Great Artesian Basin - Hydroconnectivity at the base of the Great Artesian Basin Thickness and Extent

Brief description

The regional scale hydraulic interconnection across the base of the Great Artesian Basin data categorises the hydraulic nature of the base the GAB, through properties of rocks in direct contact below and above the base of the GAB. It indicates areas of potential connectivity between aquifers in older basins and the aquifers in the GAB sequence. There are two data layers described as; A: Hydrogeological basement units in contact with the base of the Great Artesian Basin - representing a regional interpretation of basement stratigraphic units as hydrostratigraphic units, in contact with the base of the Jurassic-Cretaceous sequence of the GAB B: Base Great Artesian Basin hydrogeological units directly overlying hydrogeological - representing a regional interpretation of the of the Jurassic-Cretaceous stratigraphic units at the base of the GAB, as hydrostratigraphic units. Both represent coverages of hydraulic character, with qualitative categories from Aquiclude, through Tight Aquitard, Leaky Aquitard, to Partial Aquifer and Aquifer. This dataset and associated metadata can be obtained from www.ga.gov.au, using catalogue number 81685. REFERENCES: Ransley, T., Radke, B., Feitz, A., Kellett, J., Owens, R., Bell, J. and Stewart, G., 2015. Hydrogeological Atlas the Great Artesian Basin. Geoscience Australia. Canberra. [available from www.ga.gov.au using catalogue number 79790] Stewart, A.J., Raymond, O.L., Totterdell, J.M., Zhang, W. & Gallagher, R., 2013. Australian Geological Provinces, 2013.01 edition. 2013.01 ed. Scale 1:2500000. Geoscience Australia, Canberra, Australia.

Lineage

Maintenance and Update Frequency: notPlanned

Statement: METHOD: Data layer `A (Hydrogeological basement units in contact with the base of the Great Artesian Basin) is modified from Ransley & Smerdon (2012), Figure 5.8 (12-6563-45), using data from Stewart et.al (2013) and unpublished, revised Arkaringa and Pedirka basin boundaries, supplied by the South Australian Department of Environment, Water and Natural Resources. Data Layer `B (Base Great Artesian Basin hydrogeological units directly overlying hydrogeological) is a composite dataset derived from the following aquifer and aquitard extent layers in the data sources listed below. 1. Paleogene-Neogene (Geocat No. 81675) 2. Winton-Mackunda (Geocat No. 81676) 3. Rolling Downs (Geocat No. 81677) 4. Cadna-owie Hooray (Geocat No. 81678) 5. Westbourne (Geocat No. 81679) 6. Adori-Springbok (Geocat No. 81680) 7. Birkhead-Walloon (Geocat No. 81681) 8. Hutton (Geocat No. 81682) 9. Evergreen-Poolowanna (Geocat No. 81683) 10. Precipice (Geocat No. 81684) The Aquifer and Aquitard extents were combined and the area of contact with the base of the GAB was derived for each formation extent layer; QAQC: Data has undergone a QAQC verification process in order to capture and repair attribute and geometric errors. SOFTWARE: All modifications/edits and geoprocessing were performed using ESRI ArcGIS 10 software.