Eumeralla Formation: Lower Cretaceous Volcaniclastic Sedimentary Units in the Otway Basin

Southern Australia's Otway Basin contains the Early Cretaceous Eumeralla Formation, a non-marine volcaniclastic unit deposited during the break-up of eastern Gondwana. The dataset, provided by the Australian Ocean Data Network, describes three major basin-wide lithostratigraphic units and a fourth western unit, interpreted as representing coal swamps, flood plains, and lake environments. Analysis is based on wireline-log data and sedimentary facies studies, linking deposition to Aptian-Albian sea-level changes and intrabasinal volcanism.

Use Cases

• Modeling rift basin depositional environments based on described lithostratigraphic units (Eumeralla I-IV).
• Correlating sedimentary facies with Aptian-Albian sea-level changes as mentioned in the description.
• Analyzing the influence of intrabasinal volcanism on basin drainage and sedimentation patterns.
• Stratigraphic mapping of coal swamps, flood plains, and lake environments in the Otway Basin.

Strengths

• Describes three major basin-wide lithostratigraphic units plus a fourth regional unit, providing a structured framework.
• Interpretations are supported by wireline-log analysis and sedimentary facies analysis of outcropping units.
• Links depositional environment changes to a specific geological time period (Aptian-Albian).

Limitations

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

Provenance

Source

Australian Ocean Data Network

Collection Method

Wireline-log analysis and sedimentary facies analysis of outcrops.

Time Range

Early Cretaceous (Aptian-Albian)

Freshness

Last updated 2026-06-05 06:44:53.773187; freshness should be verified.

Geography

Otway Basin, southern Australia