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8524- 5 Copperhead Creek

This information has been developed from the publications:

    • Sites of Geological and Geomorphological Significance in Central Gippsland (1981) by Neville Rosengren, M.S McRae-Williams and S.M Kraemers.
    • Sites of Geological and Geomorphological Significance in the Gippsland Lakes Catchment (1984) by Neville Rosengren.
    • Sites of Geological and Geomorphological Significance in East Gippsland, Victoria (1981) by Neville Rosengren, M.S McRae-Williams
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:
020260. Three kilometres north of Mount Cobberas No. 2.

Image: East Gippsland Sites of Significance
Tin Mine Creek at Copperhead Creek. Incandescent tuff flow of Snowy River Volcanics, including sub-rounded clasts of diverse lithology (A).

Abstract:
Unconformable contact between Snowy River Volcanics and Cowombat Siltstone, incandescent tuff.

Access:
Cowombat Track (Tin Mine Road).

Ownership:
Crown Land

Geology:
A low road cutting in Cowombat Track, near the Copperhead Creek crossing exposes the unconformable contact between Cowombat Siltstone and Snowy River Volcanics. At this locality, near vertically dipping siltstone is overlain by near horizontal Volcanics. The siltstone has been altered along the contact and pronounced cleavage has developed.

The Snowy River Volcanics at this locality are of particular interest as they provide a graphic example of an incandescent tuff, (Plant 226). The tuff includes rounded and sub-rounded boulders and angular fragments of rhyodacite and country rock, such as shales and slates bound in a fine greyish matrix. The rounded boulders represent stream deposits picked up during the eruption.

Significance:
Regional. The exposure of the incandescent tuff clearly demonstrates that explosive phases occurred in the eruption of the Snowy River Volcanics. Clearly exposed contacts between the Snowy River Volcanics and the Cowombat Siltstone are uncommon in the region.

Management:
The site would be enhanced by the maintenance of clear faces on the road cuttings of the Cowombat Track.

References:
McAndrew, J. and Marsden, M.A.H. (eds) 1973. Regional guide to Victorian Geology. Second Edition, School of Geology, University of Melbourne.


8524 5 to 6
Sites 8524 5-6

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