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9.3 Older Volcanics Basalt Plug - Gellibrand

This information has been developed from the publications:
  • Sites of Geological and Geomorphological Significance in the Western Region of Melbourne (1986) by Neville Rosengren
  • Sites of Geological and Geomorphological Significance on the Coast of Port Phillip Bay (1988) by Neville Rosengren.
  • Sites of Geological and Geomorphological Significance in the Shire of Otway (1984) by Neville Rosengren.
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 (external site) section of the Geological Society of Australia website for details of geological heritage reports, and a bibliography.

Location:9-266317. One kilometre east of Gellibrand.

Hill of Older Basalt near Gellibrand

Access:
Off Lardners Track.

Ownership:
Private land, and Crown land (River Reserve).

Geology/Geomorphology:
A prominent rounded hill on the north of the Gellibrand River is a small plug intrusion of Older Volcanic basalt. The southern face of the hill is a steep bluff rising over 100 metres above river level. Basalt is exposed at places on the bluff and along with an indurated sandstone comprises the major source of boulders and gravel in the river bed. On the north western side of the hill, an outcrop of fine grained and hard basalt has been worked as an aboriginal axe quarry.

Significance:
State. This is the most obvious of the Older Volcanic outcrops in the Gellibrand district which constitute the westernmost Older Volcanic rocks in Victoria. A potassium - argon date on this rock revealed an age of 27.8 million years (Bowen, 1974). The physiographic control exercised by the basalt on the river course is very obvious.

References:
Bowen, D.Q. 1974 'The Quaternary of Wales.' IN: Owen, T.R. (ed.) The Upper Palaeozoic and Post Palaeozoic Rocks of Wales. University of Wales Press,

Image: Betonite Quarry map
Map of Gellibrand and Sites 9.3, 9.4, 9.5, 9.6
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