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5-14 Quarry exposure of Bridgewater Formation, South of Portland

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:

7221-518511. Four kilometres south of Portland.

Access:

Minor road off Cape Nelson Road.

Geology:

This quarry provides clear exposures of cross-bedded dune calcarenites and pink, red and yellow-grey fossil soil horizons of the Bridgewater Formation. In places the fossils have infilled hollows in the dune calcarenite. The Bridgewater Formation is overlain by approximately 1 m of grey/white siliceous sand (Malanganee Sand).

Significance:

State. This site is one of the best exposures of the Bridgewater Formation in the study area. Of particular interest are the soil pipes and the well-preserved fossil soil horizons contains in the sands, which are of major significance for correlative studies of phases of Pleistocene dune formation in Victoria. At the base of the north-eastern quarry face is a layer of bedded but unconsolidated sand which is not typical of the Bridgewater Formation.

Management:

It is recommended that the north-eastern and southern quarry faces should be retained as clear exposures and should not be obscured by backfill or dumping of overburden material.

Reference:

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