Eocene stratigraphic succession in the Eucla Basin of South Australia and correlation to major regional sea-level events |
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| Institution: | 1. Geological Survey of Western Australia, 100 Plain St, East Perth, WA 6004, Australia;2. Centre for Tectonics, Resources and eXploration (TRaX), School of Earth and Environmental Sciences, The University of Adelaide, Adelaide, SA 5005, Australia;3. Centre for Exploration Targeting, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;4. School of Earth and Ocean Sciences, Cardiff University, Cardiff, Wales, CF10 3XQ, United Kingdom;1. Department of Earth and Environmental Sciences, University of Milano-Bicocca, Milan, Italy;2. Department of Earth and Planetary Sciences, Birkbeck College, University of London, UK;3. Institute of Geological Sciences, University of Bern, Switzerland |
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| Abstract: | Using palynostratigraphy combined with analysis of lithostratigraphy and sedimentary facies of discontinuous outcrops and selected drillholes, we have investigated whether the Eocene sequences and their boundaries in the Eucla Basin of South Australia were synchronous with major sea-level events. The correlation of Eocene sequences and their boundaries in the eastern nearshore and onshore Eucla Basin indicates that these complex marine–nonmarine strata fall into four sequences or allostratigraphic packages that can be seen from the offshore basin to nearshore and onshore basin, including palaeovalleys. Key sedimentary surfaces (disconformities, a tidal/wave ravinement surface, transgressive surfaces, maximum flooding surfaces) bound the packages (including three new revised units) and are coincident with four third-order sequence boundaries. The eastern Eucla Basin stratigraphy accords with the general view of Eocene sea-level patterns and elucidates a stepwise evolution of marine and nonmarine environments. |
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