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Gd3 - Mt Blackwood - Eruption Point

This information has been developed from this publication:

  • Sites of Geological and Geomorphological Significance in the Western Region of Melbourne (1986) 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 for details of geological heritage reports, and a bibliography.

Location:Greendale - 668399. Shire of Ballan, 7 km north of Myrniong.

Access:
Mount Blackwood Road.

Ownership:
Private land.

Site Description:
Mount Blackwood is the highest volcano in the study area with a summit elevation of 736 m. It is similar in form to Mount Bullengarook although it lacks the extensive accumulation of scoria around the summit. The volcano erupted in a hilly area of Ordovician rocks and gave rise to lava flows extending to the south, probably filling a former valley. The flow has been dissected and twin lateral stream have developed - Myrniong Creek to the west and Korkuperrimul Creek to the east. The surface of the lava flow slopes steeply where it crosses the line of the Coimadai Fault.

Significance:
Regional. The site includes the summit of the mountain and part of the lateral stream to the east. It is an illustration of the development of relief and drainage pattern determined by volcanicity. The Mount Blackwood summit provides an unequalled vantage point to view the Blackwood Ranges, Mount Macedon, Pentland Hills, and the terrain features of the catchment of the Werribee River.

Management:
Class 3. The site requires a relatively large area to be maintained to show the relationship between the eruption point. This is best achieved by continuing the present pattern of rural land use. Public road or walking access should be provided to the summit of Mount Blackwood and an un-structured viewing point maintained.
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