280 FOSSILIFEROUS TUFF, ETC., AT CAVAN, 



phylhitn, Chcetetes (?), Alveolites, Desmidopora, Syringoj^ora, 

 Leptctna, Spirifira yassensis, De Kon,, and some undeterminable 

 univalves. In the shale overlying the porphyry at the foot of 

 the hill I afterwards unearthed Cyatliophyllum, Favosites, and 

 Syringopora. All of these belong to the Middle Devonian. 



From the top of Clear Hill is obtained a splendid view of the 

 Murrumbidgee River as it winds its way in and out among the 

 hills, and the strike of the limestone ridges can be followed by 

 the eye over hill and dale, as it runs in a north-westerl}' direc- 

 tion, and recalls to one's mind the furrows of a newly ploughed 

 field on a highly magnified scale. To the south-west the country 

 is rugged and broken, and the boundary of the furrows cannot 

 be traced by the eye far from the hill, but a clear line of igneous 

 rocks bounds them on the north-east just as a wall or fence 

 marks the boundary of an ordinary paddock. In the creeks 

 about here I found man}^ blocks of rock which had broken away 

 from the main mass of the volcanic sheet, which showed a distinct 

 brecciated structure consisting of fragments of rhyolite in a 

 felsitic base. 



On leaving Clear Hill and examining the limestone ridges to 

 the west and north-west, I found many interesting fossils of the 

 Middle Devonian period. It is a wonderful collecting ground, 

 and awaits a more searching scrutiny than I have been able to 

 give it. Amongst others, the following were obtained .• — Astylo- 

 spongia, Receptaculites austrcdis, Salter, Stromatopora, Syringo- 

 pora, Microplasma, Cyatho2)hylluin, Diphyphylluin, Spongo- 

 phyllum, LitophyUum, dendroid Favosites and Alveolites, Lep)tcena, 

 Atrypa reticularis, Linn., Chonetes culleni, Dun, Loxonema, 

 Actinoceras, and what look like weathered sections of Nautilus. 



Many of the corals from this locality are of extra interest on 

 account of their partial transition into Beekite (SiOo), one 

 specimen of Litophyllum especially looking very attractive, the 

 surface being covered with rosettes of this mineral. The Stroma- 

 toporoids to be found in this locality are also very beautiful, the 

 weathering they have been subjected to showing up the structural 

 detail of the canals to advantasre. 



