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122. Topram - Lang Lang River Valley

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:
Poowong - 963634. Twelve kilometres south of Drouin South.

Image: Sites of Significance Port Phillip Bay
Beheaded valley (arrow), structural or erosion bench (A), Lang Lang River floodplain.

Access:
Main South Road.

Ownership:
Private land.

Geology/Geomorphology:
The Lang Lang River occupies a confined flood plain bounded by well defined valley side bluffs. These are cut in Mesozoic sediments which outcrop in the cuttings of the Main South Road to the east of the river. On the northern valley slope is a slumped area which is an outcrop of Childers Formation overlain by weathered tuffs and basalts of the Older Volcanics. The northern valley slope of the tributary that lies south of the Torwood - Topiram road has a broad bench or terrace 10 to 150 metres above the level of the flood plain. This may be a structural terrace, or it may be an abandoned or captured higher level valley floor remnant of a former northward draining stream now beheaded by the Lang Lang River.

Significance:
Regional. The site is of interest for the outcrop of Tertiary rocks and the unusual nature of the valley slope bench.

Management:
Class 3. changes in land use will nor reduce the nature of the significant features at the site.
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