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Mount Cottrell

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 The review of eruption points was based on an earlier unpublished manuscript Catalogue of the post-Miocene volcanoes of Victoria compiled by O P Singleton and E B Joyce (Geology Department, University of Melbourne 1970).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

Cottril37 46 00S 144 37 30E (external link); 7822-3-4 (Eyensbury) 907177. 4 lm SW of Rockbank.
Image: Eruption Points Mt Cottrell
Mount Cottrell (broad rise on skyline)

Mount Cottrell Road.


Private land.

Grazing, outcrop at summit.

Type 2

Lava shield

Mount Cottrell is a low lava cone resting on a broad lava shield formed by the radial eruption of numerous thin fluid lava tongues. The flows are symmetrically distributed around the vent producing an almost circular shield of considerable bulk although less than around 100 m in height. The massive nature of this mountain is best appreciated when viewed from a distant point such as the You Yangs. The slopes are of low angle apart from the summit area where a bluff of hard dense basalt 5 m high surrounds a shallow crater. The basalt dips in towards the crater with dips to 30
o on the northern side.

205 m; 60 m.


The site is significant in two aspects - the unusual structures at the bluff and crater and the extent of the radial flows, producing a very broad lava shield. This is the most massive of the Werribee Plains volcanoes and one of the largest shield volcanoes in Victoria.


Coulson, A. (1938). The basalts of the Geelong district.
Proceedings of the Royal Society of Victoria 53, pp. 394-402.
Hills, E.S. (1940). The physiograpy of Victoria (1st edn). Whitcombe & Tombs, Melbourne.
Condon, M.A. (1951). The geology of the lower Werribee River, Victoria. Proceedings of the Royal Society of Victoria 63, pp. 1-24.
Ollier, C.D. & Joyce, E.B. (1964). Volcanic physiography of the Western Plains of Victoria. Proceedings of the Royal Society of V ictoria 77, pp. 357-376.
Ollier , C.D. (1967a). Landforms of the Newer Volcanic Provicence of Victoria. In J.N. Jennings & J.A. Mabbutt (eds), Landform studies from Australia and New Guinea. ANU Press, pp. 315-339.
Stewart, G. (1977). The Newer Volcanics lava field between Deer Park and the Werribee River. Geological Survey of Victoria Unpublished Report 1977/26.

Image: Eruption Points Mt Cottrell
Mount Cottrell Summit
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