Layer 10 Great Artesian Basin base of Jurassic-Cretaceous sequence surface (Great Artesian Basin Water Resource Assessment)

## **Abstract** 

This dataset and its metadata statement were supplied to the Bioregional Assessment Programme by a third party and are presented here as originally supplied.



Layer 10 Base of Jurassic-Cretaceous sequence surface



Surface produced for the Great Artesian Water Resource Assessment (GABWRA) by Geoscience Australia (http://www.ga.gov.au). This surface was created for 3D visualisation of the Base of Jurassic-Cretaceous sequence.



The surface is available in the following formats

1. GOCAD surface  (.ts)

2. ESRI grid

3. ASCII grid (.grd)



Use limitations: 

1. GOCAD surface requires program capable of reading GOCAD \*.ts (triangulated surface) files

2. ASCII grid data requires re-interpolation by end-user resulting in minor differences to accompanying GOCAD \*.ts surface.



This layer is part of a set comprised of:

Layer 01 3-second Digital Elevation Model surface (catalogue \#75990)

Layer 02 Base of Cenozoic surface (catalogue \#75991)

Layer 03 Base of Mackunda Formation and equivalents surface (catalogue \#76021)

Layer 04 Base of Rolling Downs Group surface (catalogue \#76022)

Layer 05 Base of Hooray Sandstone and equivalents surface (catalogue \#76023)

Layer 06 Base of Injune Creek Group surface (catalogue \#76024)

Layer 07 Base of Hutton Sandstone surface (catalogue \#76025)

Layer 05-07 Base of Algebuckina Sandstone surface (catalogue \#76952)

Layer 08A Base of Evergreen and Marburg formations (catalogue \#76026)

Layer 08B Base of Poolowanna Formation (catalogue \#76953)

Layer 09 Base of Precipice Sandstone and equivalents surface (catalogue \#76027)

Layer 10 Base of Jurassic-Cretaceous sequence surface (catalogue \#76028)



This dataset and associated metadata can be obtained from www.ga.gov.au, using catalogue number 76028.

## **Dataset History** 

SOURCE DATA: 

Stratigraphic point control was provided by borehole stratigraphic picks from QPED (Geological Survey of Queensland, 2010), PIRSA (PIRSA, 2007), GABLOG (Habermehl, 2001), as well as picks by Phil O'Brien (2011) for the Clarence-Moreton Basin. These were used to constrain the existing Senior basement surface (Senior and associates, 1997), extended primarily on seismic interpretation. Because the Senior basement surface included Triassic sequences in the Surat and Eastern Eromanga basins, based on the then-existing Habermehl definition of the GAB, in areas overlying the Galilee and Bowen Basins, the Senior basement surface was replaced by the Senior Top- Moolayember surface (Senior and associates, 1997). With these adjustments, the modified Senior basement surface was accepted for the onshore GAB in Qld and NT. For South Australia, the PIRSA/ Water Commission interpreted surface (PIRSA, 2007) was used as this included latest seismic survey data. In the Carpentaria Basin, for the offshore region, the basement surface was compiled from McConachie & Stainton (1994). McConachie et.al. (1997) was used for the onshore region of the Carpentaria Basin. For the eastern Coonamble Embayment, contour data of Hawke and Cramsie (1989) was used. Elsewhere in NSW to the west, the stratigraphy data of Hinds (2011) was applied.  



BOUNDARIES: 

The surface was clipped to the Assessment boundary (Ransley & Smerdon (Eds) 2012).



PROCESSING: 

For details on data processing, refer to "The three-dimensional visualisation of the Great Artesian Basin: A report to the Australian Government from the CSIRO Great Artesian Basin Water Resource Assessment" Nelson G. et. al 2012



REFERENCES:

See http://www.ga.gov.au/metadata-gateway/metadata/record/gcat_76028

## **Dataset Citation** 

Geoscience Australia (2013) Layer 10 Great Artesian Basin base of Jurassic-Cretaceous sequence surface (Great Artesian Basin Water Resource Assessment). Bioregional Assessment Source Dataset. Viewed 10 December 2018, http://data.bioregionalassessments.gov.au/dataset/11dcfa96-2a3e-402d-b6f2-1e90290842f7.

Tags: Cooper subregion, Galilee subregion, Namoi subregion, geoscientificInformation
Organization: Bioregional Assessment Program