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101. Athlone - Lang Lang River Knickpoint

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:Nyora - 866651. Fifteen hundred metres upstream from the Heath Hill road bridge.

Image: Sites of Significance Port Phillip Bay
 Knickpoint (arrowed) of Lang Lang River at Athlone.

Access:
Lyons Road.

Ownership:
Crown Land (Public Land Water Frontage Reserve).

Geomorphology:
The site marks the limit of headward erosion of the Lang Lang River following rejuvenation subsequent to drainage and diversion works downstream. The knickpoint in the channel is formed in a firm sand strata that is being incised by the stream to develop groups of small potholes. Coalescence of these allows the knickpoint to retreat upstream to develop groups of small potholes. Overlying the firm sand material is a thin layer of coarse sand and grit and above this a bed of silt and sand over one metre thick containing many logs and other woody plant fragments.

Significance:
State. The site is of major importance in illustrating the rate and mechanism of retreat of the erosion head of the Lang Lang River. The steep banks display an important stratigraphic section of phases of late Quaternary sedimentation in the Lang Lang valley.

Management:
Class 2. Private unplanned and unco-ordinated erosion control works should not be permitted, as dumping of rock and other material will obscure the geologically important sections in the stream channel and banks. Consultation should be made with geomorphologists familiar with the nature of channel and bank erosion rates before any reclamation works are undertaken at the site.

Image: Sites of Significance Port Phillip Bay
 Knickpoint of Lang Lang River at Athlone.
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