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4-14 Darlot Creek Crossover - Tyrendarra lava flow

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:

7221-673771. One kilometre west of Elengowan.

Access:

Woolsthorpe-Heywood Road.

Geology/Geomorphology:

Near the bridge on the Woolsthorpe-Heywood Road, Darlot Creek crosses an area of low relief on the Tyrendarra flow to become a lateral stream on the eastern side. North of the bridge the stream is lateral on the western side of the flow. At the point of crossover the basalt is largely covered by alluvium, deposited partly by ponding of the creek and partly from minor tributary streams. Several former channels of Darlot Creek are visible on the lava surface parallel to the present stream course.

The vegetation developed on the alluvium includes sedges and rushes. The dead material from these species forms a thick, spongy, peaty material and is covered by herbaceous plants, especially Asperula subsimplex. The vegetation-geomorphology interaction thus provides an unusual land surface.

Significance:

State. This is a classic example of lateral stream development and forms a major site to display the interaction of the Tyrendarra lava flow with the pre- and post-basaltic drainage systems. The site displays clearly the subsequent adjustments of the drainage regime to the emplacement of the lava flow.

Management:

Damming, diversion, or drainage of Darlot Creek will destroy the essential characteristics of the site and any land use leading to such disturbance should be prohibited.

Reference:Boutakoff, N. (1963). The Geology and Geomorphology of the Portland Area. Geological Survey of Victoria, Memoir No. 22.
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