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105. Athlone - 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:
Ripplebrook - 920676. Seven kilometres east of Heath Hill.

Image: Sites of Significance Port Phillip Bay
River-cut bluff on northern side of Lang Lang River valley, Athlone.

Access:
Cliftons Road.

Ownership:
Private land and Crown Land (Public Land Water Frontage Reserve).

Geology/Geomorphology:
The Lang Lang River is incised into the uplifted fault block west of the Heath Hill scarp. The valley profile is markedly asymmetrical with a steep and in places undercut erosion bluff on the northern side, but the southern valley slope lacks a distinct river-cut bluff. The valley is alluviated with a flood plain 500 to 700 metres wide, the river channel occupying the northern side of the flood plain. The depth of stream channel incision increases towards the west as the knickpoint referred to in Site 100 is approached. This knickpoint will continue to extend upstream resulting in a deepening and widening of the river channel. The broad valley and degree of alluviation of the Pheasant Creek is suggestive of back tilting of the fault block east of the Heath Hill Fault (Jenkin, pers.comm.).

Significance:
Regional. The site encloses terrain that is of major importance in elucidating the tectonic and erosional history of the western margin of the South Gippsland Highlands.

Management:
Class 3. Changes in land use will not affect the significant features of the site. The progress upstream of the knickpoint will pose a hazard to the stability of the flood plain banks (Bird 1981) and should be carefully monitored.

References:
Bird, J. F. , 1981. Geomorphological implication of flood control measures, Lang Lang River, Victoria. Aust. Geog. Stud. 169-183.
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