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151. Almurta - Mesozoic/Older Volcanics Contact

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:
Grantville - 751451. The bed and western bank of the channel of the Bass River seven hundred metres north-east of the road bridge at Almurta.


Access:
Grantville to Almurta road.

Ownership:
Crown Land (Public Land Water Frontage Reserve).

Geology:
The geological quarter sheet number 34 S.E. (Mines Dept. 1901.) indicates that the junction between the Mesozoic sediments and the Older Volcanics basalt occurs in the river bed at this locality. The channel margin at the site is now densely overgrown and the contact was not located during this survey. The Bass River valley here includes two sets of paired terraces typical of the extensive terrace sequence of this river.

Significance:
Regional. The absence of sub-basaltic sediments between the Mesozoic rocks and the overlying Older Volcanics is unusual in the study area.

Management:
Class 3. Diversion or filling of the river channel will further obscure the site and should not be permitted.
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