363 



THE GEOLOGY AND PETROLOGY OF THE GREAT 

 SERPENTINE BELT OF NEW 80UTH WALES. 



Part vii. The Geolohv of the Loomberah District and a 



PORTION OF THE GOONOO GOONOO ESTATE. 



By W. N. Benson, B A., D.Sc, F.G.8., Professor of Geology 

 AND Mineralogy in the University of Otago, N.Z , late 



LiNNEAN MaCLEAY FeLLOW OF THE SOCIETY IN GeOLOGY. 



With two Pal^.ontological Appendices by F, Chapman, 

 F.R.M.S., A.L.S., Palaeontologist to the National 

 Museum, Melbourne. 



(Plates xxxi.-xxxviii,, and five Text-figures). 



[Continued from p. 360]. 



Petrolooy ... 363 



Notes ON THE Loo.MKERAH Fossils ... 375 



Bibliography 382 



PAL.i<:oxTOLoaicAL Appendices 385 



Petrology. 



The only rocks of ypec-ial interest, to which attention will be 

 devoted in the sequel, are the massive Devonian Igneous rocks. It 

 was hoped to make a complete study of the rocks which occur as 

 traginents included in the coarse Silver Gully Agglomerate and 

 the Scrub Mountain Conglomerate, but the securing of sufficient 

 material was prevented by want of time. The attention of future 

 investigators is directed to this point. Of the massive rocks, we 

 find, in this region, several types not elsewhere noted in the 

 Middle Devonian Series, namely, hypersthene-dolerite ; porphyritic 

 dolerite with basic felspar; various types intermediate between 

 doleriteor spilite, and keratophyre; a semiperlitic variolite; and a 

 peculiar pseudospherulitic or blotched, silicified, pyroxenic kerato- 



