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215. Elizabeth Island

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:Rhyll - 575465. 1 km east of Long Point.
Image: Sites of Significance Westernport Bay
Elizabeth Island is surrounded by low
bluffs and shore platforms

Access:
By boat only. Recommended access is at high tide onto the rocky beach at the southern end of the Island.

Ownership:
Private land and Crown land.

Geology/Geomorphology:
Elizabeth Island is geologically continuous with the main island as it is composed of Tertiary Older Volcanics with a small outcrop of Lower Cretaceous sediments at its northern tip. The island is separated from the main island by inter-tidal mudflats and a tidal channel. The shoreline of the island is a narrow, rock-strewn low tide shore platform cut in basalts and Mesozoic sediments, in front of a low vegetated bluff. A small pocket of mangroves and salt marsh occurs in a sheltered site on the eastern coast of the island.

Significance:
Regional. The volcanics of Elizabeth Island may represent a later stage of the Tertiary volcanic sequence as the petrology of the basalt appears different from that found on French Island. Preservation of the restricted outcrops of this possibly later volcanic suite is recommended for future research investigations.

Management:
Class 2. To preserve the extent of outcrop on the island it is recommended that no quarrying of basalt be permitted.

Image: Sites of Significance Westernport Bay
Elizabeth Island. Low vegetated bluff with salt marsh terrace overlying a former shore platform. Mangroves occupy the seaward edge, Site 215.
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