178 president's address — section c. 



and Salterella, and described the beds in consequence as Lower Cam- 

 brian. Mr. Summers and myself on a recent visit to the locality 

 examined the occurrence in some detail, and we hope to publish an 

 account of our observations shortly. Among the fossils we found in 

 black shales interbedded with the cherts and phosphate bands were a 

 number of well-preserved graptolites, including Diplograptus, Coeno- 

 graptus, Glossograptus, Tetragraptus, and Didymograptus, allied to 

 D. caduceus. This association of forms suggests that they belong either 

 to the Darriwill series at the top of the Lower Ordovician, or to the 

 base of the Upper Ordovician series. As some of these grapto- 

 lites were taken only a few yards away from the locality where the 

 trilobites were found it would appear that a rer-examination of the 

 trilobite material is advisable since the evidence of the graptolites 

 points unmistakably to the beds belonging to the Ordovician. 



Egerton. — Grey and reddish cherty rocks with small ramifying 

 quartz veins occur on a hill near Egerton, and are surrounded by 

 Ordovician rocks. Mr. Dunn (31) on lithological grounds has referred 

 them to the Heathcotian, but in the absence of stratigraphical and 

 palasontological evidence it would seem to be safer to regard them as 

 modifications by silicification of the Ordovician series. 



Eastern Gippsland. — Near the Iron Mask Mine, and on the 

 Mount Tara Goldfield, near Buchan, are rocks whose relations to the 

 Ordovician have not been determined, but which Dunn (28) on litho- 

 logical grounds has classed with the Heathcotian. In a few localities 

 diabasic and serpentine rocks unaccompanied by cherts have been 

 referred to the Heathcotian series. 



West of Geelong .■ — Two outcrops of diabases and amphibolites 

 occur to the west of Geelong which Gregory (24) has correlated with 

 the Heathcotian series. The stratigraphical relations of these rocks 

 to the Ordovician series in the district is obscure. 



Limestone Creek, Benam^yra. — Siliceous schists 2^ miles from the 

 hut on Limestone Creek and at Serpentine ^ mile east of gap between 

 Limestone Creek and Mount Leinster Station are by Dunn (30) doubt- 

 fully referred to the Heathcotian. 



Mount Wellington District, North Gippsland. — The Serpentine 

 of this district has been shown by Thiele (34) to be older than the U. 

 Ordovician which rests on its flanks, and it is possible that it may 

 belong to the same period as the basic rocks of Heathcote. It is 

 probably in the main an intrusive mass. 



Some areas remain to be noticed in which both cherts and 

 diabases are associated, and in which therefore a correlation with the 

 type area can be attempted with rather more confidence. 



Nowa Nowa. — Just North of Nowa Nowa, at the head of L. 

 Tyers, in Gippsland, is an outcrop, so Mr. Dunn informs me, of 

 diabases associated with cherts. I have not visited the precise 

 locality, but Mr. Dunn tells me the relations of the rocks are similar 

 to those of Heathcote, and he refers them to the same age. 



Tatong. — The cherts and associated diabases at Tatong, near 

 Benalla, in N.E. Victoria, first referred to by Howitt (25) on litho- 

 logical grounds as probably Heathcotian (Pi-e-Ortilovici^' '* have been 



