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Site 18 Coburg Lake - Basalt Structures and Unconformity

This information has been developed from one or more of these publications:

  • Sites of Environmental Significance in the Flood Plain of the Upper Yarra Valley Region (1983) by Neville Rosengren, Douglas Frood and Kim Lowe (as part of a study of Sites of Environmental Significance by the University of Melbourne for the then Upper Yarra Valley and Dandenong Ranges Authority).
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:YARRA 5000/04.09 E209500 N21650
Left bank of Merri creek between 50 and 100 m south of footbridge (2nd footbridge south of Carr Street). The site is a cliff above Coburg Lake.
Access:Carr Street, De Chene Reserve. The site is not directly accessible but may be viewed from the southern side of Coburg Lake.
Ownership & Municipality:Public Land, City of Coburg, Lake Reserve.
Site Description:The site exposes a contact between Melbourne Formation sediments and the overlying Newer Volcanics basalt. Between the two formations is a buried clayey soil. Beneath the basalt, the surface of Silurian rocks dips toward the west indicating to be one side of a pre-basaltic valley now filled with lava.
Significance Rating:Local.
The site is an example of the contact between basalt and Silurian rocks and is a clear example of the ancestral valley of the Merri Creek now filled with lava. The site however is very overgrown and very little contact can be seen.
Site Sensitivity:Class 2.
The site is inaccessible due to the steep and overgrown bank of Coburg Lake. To increase the geological utility of the site, extensive vegetation removal would be required.
References:Schleiger, N. W. 1988, Coburg, in Clark, I., Cook, B. & Cochrane, G. C (eds.) Victorian Geology Excursions Guide, Aust. Acad. Sci., Canberra.
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