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147. St. Helier - Volcanic Pipe

This information has been developed from one or more of these publications:

  • Sites of Geological and Geomorphological Significance in the Westernport Bay Catchment (1984) by Neville Rosengren.
  • 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 Environmental Significance in the Flood Plain of the Upper Yarra Valley Region (1983) by Neville Rosengren, Douglas Frood and Kim Lowe (as part of a study of Sites of Environmental Significance by the University of Melbourne for the then Upper Yarra Valley and Dandenong Ranges Authority).
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 (external link) for details of geological heritage reports, and a bibliography.

Location:Grantville - 783494. Four kilometres north of Kernot.

Image: Sites of Significance Port Phillip Bay
Volcanic pipe, St. Helier.

Access:
Nyora - St. Helier Road.

Ownership:
Private land.

Geology:
A small body of basic igneous rock has been quarried at this site and the rock is exposed in one quarry face. The material has been described as crinanite (Edwards, 1934), and the composition and dimensions of the outcrop indicate it is a small volcanic pipe intruded into Mesozoic sediments.

Significance:
State. The pipe is an important and rare exposure of igneous material of this nature. Very few eruption or emplacement centres of this nature are known in the Older Volcanics.

Management:
Class 2. Further quarrying or reclamation or filling of the quarry should be permitted only on the condition that provision is made for retaining the face that displays the contact of the Mesozoic rocks and intrusive material.

References:
Edwards, A.B., 1934. Tertiary dykes and volcanic necks of South Gippsland, Victoria. Proc. Roy. Soc. Vic. 47(1) 112-132.
Power (1971).

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