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B1 Somerton Road - Bulla Granodiorite

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.

LocationBroadmeadows - 165323; Shire of Bulla. Small valley tributary to Yuroke Creek on northern side of Somerton Road east of Greenvale Reservoir.

B1 - Bulla Granodiorite.

Access
Somerton Road.

Ownership
Private land.

Site Description
The valley slopes of this small creek display outcrops of contrasting geology. On the western valley slope is an exposure of the Bulla Granodiorite similar to that at Gellibrand Hill. Inclusions (xenoliths) in the granite are evident on a number of fresh rock surfaces in a small disused quarry.

A number of the minor landforms typical of granites eg - small boulders (tors), domed outcrops, and gently sloping rock pavements occur. Outcrop is concealed on the valley floor by alluvium while higher on the eastern valley slope are basalt lava flows from Mt Yuroke.

Significance
Local. The site displays two common rock types of greatly different ages. Although the contact is concealed by alluvial land and colluvial deposits, there is sufficient outcrop for a useful interpretation exercise to be developed.

Management
Class 3. Hard rubbish is being dumped in the disused quarry and should be cleared to improve site quality. Use of the site for a variety of open space purposes eg - parkland, replanting, agistment would retain the significant features.

References
Geological Survey of Victoria (1863), Sunbury 1:63,360 geological map.
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