The dataset from the Australian Ocean Data Network details stratigraphy and sedimentology of mid-Tertiary permeability barriers in the Murray Basin subsurface. It includes analysis of borelogs, facies, and paleogeographic reconstructions, focusing on formations like the Ettrick Formation, Winnambool Formation, and Geera Clay. The data was last updated on 2026-04-16.
Use Cases
- Model groundwater flow disruption based on the described arcuate low-permeability barrier.
- Analyze aquifer geometry and permeability relationships based on stratigraphic unit distributions.
- Estimate effective porosity for subsurface barriers based on the 0-7% porosity range reported for the Geera Clay.
- Reconstruct paleogeographic marine incursions based on borelog facies analysis.
- Assess subsurface barrier composition based on the described percentages of clay, silt, sand, and mud.
Strengths
- Includes specific porosity measurements (0-7%) for the Geera Clay from a cored borehole section.
- Describes stratigraphic unit thicknesses, such as the Ettrick Formation (10-30 m) and Murray Group limestone (>100 m).
- Provides compositional percentages for the Geera Clay (6% clay, 65% silt, 15% sand, 14% mud).
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 bias inherent to data_gov_au, focusing solely on the Murray Basin.
Provenance
- Source
- Australian Ocean Data Network
- Collection Method
- Subsurface facies analysis of borelogs and paleogeographic reconstructions.
- Time Range
- Mid-Tertiary (Oligocene-Miocene), with specific events dated to about 32 Ma ago.
- Freshness
- Last updated 2026-04-16 15:59:05.708125; freshness should be verified.
- Geography
- Murray Basin, southeastern Australia, with focus on southwest, west central, and central west areas.