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The development of the continental shelf of northern New South Wales

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Created 20/01/2025

Updated 20/01/2025

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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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Title The development of the continental shelf of northern New South Wales
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/f6922e73-3641-4928-8c45-f1be9523d385
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage {"type": "Polygon", "coordinates": [[[152.4, -32.0], [154.0, -32.0], [154.0, -28.0], [152.4, -28.0], [152.4, -32.0]]]}
Data Portal data.gov.au