Eumeralla Formation Lithostratigraphy and Depositional Analysis

Early Cretaceous data from the Otway Basin on Australia's southern margin details the volcaniclastic Eumeralla Formation. The Australian Ocean Data Network provides analysis of four basin-wide lithostratigraphic units and their interpreted depositional environments. The dataset was last updated in April 2026.

Use Cases

• Classify lithostratigraphic units (Eumeralla I-IV) based on described compositions like siltstone, mudstone, sandstone, and coal.
• Model depositional environment transitions from coal swamps and flood plains to freshwater lakes and high-energy stream channels.
• Correlate sedimentary facies and lithology variations with Aptian-Albian sea-level change records.
• Analyze the influence of intrabasinal volcanism on sedimentation patterns and basin drainage system controls.

Strengths

• Analysis defines four distinct lithostratigraphic units with specific compositional descriptions.
• Interpretations are supported by sedimentary facies analysis of outcropping units Eumeralla II and III.

Limitations

• Sample data and quantitative row/column counts are unavailable.
• The dataset is presented in document formats (HTML, PDF), limiting direct computational analysis.
• The bases of the lithostratigraphic units are described as probably diachronous, introducing temporal uncertainty.

Provenance

Source

Australian Ocean Data Network

Collection Method

Wireline-log analysis and sedimentary data interpretation.

Time Range

Early Cretaceous, specifically Aptian to Albian stages.

Freshness

Last updated in April 2026.

Geography

Otway Basin on the southern margin of Australia.