LocalitiesWest Tamar
Type AreaFreshwater Point Road, Legana
Grid Reference41° 21’ 18.30” S; 147° 03’ 16.59” E Elevation 39m ASL
Geology Sheet 1:25 000 Prospect (Forsyth and Calver 2005)
Confidence LevelHigh
Land Salinity
moderate
Salt Export
moderate
Water Salinity
moderate

Summary

The Legana Hydrogeological Landscape (HGL) is characterised by low hills and terraced rises forming a peninsula, with bedrock exposed in localised cliff sections. This HGL underlies Legana township, north of Launceston. This is an area of moderate rainfall (680 mm). It has preserved regolith and alluvial sediments forming dissected plains and terraces overlying deeply weathered bedded sedimentary rocks. Low-lying areas are influenced by the Tamar Estuary.

Typical lithologies for this HGL are poorly to semi-consolidated interbedded gravel, sand, silt and clay overlying sedimentary rocks. The landscape consists of low hills and rises with moderately to gently inclined slopes (<15°), forming an undulating landscape along the centre of the peninsula, with localised relatively flat surfaces dissected by streams. Low-lying areas are characterised by fluvial (and tidal) terraces of the Tamar Estuary.

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