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130. Poowong - Cruikston Dyke

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:Poowong - 960533. Four kilometres south-east of Poowong.

Image: Sites of Significance Port Phillip Bay
Cruikston Dyke (A) intruding Strzelecki Group sediments (B). Arrow shows contact.

Access:
Poowong to Ranceby road.

Ownership:
Crown Land and private land.

Geology:
A small body of intrusive igneous rock is exposed in the road cuttings at the site. The rock was described by Stirling (1892, 1899) as an olivine gabbro and named the Cruikston Dyke. Edwards (1934) described the material as analcite-olivine-dolerite. The intrusion trends north-west to south-west across the road and the cutting on the north of the road shows the contact between the dyke and the enclosing Mesozoic sediments.

Significance:
State. This is one of the largest dykes in the study area and is of different composition and texture from most other lower Tertiary intrusions in Victoria.

Management:
Class 2. The road cuttings exposing the dyke rock should not be artificially stabilised or vegetated as this would obscure the exposure of the dyke rock and enclosing rocks.

References:
Stirling. J., 1892. Reports on the Victorian coalfields, 1. Spec Rept. Coalfields, Geol. Surv. Vict. 1.
Stirling. J., 1899. Progress report on survey of Quarter Sheet No. 2, Gippsland Carbonaceous area. Spec. Rept. Coalfields, Vict. No. 2.
Edwards, A.B., 1934. Tertiary dykes and volcanic necks of South Gippsland, Victoria. Proc. Roy. Soc. Vic. 47(1) 112-132.

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