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G32 - Big Peninsula (Paces Leap) - Diversion Tunnel and River Gravels

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 link) section of the Geological Society of Australia website for details of geological heritage reports, and a bibliography.

Location:AMG Ref: 957261.
Image: Upper Yarra Sites of Significance
Red/yellow river sands overlying imbricate river
gravels at Site 32.

Access:
Peninsula Road.

Geology:
The Big Peninsula is a narrow spur of steeply dipping beds of the Norton Gully Sandstone formation. There is good and accessible exposure of the beds on both sides of the spur at the diversion tunnel. A complex history of river deposition and erosion is evident at this site. A section in the river terrace opposite Paces Leap reveal imbricate river gravel beds overlain by fine red-yellow river sand and silt.

Significance:
Regional. The site clearly illustrates the transverse nature of the river course in relation to regional structure. The narrow necked entrenched meander can be used as a model to show the process of isolation of entrenched meander loops. The section in the terrace is a clear and easily accessible example of types of channel sediment in the upper valley of the Yarra River.

Management:
Class 2. The site is a useful reference locality to illustrate the processes of incision-aggradation of the upper valley of the Yarra River. The features of interest are robust and public access to the area should be maintained. No excavation or construction should be permitted in the area of the site.

Image: Upper Yarra Sites of Significance
 Diversion tunnel along the strike of beds of Norton Gully sandstone at Paces Leap (Big Peninsula) at Site 32.
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