64 11^ J. Harris : 



Hall, but T. ensiformis, J. Hall. I doubt if I have ever found 

 T. Wilkinson i. A specimen of PJiyUoyraptus was found in a frag- 

 ment of rock, but not in situ. West of this locality similar beds 

 are found, but not being well exposed, their graptolites cannot be 

 given in detail, though Oncograjitus, D. cadaceus, Dijdograptus 

 gnomonicus, sp. nov., Didymograpttis v-deflexus, sp. nov., and 

 one specimen of Glossograjytiis may be recorded. 



To the south is the Military Rifle Range. On it uppermost 

 Castlemaine beds may be seen with characteristic forms, including 

 D. caduceus and Loganograpt'KS logani. In the.se beds an occasional 

 Oncograptus may be found, but it is extremely rare. About 400' 

 yards to the west of the Range there is a cutting on the Maldon 

 line exposing thick beds of blue slate badly cleaved. D. caduceus 

 and Oncogra2itus iijjsilon were obtained here, and a few yards 

 to the south, on a small race, D. caduceus, D. forci2:)iformis, and 

 Goniograptus speciosus, T. S. Hall. Still going west and a little 

 south, the next l>eds, 300 yards further, on McKenzie Hill, yield a 

 collection of forms difficult to specify; the beds are typically Upper 

 Castlemaine. A rare Trigondgraptvs or Oncograptus may be found, 

 but by far the most common form is B. caduceu's, and its varieties. 

 This is the bed taken as typical of the Logano-caduceus (upper- 

 most Castlem.aine) zone, but though Loganograptus logani is com- 

 mon here, it is rare at other outcrops in the district. 



The only other places where Oncograptus has been found in close 

 relation to a recognised zone are near Yapeen and south of Guild- 

 ford, and at both these places the nearest beds are Upper Castle- 

 maine. West of these outcrops other forms are found and will be 

 described, but Lower and Middle Castlemaine forms are conspicu- 

 ously absent. 



The field relations of the Darriwil beds near Yapeen and at 

 Guildford and Woodbrook seem to indicate a high horizon for 

 them. Along the line of strike in every case where fossils have been 

 found they have been Upper Castlemaine. Occasional Oncograptus 

 forms are found in Upper Castlemaine beds, and, as will be shown, 

 there is a gradual progression from Upper Castlemaine through the 

 Oncograptus beds to the original Darriwil zone. 



(b) Nature of Fades. 



A consideration of the Oncograptus facies involves the question 

 of the subdivision of the beds of the series. The Bendigo and 

 Castlemaine succession has long been known, but, while the grap- 

 tolites of these two series are widely distributed, our knowledge of 



