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1-14 Drik Drik Sinkholes

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:

7121-253908. Four kilometres south of Drik Drik.

Access:

Nelson-Winnap Road.

Geology/Geomorphology:

This site comprises two sinkholes. The northerly sinkhole (DD-2) has a tunnel-like cave of dimensions 20 m (length) x 10 m (height) x 1,3 m (width). The cave broadens to 3 metres wide at the base where there is a small underground stream. The entrance has now collapsed and the cave is difficult to enter. A fault is exposed in the cliff of the southern sinkhole.

Significance:

Regional. Of particular interest at this site is the fault displayed in the southern sinkhole.

Management:

Quarrying and rubbish dumping should be prohibited.

Reference:

Department of Mines, Victoria (1928)
Coulson, A. (1940). 'Caves of the Portland District', Vict. Nat. 57: 37-39.
Matthews (1979)
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