4-11 Basalt outcrops in Condah Swamp at Cloverdale

This information has been developed from the publications:

An assessment of the Geological/Geomorphological Significance of Private Land in the Shire of Portland (1981) by N. Rosengren, J Mallen, T Shepherd.

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.

Locality:	7221-731939. Condah Swamp near the central drain, one kilometre north-east of Cloverdale.
Access:	Myamyn - Macarthur Road.
Geology/Geomorphology:	Several small rounded outcrops of strongly jointed vesicular basalt protrude through the alluvium of the Condah Swamp. The outcrops are approximately 10 metres in diameter and less than one metre high. They are exposed as incomplete domes in which flattened vesicles are oriented parallel to the upper surface of the structure.
Significance:	State. The morphology of these features compares closely with previously described tumuli, and they are therefore considered to be partially buried tumuli of the Harman Valley floor. It is probable that further outcrops of these features occur between Wallacedale and Lake Condah. The existence of these features provides evidence concerning the relative ages of the Harman Valley and Tyrendarra lava flows.
Management:	The features have not been examined in detail and, being low, can be easily obscured. Dumping of spoil from drainage works of the Condah Swamp should be located away from this site.

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