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14. Jack River Basalt Quarry

This information has been developed from the publications:

  • Sites of Geological and Geomorphological Significance in Central Gippsland (1981) by Neville Rosengren, M.S McRae-Williams and S.M Kraemers,
  • Sites of Geological and Geomorphological Significance on the Coast of Port Phillip Bay and in the Catchment of Westernport Bay (1984, 88) by Neville Rosengren.
  • Sites of Geological and Geomorphological Significance in the South Gippsland Marine and Coastal Parks (1989) 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 (external link) section of the Geological Society of Australia website for details of geological heritage reports, and a bibliography.

Location:595333. 12 kilometres west of Yarram.
Image: West Gippsland Sites of Significance
Columnar jointing in Older Volcanics - Jack River Quarry.

Access:
Boolarra Road.

Ownership:
Private land.

Geology/Geomorphology:
Basic volcanic rocks of the La Trobe Valley Group are widespread in Gippsland, and have been referred to as the Older Volcanics or Older Basalts. Outcrop samples of the Older Basalts of the Carrajung Volcanics of south-east Gippsland obtained from the quarry site at Jack River were dated by the K-Ar method as 55 million years to 57 million years old (Middle to Late Palaeocene).

Significance:
Regional. Prominent flow banding and sagging columnar jointing are observable in the upper part of the quarry face. The quarry site represents one of the best vertical exposures of the flow structures of the Carrajung Volcanics.

Management:
Maintenance of clear exposures in the quarry site would enhance the significance of the site. Although the site gives good exposures of unweathered basalt, the nature of the quarry design (i.e. cut back into the side of a steep hill) has caused large scree deposits at the base of the quarry walls which obscure readily accessible areas within the quarry.

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