A weathering intensity index (WII) over the Australian continent has been developed at a 100 m resolution using regression models based on airborne gamma-ray spectrometry imagery and the Shuttle Radar Topography Mission (SRTM) elevation data. Airborne gamma-ray spectrometry measures the concentration of three radioelements - potassium (K), thorium (Th) and uranium (U) at the Earth's surface. The total gamma-ray -ux (dose) is also calculated based on the weighted additions of the three radioelements. Regolith accounts for over 85% of the Australian land area and has a major in-uence in determining the composition of surface materials and in controlling hydrological and geomorphological processes. The application of a stepwise forward multiple regression for the second model generated a weathering intensity index equation of: WII = 6.751 + ? 0.851 - K+ ? 1.319 ? Relief + 2.682 - Th/K + ? 2.590 - Dose. The WII has been developed for erosional landscapes but also has the potential to inform on deposition processes and materials. Interpretation of the WII from regional to local scales and its application in providing more reliable and spatially explicit information on regolith properties are described.

The Northern Australian Project online GIS, which has been chiefly designed to highlight the results of geochronological research within the project area, was first published in 2003 and updated in July 2004. GIS data reference layers include 1: 250,000, 1: 1 million, and 1: 2,500,000 geological data, regional geophysical images and a topographic map image. The geochronology and fluid inclusion points have been linked live to Geoscience Australia's OZROCKS, OZCHRON and PETROG Oracle databases. Forms display data to the user from these databases using customised query statements. Queries directed to geological layers display information derived from static ArcInfo shapefiles. The North Australia Project geochronology research has chiefly targeted the Arunta Block, Davenport Geosyncline, and the Granites-Tanami Block provinces within the project area.

The Geology of Australia dataset documents the distribution and age of major stratigraphic, intrusive and medium to high-grade metamorphic rock units of onshore Australia. It is an ongoing compilation, subject to periodic revision as additional data becomes available. The dataset was compiled to use at scales between 1:2,500,000 and 1:5,000,000 inclusive. The units distinguished/mapped mainly represent stratigraphic supergroups, regional intrusive associations and regional metamorphic complexes. Groupings of Precambrian units in the time-space diagram are generally separated by major time breaks; Phanerozoic units are grouped according to stratigraphic age i.e. System/Period. The time-space diagram has the added benefit that it provides a summary of units currently included on the themes. The method used to distinguish sedimentary and many volcanic units varies for each geological eon as follows: * Cainozoic units are morphological units which emphasise the relationship of the sedimentary fill to the landscape; * Mesozoic units are regionally extensive to continent-wide time-rock units which emphasise the System of Period(s); * Palaeozoic units are stratotectonic units that emphasise either the dominant System or Period(s) or the range of Periods; * Proterozoic units are commonly regional stratotectonic units - separated by major time breaks and split into the Palaeoproterozoic, Mesoproterozoic and Neoproterozoic Eras - which are generally unique to each cratonic region; and * Archaean units are regional lithological units grouped into broad time divisions. Metamorphic units are lithological units which emphasise the metamorphic facies and timing of the last major metamorphic event. Igneous units are regional units which emphasise the dominant lithology and are grouped into broad time divisions. Note: This is a specialist product and most items in the data set do not comply with the current AGSO GIS standards for digital data

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Total magnetic intensity stitch of all open file airborne geophysical surveys at 250 m cellsize for Western Australia. To be released at ASEG, Perth, March 2000.

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The RadWaste Reporting Tool allows Dept of Industry and GHD staff to analyse and compare Multi Criteria Analysis (MCA) ratings of a site within a nominated location and ascertain the reason for the ranking and score. This tool also outputs a snapshot of the nominated site, giving a context map and scores against requirement criteria.

Northern Territory Stratigraphy map 1:2.5m

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