The "Geera Clay equivalent": a regressive marine unit in the Renmark Group that sheds new

Geoscience Australia Data provides a geological study of the 'Geera Clay equivalent', a regressive marine unit within the Renmark Group. The document discusses sandy clays deposited during the Oligocene to Middle Miocene transgression in the Murray Basin, their lateral fluvio-lacustrine equivalents, and associated marine dinoflagellate and pollen biostratigraphy. The analysis proposes a correlation for the Late Miocene Mologa weathering surface with a global sequence boundary.

Use Cases

• Correlating regional stratigraphic units based on described dinoflagellate and pollen biostratigraphy.
• Modeling paleo-sea-level changes and regression events in the Murray Basin during the Oligocene-Miocene.
• Dating the Mologa weathering surface by correlating it with the sequence boundaries mentioned in the description.

Strengths

• Includes discussion of three pollen species with potential biostratigraphic value.
• Describes one new pollen species, Tetrapollis campbellbrownii.
• Proposes specific age correlations (13.8 Ma or 10.5 Ma) for a key regional unconformity.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• 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, with discussion of Late Miocene surfaces

Freshness

Last updated 2026-04-30 13:17:12.879880; freshness should be verified.

Geography

Murray Basin