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Quarry Hill

This information has been obtained from the report: Eruption Points of the Newer Volcanic Province of Victoria by Neville Rosengren. This report was published in 1994 and was prepared for the National Trust of Australia (Victoria) and the Geological Society of Australia (Victorian Division). The review of eruption points was based on an earlier unpublished manuscript Catalogue of the post-Miocene volcanoes of Victoria compiled by O P Singleton and E B Joyce (Geology Department, University of Melbourne 1970).

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 value. 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.

Location:Colac Quarry



38 20 00S 143 38 00E (external link); 7621-3-1 (Irrewarra) and 7621-3-4 (Colac) 299542. 2 km E of Colac. Triggs Road and Princes Highway. Colac

Land Tenure/Use:
Private land. Triggs Road crosses summit. Old basalt quarry. Exposures in cutting on Princes Highway.

Type 9:
Composite lava and scoria volcano.

The site is a broad low mound of interbedded lava and scoria overlying pyroclastics. There are good exposures of ejects from this volcano in disused quarries along Triggs Road, in cuttings by the Princes Highway and on the shore of Lake Colac near the Sewage Treatment Plant. At this latter site they overlie lake sediments. The eruptions represent an earlier phase of activity of the Newer Volcanics but post-date the formation of Lake Colac.

189 m; 15 m.

Regional:
The site is representative of an early phase of volcanic activity in the Colac region. The significance is based on the very clear exposures at the localities mentioned.

Reference
Gill, E.D. 1964. Rocks contiguous with the basaltic cuirass of western Victoria. Proceedings of the Royal Society of Victoria 77, pp. 331-355.
Tickell, S.J., Cummings, S., Leonard, J.G. & Withers, J.A. 1991. Colac 1:50 000 map geological report. Geological survey of Victoria Report 89.
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