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221. Barrallier 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:Barrallier - 524620. 1 km north of French Island.
Image: Sites of Significance Westernport Bay
Long gravel pits (arrowed) on Barrallier Island. Mangroves on sheltered coast (A), Site 221.

Access:
The island is accessible by boat at high tides.

Ownership:
Crown land.

Geology/Geomorphology:
This is a small depositional island built of gravels derived from ferruginous sandstone. The sands and gravels of the island have built up on the tidal flats and may have a basement of Baxter Formation sediments as there are outcrops of this material nearby at Scrub Point on French Island and Crawfish Rock. The higher parts of the island are above high tide level and carry a sparse scrub and grass vegetation and there are mangroves on the sheltered southern shore. Two long gravel spits extend from the island.

Significance:
Regional. Barrallier is one of several small gravelly islands in Westernport whose configuration changes rapidly in response to storms. Longer-term changes have been noted from study of aerial photographs. The island probably represents a higher area in the pre-Holocene terrain now submerged by the waters of Westernport and rests as a basement of ferruginous sandstone similar to that a Crawfish Rock.

Management:
Class 1. Removal of gravels or building of any structure on the island should be prohibited.

Image: Sites of Significance Westernport Bay
Gravel spit, Barrallier Island, Site 221		Sites 221 - 222
Site 221, Barrallier Island and Site 222, Crawfish Rock
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