K5 Keilor North - Intra-basaltic Sediments

This information has been developed from the publications:

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 Geological and Geomorphological Significance in the Shire of Otway (1984) 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 section of the Geological Society of Australia website (external link) for details of geological heritage reports, and a bibliography.

Location

Keilor - 066268. Former City of Keilor. Maribyrnong River valley 4 km north of Keilor.

Access

Sydenham Park

Ownership

Private land

Site Description

The steep southern valley slope of the Maribyrnong River exposes sub-basaltic and intra-basaltic silicified sediments. The sedimentary beds are angular siliceous fragments set in a matrix of sub-rounded coarse to fine sands. The upper contact with the basalt is well exposed. The basalt is strongly jointed, both horizontally and vertically, and is vesicular with many vesicles infilled with zeolites. On the upper slopes, a sedimentary bed 1.5 m thick is enclosed between later lava flows.

Significance

Regional. The site is a clear example of sub-basaltic and intra-basaltic silicified sediments.

Management

Class 2. The site should be left free from dense tree plantings or other forms of slope stabilization that would obscure the form of the outcrops.

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