palaeogeography
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The Northern Perth Basin Cross-Section has been designed to highlight the structure and stratigraphy of this part of the basin, presenting basic data as well as giving an interpretation. This has been achieved by choosing a selection of the highest quality seismic data that, where possible; * crosses major tectonic elements, * cuts the structural grain perpendicularly, * intersects significant wells, and * highlight structure and seismic stratigraphy. Also, by using the palaeontology and lithology from the most useful petroleum exploration and other wells, the seismic sequences and hence the structure, stratigraphy and palaeogeography were identified, assessed and linked to the time slices (TS) of the Palaeogeography Mapping Project.
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Legacy product - no abstract available
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No product available. Removed from website 25/01/2019
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Legacy product - no abstract available
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Multibeam sonar mapping, drill cores and underwater video data have confirmed the existence of a previously unknown reef province in the Gulf of Carpentaria, Australia. Seven reefs, comprised of coral limestone that support living corals have been mapped so far and as many as 50 other reefs may exist in the region. U/Th ages show that reef growth commenced shortly after limestone pedestals were submerged by rising sea level around 10.5 kyr BP, making them the oldest reefs known in Australia. Reef growth persisted for ~2.0 kyr but it had ceased at most locations by ~8.0 kyr BP. Measurements of reef growth rates (0.95 to 4 m kyr-1), indicate that the reefs were unable to keep pace with contemporaneous rapid sea level rise (>10 m kyr-1), which is consistent with a 'give up' reef growth history. Core samples from reef platforms demonstrate that Pleistocene limestone is exposed in depths of 27 and 30 m below present mean sea level. These depths represent regionally significant phases of reef growth during a prolonged sea level still stand. We conclude that the reefs are therefore mostly relict features, whose major phase of growth and development relates to an earlier, pre-Holocene sea level stillstand.
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No product available. Removed from website 25/01/2019
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Apatite fission track and vitrinite reflectance data suggest considerable mid to Late Cretaceous deposition in the Murray Basin area, and substantial erosion of this sediment prior to sedimentation in the Murray Basin commencing in the Late Palaeocene/Early Eocene.
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Previously undated post Devonian sediments are shown by plant macro- and microfossils to be Early Cretaceous, and thus part of the Eromanga Basin. Modern landscape in the northern Barrier Ranges results from differential erosion following post-Early Cretaceous deformation that folded these and underlying rocks, most probably in response to reverse movements on faults at the western margin of the Bancannia Trough.
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No product available. Removed from website 25/01/2019
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No product available. Removed from website 25/01/2019