on the 

 same slab, and all the fossils are from one isolated band. One 

 of us 31 has shown in an earlier paper that Phyllograptus reap- 

 pears in the Middle Darriwil, and it now seems probable that it 

 may persist at some localities into the Utoper Darriwil series. 

 The finding of Cryptograptus tricomis and the common occur- 

 rence of Diplograptus at the Gisborne outcrop, would place- it 

 very high in the Lower Ordovician, and it may be the highest 

 bed yet recognised. Cryptograptus tricomis is elsewhere in Vic- 

 toria an Upper Ordovician form, but it occurs in Lower Ordo- 

 vician shales near Woodend, and at the " Cheniston " locality. 



28. 1 and 15. 



29. 16, p. 126. 



30. 7, p. 73 and 10, pp. 441, 443. 



31. 18, p. 67. 



