This service has been created specifically for display in the National Map and the chosen symbology may not suit other mapping applications. The Australian Topographic web map service is seamless national dataset coverage for the whole of Australia. These data are best suited to graphical applications. These data may vary greatly in quality depending on the method of capture and digitising specifications in place at the time of capture. The web map service portrays detailed graphic representation of features that appear on the Earth's surface. These features include the administration boundaries from the Geoscience Australia 250K Topographic Data, including state forest and reserves.

<div>The Abbot Point to Hydrographers Passage bathymetry survey was acquired for the Australian Hydrographic Office (AHO) onboard the RV Escape during the period 6 Oct 2020 – 16 Mar 2021. This was a contracted survey conducted for the Australian Hydrographic Office by iXblue Pty Ltd as part of the Hydroscheme Industry Partnership Program. The survey area encompases a section of Two-Way Route from Abbot Point through Hydrographers Passage QLD. Bathymetry data was acquired using a Kongsberg EM 2040, and processed using QPS QINSy. The dataset was then exported as a 30m resolution, 32 bit floating point GeoTIFF grid of the survey area.</div><div>This dataset is not to be used for navigational purposes.</div>

Geoscience Australia carried out a marine survey on Carnarvon shelf (WA) in 2008 (SOL4769) to map seabed bathymetry and characterise benthic environments through colocated sampling of surface sediments and infauna, observation of benthic habitats using underwater towed video and stills photography, and measurement of ocean tides and wavegenerated currents. Data and samples were acquired using the Australian Institute of Marine Science (AIMS) Research Vessel Solander. Bathymetric mapping, sampling and video transects were completed in three survey areas that extended seaward from Ningaloo Reef to the shelf edge, including: Mandu Creek (80 sq km); Point Cloates (281 sq km), and; Gnaraloo (321 sq km). Additional bathymetric mapping (but no sampling or video) was completed between Mandu creek and Point Cloates, covering 277 sq km and north of Mandu Creek, covering 79 sq km. Two oceanographic moorings were deployed in the Point Cloates survey area. The survey also mapped and sampled an area to the northeast of the Muiron Islands covering 52 sq km. cloates_3m is an ArcINFO grid of Point Cloates of Carnarvon Shelf survey area produced from the processed EM3002 bathymetry data using the CARIS HIPS and SIPS software

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2013 Acreage Release Areas W13-19 and W13-20 in the offshore northern Perth Basin, Western Australia, cover more than 19,000 km2 in parts of the Houtman, Abrolhos, Zeewyck and Gascoyne sub-basins. The Release Areas are located adjacent to WA-481-P, the only offshore exploration permit active in the Perth Basin, granted to joint venture partners Murphy Australia Oil Pty Ltd, Kufpec Australia Pty Ltd and Samsung Oil and Gas Australia Pty Ltd in September 2012. Geoscience Australia recently undertook a regional prospectivity study in the area as part of the Australian Government's Offshore Energy Security Program. A revised sequence stratigraphic framework, based on new biostratigraphic sampling and interpretation, and an updated tectonostratigraphic model, using multiple 1D burial history models for Permian to Cenozoic sequences, give fresh insights into basin evolution and prospectivity. Geochemical studies of key offshore wells demonstrated that the late Permian's Lower Triassic Hovea Member oil-prone source interval is regionally extensive offshore in the Abrolhos and potentially Houtman sub-basins. This is supported by fluid inclusion data that provides evidence for palaeo-oil columns within Permian reservoirs in wells from the Abrolhos Sub-basin. Additionally, oil trapped in fluid inclusions in Houtman-1 can be linked to Jurassic source rocks suggesting that multiple petroleum systems are effective in the Release Areas. A trap integrity analysis was undertaken to mitigate exploration risks associated with trap breach during Early Cretaceous breakup and provides a predictive approach to prospect assessment. Potential seepage sites on the seafloor over recently reactivated faults correlate with hydroacoustic flares, pockmarks and dark colored viscous fluid observed over the areas. These observations may indicate an active modern-day petroleum system in the Houtman Sub-basin. The presence of a Jurassic petroleum system combined with the extension of the Hovea Member source rock offshore, the potential presence of seeps and results from trap integrity studies provide a platform to revitalize exploration in the offshore northern Perth Basin. The APPEA Journal

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