The Precipice Aquifer & Equivalents - 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 Precipice Aquifer and Equivalents map data

A: Formation Extent

B: Outcrop extent

C: Isopach Raster

D: Isopach Contours

E: Data Point Locations

The 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 datasest 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.

Interpretations by OBrien & Wells, (1994); and O'Brien 2011 were used in generating the isopach data (thickness surface and contours) along the boundary of the Surat and Clarence-Moreton Basins.

Isolated polygons in the North West have represent the extents of a basal Lower Jurassic sandstone underlying the Hutton Sandstone which is equivalent to the Precipice Sandstone,.

This dataset and associated metadata can be obtained from www.ga.gov.au, using catalogue number 81684.

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]

REFERENCES:

References - main data sources

- Department of Primary Industries and Regions SA (2011). Petroleum Exploration and Production System - South Australia (PEPS-SA). Version 2011-06-15. Retrieved from http://www.pir.sa.gov.au/petroleum/access_to_data/peps-sa_database

- Geological Survey of Queensland (2010). Queensland Petroleum Exploration Data (QPED) database. Retrieved 25 September 2011, from http://mines.industry.qld.gov.au/geoscience/geoscience-wireline-log-data.htm.

- Geoscience Australia, 2013. Mesozoic Geology of the Carpentaria and Laura Basins (dataset). Scale 1:6000000. Geoscience Australia, Canberra. [available from www.ga.gov.au using catalogue number 75840]

- Gibson, D. L., B. S. Powell & Smart, J. (1974). Shallow stratigraphic drilling, northern Cape York Peninsula, 1973. Record 1974/76. Australia, Bureau of Mineral Resources.

- Govt. of South Australia (2011). WaterConnect Groundwater database [available at https://www.waterconnect.sa.gov.au].

- Habermehl, M. A. and J. E. Lau (1997). Hydrogeology of the Great Artesian Basin Australia (Map at scale 1:2,500,000). Canberra, Australian Geological Survey Organisation.

- O'Brien, P. E. (2011). The eastern edge of the Great Artesian Basin: relationships between the Surat and Clarence-Moreton basins. Internal report. Canberra, Geoscience Australia.

- Wells, A.T. , O'Brien, P.E. 1994 Lithostratigraphic framework of the Clarence-Moreton Basin IN Wells, A.T. and O'Brien, P.E. (eds.) "Geology and Petroleum Potential of the Clarence-Moreton Basin, New South Wales and Queensland" Australian Geological Survey Organisation. Bulletin 241 p4-47

References - Seismic Surveys

- none

References - Well Completion Reports and drilling logs

- None