Northeast Pilbara geological digital data. Digital geology of Marble Bar, Port Hedland, Nullagine and Yarrie

These data are a digital representation of information depicted on printed maps from the Australia 1:250, 000 Geological Series produced by AGSO and the Geological Survey of Western Australia (GSWA) between 1972 and 1982. The data are gridded according to the standard Australian 1:250, 000 sheet breakup. The complete dataset is comprised of the 4 1:250, 000 sheets covering marble Bar, Nullagine, Yarrie and Port Hedland in Western Australia.Data present include geological polygons (stratigraphic units), linear structural features (faults,dykes, folds, trends, lineaments etc). Polygons have a range of attributes extracted from each individual map including unit name, age and lithology, while lines and points are feature coded according to the AGSO publication Symbols Used On Geological Maps' (BMR 1989). A standard look-up table of AGSO geological codes and descriptions is available. Pilbara Data has gradually evolved from elementary 'CAD' quality data into its present topologically structured GIS format, and hence has many imperfections and inconsistencies. The spatial accuracy of data from some older maps is particularly problematical. Data has undergone only moderate checking. These map sheets were originally compiled on poor topographic bases. For a more accurate coverage of geology, use the adjusted digital version.