Geera Clay Equivalent: Oligocene-Middle Miocene Marine Sediment Data from 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, informally named the 'Geera Clay equivalent', preserves marine dinoflagellates extinct by the middle to late Middle Miocene and includes descriptions of pollen species. It was published by Geoscience Australia Data and last updated on 2026-05-14.

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 using sequence boundaries
• Studying the transition from marine to fluvio-lacustrine environments in the Renmark Group
• Analyzing pollen species for biostratigraphic value in the Murray Basin

Strengths

• Includes fossil data (marine dinoflagellates) with specific extinction timing constraints
• Links sediment units to global sequence boundaries (13.8 Ma and 10.5 Ma)
• Describes a new pollen species (Tetrapollis campbellbrownii)

Limitations

• Column-level documentation is absent; field semantics must be inferred after download
• Row count is unknown, which may limit suitability assessment

Provenance

Source

Geoscience Australia Data

Time Range

Oligocene to Middle Miocene

Freshness

Last updated 2026-05-14 03:48:39.876491; freshness should be verified

Geography

Murray Basin, Australia