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11. "Mt Speed" Quarry - Trafalgar

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:262674. Three kilometres south of Trafalgar.
Image: West Gippsland Sites of Significance
Fault (dotted), cutting steeply dipping Mesozoic sediments - "Mt Speed" quarry, trafalgar.

Access:
Trafalgar-Thorpdale Road.

Ownership:
Private Land.

Geology/Geomorphology:
This large quarry displays a major exposure of the Lower Cretaceous sedimentary rocks that comprise the South Gippsland Hills. The rocks are a thick sequence of dipping mudstone and sandstone, the latter containing an unusually high silica content in the cement, thus rendering them tougher than most South Gippsland Mesozoic rocks. A fault is exposed with associated brecciated sediments. Several horizons contain abundant plant remains – notably large stems and fragmented leaf materials.

Significance:
State. The highly siliceous Cretaceous rocks are unusual in South Gippsland. The exposure of the fault and the abundant fossil remains are of particular interest.

Management:
Most of the quarry faces are not in use and hence provide the exposures as noted above. Further working of the quarry should provide for the maintenance of the faces that contain the fossil horizons. There is a need for a detailed study of the fossil strata.


Image: West Gippsland Sites of Significance
Stem casts and moulds in Mesozoic sandstone - "Mt Speed" quarry, Trafalgar.
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