Geera Clay Equivalent: Oligocene-Middle Miocene Marine Sediments in the Murray Basin

The Murray Basin in Australia contains sandy clays deposited during the waning phase of an Oligocene-Middle Miocene marine transgression. This dataset, sourced from the Australian Ocean Data Network, includes a PDF/HTML document discussing the "Geera Clay equivalent" unit and its correlation with the Mologa weathering surface, proposing an age correlation with sequence boundaries at 13.8 or 10.5 million years ago. It also illustrates three pollen species and describes one new species, Tetrapollis campbellbrownii.

Use Cases

• Correlating regional stratigraphic units based on marine dinoflagellate extinction events mentioned in the description.
• Dating unconformities and weathering surfaces like the Mologa surface based on proposed correlations with global sea-level sequences.
• Studying paleoenvironmental changes from marine to fluvio-lacustrine settings as indicated by the lateral sediment grading described.
• Conducting biostratigraphic analysis using the illustrated pollen species and the newly described Tetrapollis campbellbrownii.

Strengths

• Focuses on a specific geological unit ("Geera Clay equivalent") with a proposed age correlation to 13.8 or 10.5 million years ago.
• Includes discussion of biostratigraphic markers, including marine dinoflagellates and three pollen species.
• Documentation describes a newly identified fossil species, Tetrapollis campbellbrownii.

Limitations

• Row count is unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.
• Data is presented as PDF/HTML documents, which may require manual extraction for computational analysis.

Provenance

Source

Australian Ocean Data Network via data_gov_au

Collection Method

Likely contains geological research and analysis from scientific publication.

Time Range

Oligocene to Middle Miocene geological period.

Freshness

Last updated 2026-04-28 15:14:16.465551; freshness should be verified.

Geography

Murray Basin, Australia.