four feet, while another, of Devonian quartzite, is exposed 

 for a length of over four feet six inches. The zone of Iaige 

 erratics has a thickness of approximately 100 feet. The 

 mudstone containing the erratics is simply crowded with 

 Strophalosia and other fossils (see below). It is at the 

 base of this zone that large and beautifully preserved 

 specimens of Eurydesma occur. As determined by Mr. 

 Dun, the species is E. hobartense and not E. cordatum, 

 which is the one so characteristic of the Lower Marine Beds. 



Below the Eurydesma zone exposures are not very good, 

 and time did not permit of a detailed examination being 

 made. The rocks are sandy mudstones with little groups 

 of small erratics, very strongly recalling the beds associated 

 with "glendonite" at Jervis Bay. 1 The dip gradually 

 swings round until, just above the road-bridge over Wattle 

 Ponds Creek, it is N. 50° E. at 10\ The creek was not 

 followed below the bridge, but at "The Retreat," half a 

 mile distant down, stream the dip is N. 20° B. at 3°. I 

 estimate that the beds between the Eurydesma zone and 

 the road are about 450 feet in thickness, and hence to 

 "The Retreat" about another 185 feet. The rock at "The 

 Retreat" is a massive sandstone with very few erratics. 

 Below the Eurydesma zone the section is singularly barren 

 in fossils. 



Along the road towards Singleton, close to the point 

 where it crosses the southern branch of Wattle Ponds Creek, 

 is a thin band of flaggy argillaceous limestone of light 

 buff colour, containing small "glendonites" of the compo- 

 site type characteristic of the upper horizon of Jervis Bay. 

 From the arrangement of the beds this horizon appears to 

 lie slightly below the sandstone of "The Retreat": but in 

 absence of definite measurements it is impossible to estimate 



1 Records Geol. Surv. N,S. Wales, 1905, Vol. via, p. ii, p, 168. 



