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21. Nar Nar Goon North - Granite Corestones

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

Location:Nar Nar Goon - 741912. One kilometre east of Nar Nar Goon North.

Image: Sites of Significance Port Phillip Bay
Excavated granite corestones, Nar Nar Goon North.

Access:
Warren Road off Nar Nar Goon Road.

Ownership:
Private land.

Geology/Geomorphology:
The crest of a small hill has been quarried for granitic sands, the depth of the cut averaging two metres. The quarry has exposed a number of well-rounded granite corestones up to 2.5 metres diameter and these remain at the site. The exhumed corestones illustrate one stage in the process of boulder or tor development in these rocks.

Significance:
Regional. The site allows assessment to be made of the depth at which corestones form and clearly shows the process of sub-surface weathering and rounding of boulders re exposure at the surface.

Management:
Class 2. Extensive reclamation of abandoned quarry areas would conceal the significant features at the site. There is minimal erosion risk at the site and as reclamation is not desirable or necessary it should not be permitted.

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