Great Artesian Basin - Rolling Downs Aquitard - Thickness and Extent

The Rolling Downs Aquitard - Thickness and Extent data set, is one of a set that represents the hydrostratigraphic units of the Great Artesian Basin, which include five major aquifers, four intervening aquitards, and the Cenozoic cover to the GAB.There are five layers in the Rolling Downs Aquitard map data.A: Formation ExtentB: Outcrop extentC: Isopach RasterD: Isopach ContoursE: Data Point LocationsThe datasets have been derived from the lithostratigraphic intercepts in drillhole data from petroleum exploration wells, water bores, and stratigraphic wells. Seismic correlation and assessment of hydrogeological character based on electrofacies have not been used. The working datasets for this study has been derived primarily from the following databases:1. PEPS-SA (Petroleum Exploration and Production System - South Australia) (Department of Primary Industries and Regions SA, 2011)2. WaterConnect Groundwater database (Govt. of SA, 2011)3. QPED (Queensland Petroleum exploration database) (Geological Survey of Queensland, 2010).4. GABLOG (Great Artesian Basin Well Log Dataset) (Habermehl, 2001)5. Additional supplementary information was derived from published reports listed in the following section.This is a regional interpretation for mapping at approximately 1:1 000 000 to produce a broad scale overview, and examination of small areas by collecting extra data is most likely to produce results that differ from this regional interpretation.This dataset and associated metadata can be obtained from www.ga.gov.au, using catalogue number 81677.Associated report reference: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]