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118. The Gurdies - Heath Hill Fault

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:
Lang Lang and Grantville - 762581. One kilometre east of The Gurdies.

Access:
Bass Highway or Gurdies Road.

Ownership:
Crown Land.

Geology/Geomorphology:
Outcropping in the creek valley are clays and coarse sands of the Baxter Formation overlying Older volcanics. The volcanics exposed in stream channel are fractured and sheared and the sedimentary beds which are well exposed in several quarries dip steeply to the west, this dip being imparted by drag movement on the Heath Hill Fault (McMickan, 1977).

Significance:
Regional. The site displays the geology of the southern section of the Heath Hill Fault, provides evidence of fault movement and indicates the age and stratigraphic relationships of the gravels on the scarp.

Management:
Class 2. Quarrying could be permitted at the site as this would increase the exposure of Tertiary beds. Reservoir construction or extensive building works should not be permitted as this would obscure the available outcrop of older Volcanics in the creek valley. Road and bridgeworks should be designed to minimise impact on the bed exposures.

References:
McMickan (1977).
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