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95. Lang Lang - Lang Lang River Incision

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:
Bayles - 773673. Five kilometres north-east of Lang Lang.

Image: Sites of Significance Port Phillip Bay
Alluvium (A) overlying Heath Hill Silsts (B), incised channel of Lang Lang River.

Access:
Edis Road.

Ownership:
Private land and Crown Land.

Geomorphology:
The former course of the Lang Lang river at the western end of Protectors Flats is indicated by a sinuous depression and low sandy levee banks. The river now follows an artificial alignment and occupies a trench over six metres deep. This was initiated as a shallow ditch in the 1870's, as part of a swamp drainage and flood control scheme, and has become incised more deeply since by river scour (Bird, 1981). The incised channel provides a section of the Heath Hill silts disconformably overlain by younger flood plain deposits which contain numerous wood and charcoal fragments. The channel floor is cut into a weakly consolidated sand which forms a temporary basement to further incision.

Significance:
Regional. The site indicates the nature of the Lang Lang River flood plain prior to artificial drainage works, and allows assessment to be made of the impact of these works on river channel form. It provides a major geological section of the Heath Hill Silts and younger alluvial deposits.

Management:
Class 2. The significance of the site is unlikely to be altered by changes in adjacent land use.

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