LocalitiesMeander Valley; Launceston City; West Tamar
Type AreaTrevallyn Park, Trevallyn
Grid Reference41° 26’ 11.51” S; 147° 06’ 50.64” E; Elevation 94m ASL
Geology Sheet 1:25 000 Prospect (Forsyth and Calver 2005)
Confidence LevelHigh
Land Salinity
Salt Export
Water Salinity


The Trevallyn Hydrogeological Landscape (HGL) is characterised by a partially forested, undulating upland bounded by convex steep to precipitous cliff faces of jointed and fractured dolerite rock. The HGL is located west of the Tamar River in Launceston. This is an area of moderate rainfall (680 mm). it forms an upfaulted block in the landscape and so retains a deeply weathered profile on the upper surface, but is surrounded by cliffs with exposed dolerite.

Typical lithologies for this HGL are deeply weathered Jurassic dolerite and fractured Jurassic dolerite.

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