part page item on matters related to stratigraphy. This column discusses: the ratification of the definition of the Quaternary time period; the value of type sections; and the dropping of the name Kulyong Formation

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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.

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.

part-page item on matters related to stratigraphy. This column discusses a definition of the 'year' and the use of Beds vs beds in describing Australian lithostratgraphic units. Journal ISSN 0312 4711

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This record contains descriptions, interpretations and all of the measured sections and drillholes logged during the NABRE project research between 1995 and 1998. New subdivisions of the successions and correlations with similar aged rocks in the Lawn Hill and Mt Isa regions are presented.

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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.