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D2 Mount Ridley - Twin Eruption Point

This information has been developed from the publications:

  • Sites of Geological and Geomorphological Significance in the Western Region of Melbourne (1986) by Neville Rosengren
  • Sites of Geological and Geomorphological Significance on the Coast of Port Phillip Bay (1988) by Neville Rosengren.
  • Sites of Geological and Geomorphological Significance in the Shire of Otway (1984) by Neville Rosengren.
Geological heritage sites, including sites of geomorphological interest and volcanic heritage sites, are under regular revision by the Geological Society of Australia, especially in the assessment of significance and values. Reference should be made to the most recent reports. See the Earth Science Heritage section of the Geological Society of Australia website (external link) for details of geological heritage reports, and a bibliography.

LocationDonnybrook - 175389. Shire of Bulla. Three kilometres north of Craigieburn and west of the Hume Highway.

Access
Mount Ridley Road.

Ownership
Private land.

Site Description

Mount Ridley is a volcano with two vents approximately 600 m apart. Both vents are flat domes without craters or conspicuous eruption features, the northern dome being the younger at its lava overlies that from the southern dome. The flows spread mainly to the north and east. Sections of the younger flows are exposed in small quarries on the eastern slopes of the northern dome. The lava has a minimal assemblage which is one of the less common in the Newer Volcanic rocks of Victoria.

Significance
Regional. The unusual nature of the mineral assemblage and the twin eruptive centres are the distinctive features of this site.

Management
Continued rural land use will maintain the significant features of the site, or it could be used as public open space area. Residential subdivision or extensive quarrying would lead to degradation of the site by destroying or covering the eruption points.

References
Hanks, W. (1955). Newer Volcanic Vents and Lava Fields between Wallan and Yuroke, Victoria. Proc. R. Soc. Vict. 67:1-15.

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