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The development of the continental shelf of northern New South Wales

Created 16/10/2025

Updated 16/10/2025

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Shallow seismic reflection profiling on the continental shelf of northern New South Wales shows a lens of sediments which thickens beneath the mid-shelf, but usually thins beneath the outer shelf and upper slope. The sediments were deposited on a prominent bedrock surface. The bedrock surface sharply increases its gradient, usually beneath the present shelf break, and it is considered to represent the break-up unconformity of the western margin of the Tasman Basin. Within the sediment sequence a prominent unconformity separates a lower sequence of foreset and gently inclined beds from an upper sequence that is generally conformable with the unconformity and the present-day sea floor. Offshore from substantial rivers a deltaic sequence with high-angle foreset bedding was deposited, while elsewhere sub-horizontal, even-bedded sediments were laid down upon a subsiding basement. However, the steep slope of the bedrock surface beneath the present continental slope has prevented any significant outbuilding of the continental shelf.

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Additional Info

Field Value
Title The development of the continental shelf of northern New South Wales
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/1dcdde90-02d2-4c36-8578-51fb7e11f040
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        152.4,
        -32.0
      ],
      [
        154.0,
        -32.0
      ],
      [
        154.0,
        -28.0
      ],
      [
        152.4,
        -28.0
      ],
      [
        152.4,
        -32.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "The development of the continental shelf of northern New South Wales". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/the-development-of-the-continental-shelf-of-northern-new-south-wales