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I5 - Yaloak Valley - Basalt Outliers and Dolomite

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 section of the Geological Society of Australia website for details of geological heritage reports, and a bibliography.

Location:Ingliston - 595240 and 596253. Shire of Ballan. Between Yaloak Creek and Parwan Creek, 3 km west northwest of Glenmore.
Image: Sites of Significance Werribee
Yaloak Valley - Basalt Outliers and Dolomite

Access:
Glenmore Road.

Ownership:
Private land.

Site Description:
The site includes two flat-topped circular hills or small mesas 2 km north of The Bluff. The hills are capped with Newer Volcanics lavas, the southernmost being predominantly scoria similar to The Bluff. The southern mesa also has a small deposit of dolomite, or lacustrine origin, that overlies the Newer Volcanics. The dolomite is siliceous, fine grained, white to buff in colour and occurs in hard and soft bands of the dolomite suggests it was chemically precipitated in a small lake which formed in a depression on the basalt surface.

Significance:
The geology (with the exception of the dolomite) and surface of the mesas is similar to that of the tablelands that surround the Parwan Valley, however, the elevation of the surface of the two hills is 100 m lower. Several mechanisms have been proposed to account for this, including faulting, warping and mass movement, but the presence of the dolomite suggests that the original surface on the underlying Tertiary sediments was already lying at a lower level before the eruption of the basalts.


Regional. The dolomite is an uncommon rock in the study area. The twin mesas are an unusual landform and present interesting issues in the study of their origin.

Management:
Class 2. The dolomite deposit should be left intact to allow analysis of its origin in relation to the topography of the mesas.
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