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La5 Port Lillias and Bird Rock - Lava Coastline

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 link) section of the Geological Society of Australia website for details of geological heritage reports, and a bibliography.

LocationLara - 757808. Former Shire Corio. Peninsula 2 km east of Limeburners Bay.

La5 - Low basalt bluff and emerged shell beds, Point Lillias.


Access
Avalon Road.

Ownership
Private land and Crown land.

Site Description
Point Lillias is a narrow peninsula formed by a southward trending ridge of lava of the volcanics of the Werribee Plains. The seaward end of the ridge forms a low bluff fringed by shelly beach ridges. 500 m seaward is a small basalt island (Bird Rock) that indicates the original extent of the lava tongue. In the intervening area, a sandy bar has accumulated on the submerged basalt surface linking Bird Rock to Point Lillias. The bar is completely subaqueous

Significance
Regional. Point Lillias is one of the few rocky peninsulas in the study area and illustrates the development of coastal features on a lava surface. Although all the coastline of the study area has developed by the drowning of the edge of the Werribee lava plain, Bird Rock is the only emerged, offshore remnant of the lava flows.
Management
Class 2. Quarrying, road works, jetty, residential or other constructions should not be permitted in the area of the site. The open water link between Bird Rock and Point Lillias should be maintained and dredging of, filling or building coastal structures across this area should not be permitted.
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