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Geochronology data for the Northern Australian Project

Note: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2.

Dataset citation

ANZLIC unique identifier: ANZCW0703004622

Title: Geochronology data for the Northern Australian Project


Custodian: Geoscience Australia

Jurisdiction: Australia



This dataset has been compiled from Geoscience Australia's OZCHRON, and OZROCKS (SITES and ROCKS) Oracle databases to produce digital data using ESRI ArcInfo, Arcview and MapInfo software. The themes produced so far are from the conventional U-Pb, Rb-Sr and Sm-Nd geochronology methods, and reflect data entry up until Feb 13, 2002 in the Oracle databases. This point data is presented as ArcView shape files and MapInfo tables in a format which should assist with interpretation of the geochronology results. The Northern Australian Project is a joint National Geoscience Agreement project conducted between the Northern Territory Geological Survey and Geoscience Australia to further understanding of the geology and mineral systems of the Northern Australia Craton in order to facilitate mineral exploration in this region.

ANZLIC search words:

  • GEOSCIENCES Geophysics Surveys

Spatial domain:

locality map

Geographic extent name: AUSTRALIA EXCLUDING EXTERNAL TERRITORIES - AUS - Australia - Australia

Geographic extent polygon: 127.5 -18, 138 -18, 138 -24, 127.5 -24, 127.5 -18,

Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register

Geographic bounding box:
North bounding latitude: -18 °
South bounding latitude: -24 °
East bounding longitude: 138 °
West bounding longitude: 127.5 °

Data currency

Beginning date: Not Known

Ending date: 2002-02-13

Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Stored data format:
DIGITAL - dat Data file MapInfo Geographic GDA94
DIGITAL - shp ArcView shape file ArcView Geographic GDA94
DIGITAL - ArcGIS-coverage ArcInfo coverage Geographic GDA94

Access constraints:

Data free if downloaded over the WWW. Licence applies.

Order Product

Data quality


Data stored in Geoscience Australia's geochronology (OZCHRON), and OZROCKS (SITES and ROCKS) Oracle databases were extracted and converted to GIS layers using in-house ArcInfo scripts. The coverages conform to specifications stated in the Geoscience Australia Data Dictionary for GIS products, version 2002.02 ( A thorough visual check of the data has been done in ArcView by overlaying the geochronology points on attributed geological polygon digital data. Checks were done to see that unitnames from the ROCKS table and the geology theme(s) correspond, and the point falls within or close to the polygon as described. An intra-method check was also done (a sample may have been assessed by more than one geochronology method) or be in the same general vicinity as other samples with the same descriptions from the ROCKS table. ESRI shape files and MapInfo files were then created from the ArcInfo data.

Positional accuracy:

This varies from point to point, as described in the Oracle SITES table. The majority of points appear to have a described accuracy somewhere between 25 metres and 300 metres, with the mean about 100 metres. Some points may be more inaccurate.

Attribute accuracy:

Every effort has been made by the original authors/generators of the Oracle reports to make sure that this data has been attributed correctly. It is very difficult for any compiler without specialist or local knowledge to assess the quality of these reports.

Logical Consistency:

Basic quality assurance procedures are built into the Oracle forms as geochronologists or other authors enter the data into the various tables required. A high degree of consistency is therefore placed on the data.


The data is complete up until February 13, 2002. Alternative interpretations of the data in the future are allowed by the same, or different, authors. Further releases are planned.

Contact information

Contact organisation: Commonwealth of Australia (Geoscience Australia) (GA)
Contact position: Manager Client Services
Mail address: Cnr Jerrabomberra Ave and Hindmarsh Dr
Mail address: GPO Box 378
Locality: Canberra
State: ACT
Country: Australia
Postcode: 2601
Telephone: 02 6249 9966
Facsimile: 02 6249 9960
Electronic mail address:

Metadata information

Metadata date: 2013-03-08

Additional metadata

Metadata reference XHTML:

Metadata reference XML:

More metadata regarding the data and conditions of use is contained in a readme.txt file which is included in the downloadable archive. Brief table definitions for each geochronology method are also included in this document. For full descriptions of the OZCHRON, SITES and ROCKS tables, the user should consult the current Geoscience Australia Data Dictionary, which can be located on the Internet at

data dictionary .

Authors:Larson, R.A. (compilation)