Nature conservation

Threatened species

Robertson Basalt Tall Open-forest in the Sydney Basin and South Eastern Highlands Bioregions - profile

Indicative distribution

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The areas shown in pink and/purple are the sub-regions where the species or community is known or predicted to occur. They may not occur thoughout the sub-region but may be restricted to certain areas. ( click here to see geographic restrictions). The information presented in this map is only indicative and may contain errors and omissions.
Scientific name: Robertson Basalt Tall Open-forest in the Sydney Basin and South Eastern Highlands Bioregions
Conservation status in NSW: Critically Endangered Ecological Community
Commonwealth status: Endangered
Gazetted date: 15 Jun 2001
Profile last updated: 07 Sep 2017


Robertson Basalt Tall Open Forest is an open forest or woodland reaching to 30 m tall with a sparse to moderately dense shrub layer and a dense herbaceous ground layer. Dominant tree species include Brown Barrel Eucalyptus fastigata, Manna Gum E. viminalis, Narrow-leafed Peppermint E. radiata and Mountain Grey Gum E. cypellocarpa. Blackwood Acacia melanoxylon is a common small tree species in this community. Common shrubs include Coprosma quadrifida and Senecio linearifolius. The composition of the community varies across its distribution, largely reflecting a rainfall gradient from east (near the Illawarra Escarpment) to west (near Bundanoon).


Robertson Basalt Tall Open Forest is restricted chiefly to occurrences of Robertson Basalt on the Southern Highlands of NSW but also found on the Cambewarra Range to the south. It is found in the Wingecarribee and Shoalhaven local government areas, but may occur elsewhere in the Sydney Basin Bioregion.

Habitat and ecology

  • Found on highly fertile soils derived from basalt.
  • Found mostly on rolling hills on gentle to steep slopes.
  • Occurs in areas with rainfall between 1000 mm to 1600 mm.
  • Disturbed remnants are considered to form part of the community if the vegetation is likely to respond to assisted natural regeneration.
  • About 400 hectares, or less than 15% of this community's original occurrence has been estimated to remain.
  • Most remnants are small and isolated pockets on private land.

Regional distribution and habitat

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Recovery strategies

Activities to assist this species

Information sources

IBRA Bioregion IBRA Subregion Known or predicted Geographic restrictions region
Sydney BasinBurragorang Known None
Sydney BasinIllawarra Predicted None
Sydney BasinMoss Vale Known None