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11. Glen Nayook Granite Caves

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

Location:Neerim – 067015. Tarago River East Branch two kilometres west of Neerim Junction.

Access:
Paynters Road.

Ownership:
Crown Land.

Geology/Geomorphology:
Two stream passage caves occur in the Tarago River East Branch channel. The bedrock in the channel is Tynong Granite. The stream passages may be developed around corestones of granite boulders and extend for approximately 100 metres. There are several vertical entrances and stream sinks but the caves are largely impassable and their length, dimensions, and mode of origin has not been investigated in detail.

Significance:
State. The extent of cave development in granitic rocks has only recently been recognised. There has been little scientific investigation of the mode of origin and rate of cave development in these rocks and all recorded sites must be regarded as being high significance.

Management:
Class 1. Cave sites are extremely sensitive to disturbance, both from activities above ground and from changes in the streamflow or groundwater regime. No dumping of rubbish, quarrying, earthworks, construction or stream diversion works should be permitted in the area of the site.
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