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

The Eumeralla Formation is an Early Cretaceous non-marine volcaniclastic unit from the Otway Basin in southern Australia, 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 various coal swamps, flood plains, lakes, and stream environments. Analysis is based on wireline-log data and sedimentary facies studies, correlating depositional changes with Aptian-Albian sea-level fluctuations.

Use Cases

• Stratigraphic correlation and basin analysis based on the described lithostratigraphic units (Eumeralla I-IV).
• Reconstructing paleoenvironments and drainage system evolution based on interpretations of coal swamps, flood plains, and lakes.
• Analyzing the influence of intrabasinal volcanism on sedimentation patterns and basin drainage controls.

Strengths

• Describes four distinct lithostratigraphic units with specific compositions (e.g., Eumeralla I: siltstone/mudstone/sandstone/coal).
• Interpretations are supported by wireline-log analysis and sedimentary facies analysis of outcropping units.
• Analysis correlates lithological variations with Aptian-Albian sea-level changes, providing a temporal framework.

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 2026-04 28 13:10:44.716327; freshness should be verified.

Geography

Otway Basin, southern Australia