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K3 Organ Pipes National Park

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.

LocationKeilor - 035290. Shires of Melton and Bulla. Valley of Jacksons Creek 9 km northwest of Keilor.

K3 - Silurian sediments (S) underlying Newer Volcanics (V), Jacksons Creek Valley, Organ Pipes National Park.

AccessOrgan Pipes Road off Calder Highway.
OwnershipCrown land (National Park)
Site Description(A brief statement only is given as there is ample material available from the managing authority of the site - the National Parks Service.)
The valley of Jacksons Creek exposes steeply dipping fossiliferous Silurian sedimentary rocks overlain by flows of Newer Volcanics basalt. Structural features such as bedding and jointing are clearly displayed at several localities as is the contact between the formations. Erosional and depositional features of the valley (both relict and active) are also evident.
State. The site is an excellent example of structure of the Silurian sediments and the Newer Volcanics and of the burial of a former landscape lave flows. It provides a clear display of the processes of valley incision by the major tributary of the Maribyrnong River.


Class 1. Continued application of current management principles by the National Parks Service is adequate to maintain the qualities of the site.

Map K3

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