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16 Indented Head South - Deep Weathering

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 for details of geological heritage reports, and a bibliography.

Location998747. Coastal cliff 500 m south of Indented Head.
Image: Sites of Significance Port Phillip Bay
Site 16, Weathered sediments at bluff south
of Indented Head
AccessThe Esplanade, Indented Head.
Ownership/Managing AuthorityCrown land.

Site Description
An active coastal cliff is cut in a soft, deeply weathered, strongly mottled sand and sandy clay rock. The material does not form ferruginous pebbles but fallen and slumped material is dispersed by wave action. The cliff face is dissected by narrow, closely spaced rills. In paces there are layered deposits of shells and ferruginous gravel at the cliff base, indicating long periods of accretion of material derived from adjacent coastal sectors.

Significance
Local. The cliff contrasts with harder rock cliffs at Indented Head and The Bluff. The layered shells and gravels present an interesting field interpretation problem as to source and mode of deposition.

Management Considerations
Class 2. The cliff is not an erosion hazard, is not dangerous, and erosion rates do not pose a threat to property. There should be no engineering works constructed, either as protective or stabilization measures, and beach nourishment should not be undertaken at the site. If roadworks or landscaping take place at the cliff top, care should be taken to avoid loose rubble covering the slope foot deposits of shells and gravel at the northern end of the site.

Image: Sites of Significance Port Phillip Bay
Site 16, Layered beach deposits south
of Indented Head
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