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6. Thomson River Anabranch - Myrtlebank

This information has been developed from the publications:

  • Sites of Geological and Geomorphological Significance in Central Gippsland (1981) by Neville Rosengren, M.S McRae-Williams and S.M Kraemers,
  • Sites of Geological and Geomorphological Significance on the Coast of Port Phillip Bay and in the Catchment of Westernport Bay (1984, 88) by Neville Rosengren.
  • Sites of Geological and Geomorphological Significance in the South Gippsland Marine and Coastal Parks (1989) by Neville Rosengren.
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 (external link) section of the Geological Society of Australia website for details of geological heritage reports, and a bibliography.

Location:025845. Five kilometres north-west of Sale.Sites of Geological & Geomorphological Significance - Figure 19
Sites 8321-5 6

Access:
Myrtlebank-Fulham Road.

Ownership:
Private Land.

Geology/Geomorphology:
An anabranch of the Thomson River has developed on the eastern side of the floodplain five kilometres north-west of Sale. The valley here is a complex meander plain with traces of three main channel systems. The oldest channel occupies the centre of the floodplain and has low sinuousity. Only a few abandoned meanders developed from this channel, in contrast with the numerous ox-bow lakes adjacent to the second (anabranch) channel on the eastern side of the floodplain. The present channel is undercut against the western edge of the floodplain.

Significance:
Regional. This is one of the best examples of anabranch development in the Gippsland stream. Detailed analysis of the meander complexity of the Thomson River and comparison with that of the anabranch would allow an assessment to be made of the time of separation of the two channels.

Management:
Channel straightening and drainage of meanders and cut-offs of either channel would reduce the value of the site for fluvial geomorphological analysis and should not be permitted.
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