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Forbes (SI55-7) Geology GIS Data Package

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: ANZCW0703002586

Title: Forbes (SI55-7) Geology GIS Data Package


Custodian: Geoscience Australia (GA) and Department of Mineral Resources, New South Wales (DMRNSW)

Jurisdiction: Australia



The Forbes Geology GIS comprises a digital compilation of regional geological mapping of the Forbes 1:250,000 sheet by AGSO and the NSW DMR under the National Geoscience Mapping Accord from 1995 to 1999. The data package includes all mapping data from the 6 component 1:100,000 geological sheets; Parkes, Grenfell, Bogan Gate, Marsden, Condobolin and Wyalong. The GIS includes polygon and line layers depicting outcropping and buried rock types, structures, and regolith landforms. It also includes point layers depicting outcrop descriptions; mineral occurrences; geochemical, thin section and geochronological samples; georeferenced photographs; structural readings; and drill hole locations. Representative images of AGSO's airborne magnetic and radiometric data are also included.

ANZLIC search words:

  • GEOSCIENCES Geology Maps

Spatial domain:

locality map

Geographic extent polygon: 147 -33, 148.5 -33, 148.5 -34, 147 -34, 147 -33,

Geographic bounding box:
North bounding latitude: -33 °
South bounding latitude: -34 °
East bounding longitude: 148.5 °
West bounding longitude: 147 °

Data currency

Beginning date: 1999-05-01

Ending date: 2000-05-01

Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Stored data format:
DIGITAL - ArcGIS-coverage ArcInfo coverage Geographic AGD66
Available format type:
DIGITAL - dat Data file MapInfo Geographic AGD66
DIGITAL - ArcGIS-coverage ArcInfo coverage Geographic GDA94
DIGITAL - shp ArcView shape file ArcView Geographic GDA94

Access constraints:

Licence required.

Free Data Download

Data quality


Geological mapping was compiled through integration of field mapping, aerial photograph interpretation, 400m line spaced airborne geophysics (magnetics and radiometrics), university studies and open file company reports. Mapping was scanned and digitised in Intergraph Microstation and Arc/Info from compilation sheets compiled on to 1:50,000 scale topographic film bases. Preliminary data was released in hardcopy in April 1999. Since then, considerable further editing has been performed in Arc/Info to create the current version. Data was converted to MapInfo and ArcView formats from Arc/Info.

Positional accuracy:

Vector data were compiled on NSW LIC 1:50,000 scale topographic base maps. Most point data was located by non-differential GPS with a typical accuracy of 50-100 metres. Historical point data was located on 1:100,000 and 1:250,000 scale maps with a typical accuracy of 100-500 metres. Digitising accuracy is taken as approximately <1mm (~50 metres on the ground).

Attribute accuracy:

Attribute data for geological layers comply to the AGSO Geoscience Data Dictionary. The lookup table GEOL.LUT provides additional geological polygon attributes.

Logical Consistency:

Data layers fall into three feature groups: polygons + lines, lines + points, points only. All lines, points and polygons in all layers are labelled and fully attributed, EXCEPT in the cross sections which are designed for cartographic display and are not geographically registered. All care has been taken to ensure that all lines intersect at nodes, no duplicate lines exist and all polygons are closed with no duplicate labels. Geological faults exist as dangling lines (overshoots) in polygon layers.


Data and basic descriptive attributes are complete. Some attributes, such as UNITNAME, are not fully populated as some units do not have formal names. An extended geological attribute lookup table (GEOL.LUT) contains additional information about the rock units, but some attributes may not be complete for all rock units.

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:


Authors:Raymond, O.L. Duggan, M. Lyons, P. Scott, M.M. Sherwin, L. Wallace, D.A. Krynen, J.P. Young, G.C. Wyborn, D. Glen, R.A. Percival, I.G. Leys, M.