Quaternary Seafloor Geology and Modern Sediments of Van Diemen Rise

Environmental baseline data for the Van Diemen Rise on the Sahul Shelf in the eastern Timor Sea. The dataset describes Quaternary evolution, modern geological processes, and environmental features to inform petroleum exploration activities. It was published by the Australian Ocean Data Network and last updated in April 2026.

Use Cases

• Modeling sediment distribution patterns using features like calcareous sand, foraminiferal calcarenites, silty clays, and molluscan debris.
• Analyzing the impact of past sea-level changes on shelf morphology by studying sinuous channel-like features, terraces, and banks formed during the last glacial maximum.
• Mapping modern benthic habitats using data on assemblages dominated by large foraminifera, coralline algae, and Halimeda on outer shelf banks.
• Assessing sediment transport by correlating clastic sediment input from wet-season rivers within the 50 m contour with current and tidal dispersal patterns.

Strengths

• Focuses on a specific, high-interest region for resource exploration: the Van Diemen Rise in the Timor Sea.
• Provides integrated analysis spanning from the last glacial maximum (~18,000 BP) to modern sedimentation processes.
• Data supports regulatory requirements for environmental baselines before petroleum exploration activities.

Limitations

• Specific quantitative data metrics like row counts, sample sizes, or measurement resolutions are not provided.
• Primary data formats are descriptive reports (HTML, PDF), limiting direct machine-readability for analysis.
• Geographic scope is limited to a single rise feature within the broader Timor Sea.

Provenance

Source

Australian Ocean Data Network

Collection Method

Analysis and interpretation of geological and environmental features, likely from seismic surveys, sediment samples, and bathymetric data.

Time Range

Quaternary period to present, with specific reference to the last glacial maximum (~18,000 years before present).

Freshness

Last updated in April 2026, indicating recent maintenance.

Geography

Van Diemen Rise, Sahul Shelf, eastern Timor Sea.