GEOLOGY OF YASS DISTRICT. 117 



nema, Orthoccras, Encriniiriis punctatns, Phacops, Odontopleura 

 Bowningensis, Ceratocephala Vogdesi. 



Immediateh' above the limestone is a thin bed of shale con- 

 taining chiefly : — Cyathophyllum shearsbii, Heliophyllum yassense, 

 Eth. fil. ; H., sp. ; Carpospongia (very numerous) ; Aulopora, 

 Phjllipsastnea, and a few trilobites. 



The shale bed overlying contains a large number of trilobites, 

 including the following : — DalmanUes meridianiis, E.and M. ; Phacops 

 sp. ; Proetiis, Odontopleura, Ceratocephala longispina, Mitchell .s^. 



Corals are very rare, besides being small and badly preserved. 

 The commonest is either a Zaphrentis or a PalcBOcyathus. A few 

 Lingida and Orthis are present, also a fair number of a small 

 Chonetes. At Rainbow Hill, about half a mile S.W. from Hatton's 

 corner the shale at the top of the scrap is remarkable for the 

 enormous number of remains of Dabnanites meridianus. They are 

 chiefly of a fragmentary nature, but many good complete examples 

 will also be obtained at this locality. The compound eyes are 

 beautifully preserved, showing all the details of the facets. 



These shales form the Phacops Bed of Jenkins, and are followed 

 by a thick bed of barren shales, very much folded and faulted, which 

 are in turn overlaid b}/ Mitchell's Upper Trilobite Bed. This bed 

 contains numerous trilobites, including : — DalmanUes meridianus, 

 E. & M. ; Phacops crosslei, E. & M. ; P. serratus, Foerste ; Odonto- 

 pleura Boivningensis, E. & M. ; 0. Jenkinsi, E. & M. ; Ceratocephala 

 longispina, Mitchell sp. 



In the impure limestone bed, which outcrops neai" the junction 

 of Euralie Creek with the Yass River, the following fossils are 

 obtained : — Cyathophyllum shearsbii, Eth. M.S. ; Cyathophyllum ; 

 Spongophyllum (?) giganteum, Eth. fil. ; Ccenites expansus, de Kon ; 

 Alveolites ; Syringopora ; Try plasma lonsdalei, Eth. fil. ; T. lonsdalei, 

 vars minor and Scalariformis, Eth. fils.; T. dendroidea, Eth. fils. ; 

 DiphyphyUum sp. ; Cystiphyllum, Favosites, Trachypora. Heliolites, 

 Stromatopora, Crinoid remains; Spirifera cff. fimhriata, Conrad; 5., 

 sp. ; Clorinda, Loxonema, Orthoceras, Euomphalus, Bellerophon, 

 Encrinuriis, and sponge remains, probably Carpospongia. 



Near Bowning, where the uppermost of these beds are best 

 studied, numerous layers of conglomerate are to be found inter- 

 spersed with the shales, ranging from a few inches in thickness at 

 the beginning, and increasing to many feet in thickness towards the 

 close of the series, culminating in a very thick bed, known as the 

 Bowning conglomerate, which forms the base of Bowning Hill 

 (2,605 feet). On the Black Range road, about seven miles from 

 Yass, on por. 130, Parish of Yass, the lowest bed of this conglomerate 

 consists of porphyrite and quartzite boulders, mixed with fossiliferous 

 limestone pebbles, containing Favosites, Syringopora, Trachypora, 

 and some brachiopods. These limestone nodules disappear higher 

 up, where the chief constituents of the conglomerate are porphyry 

 pebbles. In portion 2. Parish of Yass, this conglomerate merges 

 into soHd quartz porphyry, with light-coloured felspars and quartz, 

 in a bluish base. Transition ]ihases between the conglomerate and 



