rPRoc. Roy. Soc. Victoria, 26 (X.S.). Pt. II., 1914.] 



Art. XXW.—On the Geolorjn and Petrolo<j>j of the Distrirt 

 between Lili/dale and Mount Dandenong. 



By MORRIS M0RRI8, M.Sc. 



(Formerly Kernot Resoai-ch Scholar, and Caroline Kay Scholar in Geoloiiy, 

 University of Melbourne.) 



(With Plates XXIX., XXX. and XXXI.) 



[Read 13th Noveiiil)er, 1913.] 



Contents. 



I. The Introduction. 



II. Previous Work. 



III. The Upper Silurian Sediments. 



IV. The Late Palaeozoic I^jneoixs System. 



A.— V^oLCANic Phase. 



(a) Lower Toscanite Series. 



(b) Upper Toscanite Series. 

 fc) Lower Dacite Series. 



(d) Middle Dacite Series. 



(e) Upper Dacite Series. 



(= Hypersthone Dacite Series.) 



B. — Plutonic Phase. 

 C. — Htpabyssal Phase. 



(a) The Differentiated Dykes. 



(b) 'J'he Undifferentiated Dykes. 



D.— The Volcanic Succession. 



K. — Nomenclature of the Igneous Rocks. 

 V. Faults. 

 VI. The Tertiary lyjneous System. 

 VII. Summary. 

 VIII. Bibliography. 

 IX. Description of Plates. 



I.— Introduction. 



The area to be described lies about 2.3 miles east of Melbourne. 

 It is a rectangular block of some 36 square miles, with its southern 

 base line passing east and west across the Trig Station on Mt. Dande- 



