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Sb6 Evans Creek, Sunbury - Basalt Outlier

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.

Location


Access

Ownership		Sunbury - 992440. Shire of Bulla. West of Jacksons Creek and north of Evans Creek approximately 6 km north of Sunbury railway station.

Racecourse Road.

Private land

Site Description
The eastern end of the narrow interfluve north of Evans Creek is capped by a small outlier of Newer Volcanics. The capping is about 20 m thick and rests and steeply dipping Silurian sediments and although the contact is masked by colluvium, the change in rock type is evident from the outcrops and soil types seen.
There is a small scarp at the eastern end of the basalt outlier facing Jacksons Creek. Graptolite fossils have been collected from the Silurian sediments outcropping in Evans Creek below the basalt outlier.

Significance
Regional. The site is a clear example of the processes and forms of valley development of Jacksons creek where it has dissected the volcanic plain north of Sunbury.

Management
Class 2. Residential subdivision should not be permitted above the 280 m contour in the site. Outcrops of Silurian sediment on the lower slopes of Evans Creek should not be covered by landfill nor should the channel be artificially lined or stabilized.
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