This map is part of a series which comprises 50 maps which covers the whole of Australia at a scale of 1:1 000 000 (1cm on a map represents 10km on the ground). Each standard map covers an area of 6 degrees longitude by 4 degrees latitude or about 590 kilometres east to west and about 440 kilometres from north to south. These maps depict natural and constructed features including transport infrastructure (roads, railway airports), hydrography, contours, hypsometric and bathymetric layers, localities and some administrative boundaries, making this a useful general reference map.

This USB has been produced for promotional purposes and will be handed out (free) at domestic and international conferences. The USB contains a selection of GA reports, flyers, maps and data. Products are grouped into 4 categories: Records and Brochures, Mineral Deposits, Geophysical Data and Surface Geology.

TBC

Identifying potential leakage zones and recharge pathways is critical to constraining models of surface-groundwater interaction in many floodplain environments in semi-arid landscapes. In this study, a 300 KHz Multibeam sonar was used to map river bed morphology along a losing reach of the Darling River near Menidee in an area known to contain deeper `holes' in the river bed. The survey has shown that the river bed had a strong bar and riffle morphology, with deeper scoured reaches alternating with shallow reaches marked by oblique linear to parabolic sand bars. Sharp bends were often marked with large depressions ranging from 5 to 11 m deep. These features, locally termed `cod holes' due to their importance in providing a reliable water source and refuge for aquatic species in times of drought, are 10-40 m wide and 50 -120 m long. Tree debris is absent from these deep depressions, which when sampled in a number of locations are lined with a hard clay. Their location at sharp bends indicates that they most likely formed and kept open by river scour. The high resolution of these data has enabled construction of detailed hydrogeological cross-sections that, when combined with hydrograph analysis hydrogeochemical and geophysical data, has helped constrain models of surface-groundwater interaction. These data have also assisted in assessing the connectivity between the river and the deeper semi-confined aquifer, and assisted with assessing the potential impacts on the river of managed aquifer recharge options in the area.

Geoscience Australia has recently completed a survey searching for evidence of natural hydrocarbon seepage in the offshore northern Perth Basin, off Western Australia. The survey formed part of a regional assessment of the basin's petroleum prospectivity in support of ~17,000 sq km of frontier exploration acreage release in the region in 2011. Multibeam bathymetry, sub-bottom profiler, sidescan sonar and echosounder data were acquired to map seafloor and water column features and characterise the shallow sub-surface sediments. A remotely operated vehicle (ROV) was used to observe and record evidence of seepage on the seafloor. 71 sediment grabs and 28 gravity cores were collected and are currently being analysed for headspace gas, high molecular weight biomarkers and infaunal content. Survey data identified an area of high 'seepage' potential in the northernmost part of the study area. Recent fault reactivation and amplitude anomalies in the shallow strata correlate with raised, high-backscatter regions and pockmarks on the seafloor. A series of hydroacoustic flares identified with the sidescan sonar may represent gas bubbles rising through the water column. The ROV underwater video footage identified a dark-coloured fluid in 500 metres water depth proximal to the sidescan flares which may be oil that naturally seeped from the seafloor. The integration of the datasets acquired during the marine survey is indicative of natural oil seepage and provides additional support for the presence of an active petroleum system on this part of the continental margin.

Maritime Delimitation under Article 1 of the Agreement on Maritime Delimitation between the Government of Australia and the Government of the French Republic (1982) Diagram AU/FR-02 Refer to GeoCat 65634 Treaty text and coordinates can be found at: http://www.austlii.edu.au/au/other/dfat/treaties/1983/3.html

This report outlines the high precision level survey completed between the SEAFRAME tide gauge and continuous GPS station in Tarawa, Kiribati from 14 - 21 September 2010.

The conjugate margins of Wilkes Land, Antarctica, and the Great Australian Bight (GAB) are amongst the least understood continental margins. Break up along the GAB-Wilkes Land part of the Australian-Antarctic margin commenced at approximately 83 Ma. Using recent stratigraphic interpretations developed for the GAB, we have established a sequence stratigraphy for the Wilkes Land margin that will, for the first time, allow for a unified study of the conjugate margins. By reconstructing the two margins to their positions prior to break up we were able to identify comparable packages on the Wilkes Land margin to those recognised on the GAB margin. Excluding the glacial sediments on the Antarctic margin, the sedimentary sequence along the Wilkes Land margin is very thin compared to the GAB margin, which has substantially more syn- and post-rift sediments. Despite the differences in thickness, the syn-rift sedimentary package on the Wilkes Land margin exhibits a similar style of extensional faulting and seismic character to its GAB margin counterpart. In comparison, post-rift sequences on the Wilkes Land margin are markedly different in geometry and seismic character from those found on the GAB margin. Isopach mapping shows substantial differences in the thickness of the post-breakup sediments, suggesting different sediment sources for the two margins. The Late Cretaceous Hammerhead Supersequence provides much of the post-rift thickness for the GAB margin as a result of large sediment influx into the basin. This supersequence is characterised by a thick progradational succession and was deposited in fluvio-deltaic and marine environments. The equivalent succession on the Wilkes Land margin has a different seismic character. It is thinner and aggradational, suggesting a distal marine environment of deposition.

Abstract for Indonesian Geophysics Conference (HAGI)

Outline of SS05/2011 (GA0332) prepared for CSIRO in their Marine National Facility Voyage Summary template. Includes summary of: Objectives and Voyage Narrative; Principal Investigators; Measurements and Samples Taken; Curation Report; Track Chart; and Personnel.