The Surface Geology of Australia data package on DVD includes the: <ul><li><a href="https://www.ga.gov.au/products/servlet/controller?event=GEOCAT_DETAILS&catno=70311">Surface Geology of Australia 1:1 million scale dataset 2010 edition</a> </li> <li><a href="https://www.ga.gov.au/products/servlet/controller?event=GEOCAT_DETAILS&catno=70622">Surface Geology of Australia 1:2.5 million scale dataset 2010 edition</a></li> <li> <a href="https://www.ga.gov.au/products/servlet/controller?event=GEOCAT_DETAILS&catno=32366">Geological Regions of Australia (National Geoscience Dataset)</a></li></ul> DVD package of three national geological datasets.

Geoscience Australia has released two web-based map sheets (GeoCat 69347) that show the continental extent and age relationships of Archean mafic and ultramafic rocks and associated mineral deposits throughout Australia. Geoscience Australia Record 2009/41 is a user guide which compiles all the geological and geochronological data that underpins the information portrayed on these two new map sheets. The Archean eon (~4000 million years to 2500 million years) represents an early part of Earth's history that is noteworthy for the occurrence of unusual olivine-rich ultramafic rocks called komatiites which contain world-class deposits of nickel sulphides. Archean mafic and ultramafic igneous rocks with reliable crystallisation ages in Australia are confined to the older crustal components in Western Australia and South Australia. In this study, twenty-six Archean Magmatic Events (AME) ranging in age from the Eoarchean ~3730 Ma (AME 1) to the late Neoarchean ~2520 Ma (AME 26) were identified. This mafic-ultramafic magmatic event series is based on several hundred published age measurements, of which over 95 per cent are derived from recent Uranium-Lead dating of zircon and baddeleyite. The new map sheets, when used in association with the `Australian Proterozoic Mafic-Ultramafic Magmatic Events' map published in 2008 (GeoCat 66114; GA Record 2008/15: GeoCat 66624), summarise the temporal and spatial evolution of Precambrian mafic-ultramafic magmatism in Australia. These maps provide a national framework for investigating under-explored and potentially mineralised environments, and assessing the role of mafic-ultramafic magmatism in the development of the Australian continent. The maps will be of interest to explorers searching for nickel, platinum-group elements, chromium, titanium, vanadium, and cobalt.

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single page item on stratigraphy issues relevant to Australian geologists. This column discusses international discussions on the global stratotype section and point (GSSP) concept, new developments in stratigrphic classification and upcoming opportunities to showcase Australian examples in 2012. Journal ISSN 0312 4711

Part-page item of matters related to stratigraphy. This column discusses informal units, the role of authors and reviewers, and is the 50th Stratigraphic Column produced by the Australian Stratigraphy Commission. Journal ISSN 0312 4711

Biostratigraphy is the branch of stratigraphy that uses fossils to establish relative ages of rock and correlate successions of sedimentary rocks within and between depositional basins. A biozone is an interval of geologic strata characterised by certain fossil taxa. Such intervals are often defined by the first appearances (range bases), apparent extinctions (range tops/last appearances), or abundances of fossil index species. These key index species should be relatively abundant, short-lived taxa that are easy to recognise and as geographically widespread as possible. Widely used fossil groups include brachiopods, conodonts, dinoflagellate cysts, foraminifera, graptolites, nannofossil, spores and pollen and trilobites. Zonal schemes based on several different fossil groups can be used in parallel, and the zones can be calibrated to the absolute geological timescale using tie points to rocks which have been radio-isotopically dated.

Legacy product - no abstract available

No abstract available

The national mineral deposits dataset covers 60 commodities and more than 1050 of Australia's most significant mineral deposits - current and historic mines and undeveloped deposits. This release adds more than 100 new deposits to the previous release of OZMIN plus upgraded resource and production figures.

The Mount Isa dataset provides comprehensive information on 243 of the largest mineral deposits in the Mount Isa region - current and historic mines and undeveloped mineral deposits.