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G31 - Diversion Tunnel

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: 948244.
Image: Upper Yarra Sites of Significance
 Rock bending due to soil slumping above diversion
tunnel at Site G31.

Access:
Warburton - Woods Point Road.

Geology/Geomorphology:
A narrow meander spur exposes beds of Norton Gully sandstone that strike north-north-west. A diversion tunnel links the river channel through the neck of the spur although flow is still maintained around the meander loop. The tunnel provides clear exposure of the bedrock of the Upper Yarra Valley. An example of rock bending due to soil slumping can be seen on the western tunnel portal.

Significance:
Local. (See Site G32).

Management:
Class 2. Maintenance of the access tracks to divert traffic away from the areas prone to soil slumping is necessary.


G31 Diversion Tunnel
diversion Tunnel
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