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

Sandy clays deposited during the waning phase of the Oligocene-Middle Miocene transgression in the Murray Basin. The data includes descriptions of three pollen species of potential biostratigraphic value and one newly described species, Tetrapollis campbellbrownii. It is hosted by the Australian Ocean Data Network and was last updated in June 2026.

Use Cases

• Correlating marine and fluvio-lacustrine sediment units based on the lateral grading of the 'Geera Clay equivalent'
• Dating regional unconformities and weathering surfaces based on marine dinoflagellate extinction events
• Refining biostratigraphic zonations for the Murray Basin using the illustrated pollen species
• Testing sequence stratigraphic models by correlating the Mologa surface with global sequence boundaries

Strengths

• Focuses on a specific geological unit ('Geera Clay equivalent') with a defined temporal context (Oligocene-Middle Miocene)
• Includes taxonomic description of a new pollen species, Tetrapollis campbellbrownii
• Links local stratigraphy to global sea-level events (13.8 Ma and 10.5 Ma sequence boundaries)

Limitations

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

Provenance

Source

Australian Ocean Data Network

Collection Method

Likely contains geological observations, fossil identifications, and stratigraphic interpretations from scientific research.

Time Range

Oligocene to Middle Miocene, with discussion of Late Miocene surfaces.

Freshness

Last updated 2026-06-05 06:20:49.804734; freshness should be verified

Geography

Murray Basin, Australia.