Art. XVI. — Tlie Geology of Mount Macedon, Victoria. 

 By J. W. GREGORY, D.Sc, F.R.S., 



Professor of Geology in the University of Melbourne. 



(With Plates XI.-XVIL). 



[Eead 18th July, 1901]. 



I. — Introduction - - - - - - - 185 



II.— The Geographical Features of Mount Macedon - 186 



III. — Geological Literature on Macedon - - - 189 



IV.— The Petrography of Mount Macedon - - - 190 



1. The Plutonic Rocks of the Palaeozoic 



Platform 191 



2. The Rocks of the Macedon Series- - 193 



a. Geburite-Dacites - - - - 193 



/?. Trachy-Phonolites - - - - 197 



c. Solvsbergites - - - - - 198 



d. Andesites - - - - - 199 



e. Agglomerates and Ash - - - 199 

 V. — Chemical Composition . . . . . 200 



VI.— The Relations of the Macedon Rocks - - - 202 



VII.— The Geological Structure of Mount Macedon - 205 



VIIL— Allied Eruptive Centres in Victoria - - - 209 



IX.— The Age of Mount Macedon - - - - 212 



Summary - - - - - - - -214 



References- - - - - - - -214 



Description of Plates - - - - - -.216 



I. — Introduction. 



Mount Macedon is an isolated mountain ridge which, though 

 seen at a distance of 40 miles, is one of the most conspicuous 

 features in the views from Melbourne. Its hum mocked crest 



9v 



