The Murray Basin in southeastern Australia contains subsurface permeability barriers affecting groundwater flow. The dataset likely contains stratigraphic and sedimentological analyses from borelogs, including porosity estimates for the Geera Clay formation. It was published by Geoscience Australia Data and last updated on 2026-04-30.
Use Cases
- Modeling groundwater flow disruption based on the described arcuate low-permeability barrier formed by the Winnambool Formation and Geera Clay.
- Analyzing aquifer geometry and confining layers based on the stratigraphy of the Ettrick Formation and Murray Group limestone.
- Estimating historical porosity changes based on the described mesoscopic porosity range (5-10% original to 0-7% effective) for the Geera Clay.
- Reconstructing paleogeography based on the described three separate Cainozoic marine incursions into the basin.
Strengths
- Includes specific porosity estimates (0-7% effective, 5-10% original) for the Geera Clay from a fully cored borehole section.
- Describes detailed stratigraphic units (e.g., Ettrick Formation, Murray Group limestone) with thickness ranges (10-30 m, >100 m).
- Provides a temporal framework for marine incursions, noting one event commenced about 32 million years ago and lasted at least 20 million years.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count is unknown, which may limit suitability assessment.
- Data is provided as PDF/HTML documents, which may require extraction for computational analysis.
Provenance
- Source
- Geoscience Australia Data
- Collection Method
- Subsurface facies analysis of borelogs and palaeogeographic reconstructions.
- Time Range
- Mid-Tertiary (Oligocene to Miocene), with specific events dated to about 32 million years ago.
- Freshness
- Last updated 2026-04-30 14:24:13.268413; freshness should be verified.
- Geography
- Subsurface of the Murray Basin, southeastern Australia, with focus on west-central areas.