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L8 - Council Trench - Triassic Sediments

This information has been developed from this publication:

  • Sites of Geological and Geomorphological Significance in the Western Region of Melbourne (1986) by Neville Rosengren
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:Lerderderg - 717285. Shire of Bacchus Marsh. Hillslope north of Tramway Lane, 4.5 km northwest of Bacchus Marsh.
Image: Sites of Significance Werribee L8
Council Trench - Triassic Sediments

Access:
Tramway Lane.

Ownership:
Crown Land (Shire of Bacchus Marsh).

Site Description:
The site is a shallow pit 40 m long and 3 m deep cut into the side of the ridge extending south from Bald Hill (Bacchus Marsh). The cut has long been known as the Council Trench. It exposes a section of felspathic sandstone and lenses of conglomerate with pebbles up to 2 cm in diameter. The conglomerate differs from that in the Permian glacial formations, in that the pebbles are more rounded and are predominantly quartz. Poorly preserved plant remains in the sediments indicate it is Triassic in age. The outcrop is of very limited extent and is confined to an area of about 3 hectares.

Significance:
State. The small exposure is the only recorded outcrop of Triassic rocks in Victoria and forms the type section of the Council Trench Formation. It is a very frequently used geological testing site in tertiary institutes.

Management:
Webb JA and Archbold N (in prep);
Roberts PS (1984, 1985)
Douglas JG (1969, 1973)
Chapman F (1927)

L8 Council Trench
Site - L8

Related Links

A paper on the Bacchus Marsh Council Trench and its geological significance and recent conservation (external link) is available for download from the Geological Society of Australia website.

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