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162. Cooke Hill - Mesozoic Sediments

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:Korumburra - 982515. Six kilometres north of Korumburra south of the junction of the Poowong to Ranceby road.

Image: Sites of Significance Port Phillip Bay
Scour channel (arrowed) in Mesozoic sediments at Cooke Hill.

Access:
Warragul to Korumburra road.

Ownership:
Crown Land.

Geology:
Several cuttings on the Warragul to Korumburra road provide one of the most extensive inland sections available in the Westernport Bay catchment of the Mesozoic sedimentary rocks. The cuttings are on the western slopes of Cooke Hill and extend for several hundred metres south from the junction with the Poowong road. The sections were measured and described in some detail of the beds. The sections include massive sandstones up to five metres thick, thinner bedded carbonaceous mudstones and siltstones, and seams of black coal. Power (1971) referred to this section as displaying excellent examples of the sedimentary processes occurring in the Mesozoic depositional basin. These examples include a large scour channel with calcareous concretions and a mud pebble conglomerate, and a slumped and deformed cloak of arkose contained within these fill deposits.

Significance:
State. The section is one of the best exposed and documented of the inland exposures of Mesozoic sediments in the Westernport Bay Catchment.

Management:
Class 1. The site illustrates the difficulty of maintaining exposures on artificial slopes such as road cuttings. The Mesozoic rocks weather quickly. Without some process to remove the accumulated weathered material and vegetation, the section has quickly become obscured. To maintain the significance of the site it will be necessary to periodically mechanically clear the face. Artificial materials should not be placed on the slope to stabilise it as this would further cover the rock exposure.

References:
Tickell, S.J., 1971. The geology of the Bass River Area. B.Sc. Hons thesis (unpub.) Dept. of Geol. Univ. of Melb.
Power (1971).

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