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Mount Hydewell

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 The review of eruption points was based on an earlier unpublished manuscript Catalogue of the post-Miocene volcanoes of Victoria compiled by O P Singleton and E B Joyce (Geology Department, University of Melbourne 1970).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.

37 38 00S 144 13 30E (external link); 7722-4-2 (Yaloak) 550321. 2 km S of Ballan. Geelong-Ballan Road.

Mount Hydewell



Ballan.

Private land:
Grazing, outcrop on steeper summit.

Type 2:
Lava shield.

Mount Hydewell is a broad lava shield with a small final dome forming the rocky summit. The lavas extend over a broad area. The patterns of lava outcrop suggest there may be a number of closely-spaced eruption points at this site.

537 m: 45 m.

Regional:
This is a representative site to illustrate the development of the broad lava plains south of Ballan. It is an important regional example of a large-volume volcano with low individual eruption points.

Class 2:
Roadworks and buildings on the low angle slopes destroy the visual unity of sites of little relief such as this one.

References:
Fenner, C. 1918. The physiography of the Werribee River area. Proceedings of the Royal Society of Victoria 31, pp. 176-313.
Edwards, A.B. 1938. The Tertiary volcanic rocks of central Victoria. Quarterly Journal of the Geological Society of London 94, pp. 243-320.
Ollier, C.D. 1976a. Landforms of the Newer Volcanic Province of Victoria. In J.N. Jennings & J.A. Mabbutt (eds), Landform studies from Australian and New Guinea. ANU Press. pp. 315-339.
Roberts, P.S. 1984. Explanatory notes on Bacchus Marsh and Ballan 1:50 000 geological maps. Geological Survey of Victoria Report 76.
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