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48. Sandstone Island - Silurian Outcrop

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:
Tyabb – 4374560. Approximately 600 metres north-east of Jacks Beach.
Image: Sites of Significance Westernport Bay
 Sandstone Island. Main mangrove area (A) and steeply dipping Silurian sediments (B)

Access:
Access is only possible by boat even at low tide. Landings may readily be made at several points on the island.

Ownership:
Sandstone Island is an outcrop of Silurian sandstone and mudstone beds folded into an anticline with a steep southerly plunge. The strata are best displayed in out crops as shore platforms on all sides of the island. Sandstone island has a broad gently undulating surface up to 14 metres above the sea level and is bordered by steep, grassy coastal bluffs up to five metres high. The bluffs display landslip scars and terraces, and there are small cliffed sectors on the eastern and western side exposing bedding planes in the Silurian rocks. Mangroves are extensive on the sheltered north-western shore but elsewhere they occur only in small patches.

Geology/Geomorphology:
State. The island is a major exposure of Silurian strata and one of the few coastal outcrops of this material in the state.

Significance:
Class 2. The principal geological interest in the island is the outcrops in the coastal cliffs and platforms, especially on the southern half of the island. Covering of these by coastal engineering or harbour works should not be permitted.

48. Sandstone Island - Silurian Outcrop
Sandstone Island morphological
map showing structure of Silurian
outcrops, Site 48
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