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23.1 Johanna Dune

This information has been developed from the publications:

  • 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 Geological and Geomorphological Significance in the Shire of Otway (1984) 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 site) section of the Geological Society of Australia website for details of geological heritage reports, and a bibliography.

Location:23-074065. Johanna Beach.

Dune complex at Johanna River. Several distinctive
saucer shaped dune blow-outs occur on the crest of
the main dunes.

Access:
Red or Blue Johanna Road.

Ownership:
Crown land and some private land.

Geomorphology:
At least two episodes of parabolic dune formation have invaded the lower valley of the Johanna River and Stafford Creek forming a complex of overlapping dune ridges. The dunes have defeated the streams and closed a former outlet at the west of Johanna Beach. The ponded streams have deposited an alluvial plain in their lower valleys but subsequent breaching of the dunes has allowed this plain to become deeply incised.

The Johanna River has an outlet and lower course defined by the shape of the northern and eastern margins of the dune ridges. This course has become stabilised following the cessation of movement of the dunes. Blow-out and transgressive dune activity is now limited although several closed basin blow-outs are developing on the dune crest.

Significance:
Regional. The valley shows clearly the influence of faulting, sea level change and successive episodes of dune formation. As such it is an important site to illustrate common factors in coastal evolution. The small dune complex is of interest for the influence it exercises on stream direction and for the relative inactivity at the present time of the parabolic dunes. The basin blow-outs are also uncommon in Victoria.

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