Nannofossil and planktic foraminiferal biostratigraphy around the Oligocene-Miocene bounda

A research study analyzing nannofossil and planktic foraminiferal evidence to delineate the Oligocene-Miocene boundary in the Indo-Pacific region. The dataset, hosted by the Australian Ocean Data Network, was last updated in May 2026. It discusses biostratigraphic events like the appearances of Globigerinoides quadrilobatus primordius and Sphenolithus species across shallow and deep marine sediments.

Use Cases

• Refining biostratigraphic zonation (e.g., combining Zones N.3 and N.4) based on the lowest occurrence of Globigerinoides quadrilobatus primordius.
• Investigating bathymetric influences on fossil first appearances by comparing evidence from marginal-marine and deep oceanic sediments.
• Defining a buffer zone for the Oligocene-Miocene transition using the extinction datum of Sphenolithus ciperoensis and the base of Sphenolithus belemnos.
• Correlating stratigraphic sections across the Indo-Pacific region using co-occurrences of late Oligocene nannofossil and foraminiferal species.

Strengths

• Focuses on a specific and complex geological boundary problem, providing targeted analysis.
• Compares evidence from multiple sediment types (shallow marginal-marine and deep oceanic) and sections within the Indo-Pacific region.
• Cites specific fossil species and events, such as Globigerinoides quadrilobatus primordius and Sphenolithus ciperoensis.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic/temporal bias inherent to the studied Indo-Pacific sections and literature review.

Provenance

Source

Australian Ocean Data Network

Collection Method

Likely contains research findings from the analysis of marine sediment sections and a review of published literature.

Time Range

Focuses on the late Oligocene to early Miocene geological period.

Freshness

Last updated 2026-05 04 23:23:17.219196; freshness should be verified.

Geography

Indo-Pacific region, with specific mentions of marginal-marine sections.