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Bb5 Murgheboluc - Barwon River Abandoned Channels

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 (external link) section of the Geological Society of Australia website for details of geological heritage reports, and a bibliography.

LocationBannockburn - 500790. Former Shire of Bannockburn. North of the Hamilton Highway and at the rear of the recreation reserve at Murgheboluc, 7 km east of Inverleigh.

Bb5 - Barwon River abandoned channels

Access
Hamilton Highway.

Ownership
Private land.

Site Description
Depressions and wetlands at the base of a high arcuate bluff are abandoned channels of the Barwon River. Upstream, the Barwon is confined in a gorge cut in basalt from Mount Pollock but at Murgheboluc there is no lava on the northern side of the valley and the valley has widened in the less resistant Fyansford Formation and overlying Moorabool Viaduct Sands. The valley widening occurred while the river was blocked and diverted by a Newer Volcanic lava flow; eventually the river re-established an incised course through the younger lava and the northern part of the widened valley was abandoned.

Significance
Regional. The site illustrates an unusual place in the development of the Barwon River and shows the importance of rock resistance in determining the form of the valley.

Management
Class 2. The wetlands should not be drained or filled and the topography should be retained in its undulating form to display the character of the former river channels.


Image: BB5
BB5, Site of Geological and Geomorphological Significance

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