Coastal Quaternary geological maps
In 2005, the Geological Survey of NSW released high-resolution (1:25 000 or better) digital mapping data of the coastal Quaternary deposits of New South Wales (excluding the Greater Sydney region) as part of its contribution to the Comprehensive Coastal Assessment. A series of 1:100 000 and 1:25 000 hard copy map products has now been produced from the digital data for nine areas of the North Coast. The maps are double-sided and show on one side a 1:100 000 overview of the area's Quaternary geology. On the reverse side there are two to four maps of key areas at 1:25 000. A well illustrated set of explanatory notes has now also been published to accompany the maps. The map data represents a vast improvement on hitherto available geological mapping in the coastal lowland areas of New South Wales, due to its greater degree of differentiation of depositional units, and a unique methodology that has enabled the simultaneous mapping of surface and shallow sub-surface sedimentary deposits.
The Quaternary geology was combined with existing 1:250 000 bedrock mapping, and the GIS-based map product was complemented by linked databases, such as the locations of past mineral sands mining, mining and quarrying activity, field sampling data and sediment characteristics. Information contained in the mapping can assist with land-use planning and natural resource management issues, for example, through conversion to predictive maps of geological hazards, land-use capability, or location of extractive resources. A series of four hard copy maps at 1:100 000 and 1:25 000 for the South Coast region is expected to be available in 2009. The report Coastal Quaternary geology - north and south coast of New South Wales is included in Bulletin 34.
To find out more about each map, please click on the link below or the target map sheet on the right.
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