SEMINAR: Using the Land-Ocean Transition to Understand Past Coastal Landscapes
|Using the Land-Ocean Transition to Understand Past Coastal Landscapes : A public lecture by Mark Bateman, Director Sheffield Luminescence Dating Laboratory, University of Sheffield and Institute of Advanced Studies Visiting Fellow
Coastal dunes can contain lengthy, but complex, records of long-term environmental, climatic and sea-level fluctuations particularly where the dune sand has become lithified into aeolianite or calcarenite. Both Australia and South Africa have fairly widespread occurrence of on-shore coastal aeolianites. Aeolianites can form shore-parallel barrier reaching up to 200 m above modern sea level and up to a few km inland.
This talk will focus on Professor Batemanís research on the South African aeolianites which occur in association with world renown Middle Stone Age archaeological sites. The aeolianites provided the caves and at times dune sand inundated or blocked caves aiding archaeological preservation. But why did our early ancestors choose to live in dunefields? What was the environment and coastline like then and how has it changed through time? This talk will show how integrating off-shore and on-shore topography with an extensive luminescence dating programme allows for a better understanding of the evolution of coastlines through time. The sediments themselves can also be used to gives hints of the humans, animals and plants occupying past dunes.
We now know the preserved terrestrial dunes have been constructed over at least the last two glacial-interglacial cycles (back to ~270,000 years) with multiple phases of deposition during sea-level high-stands. Tectonic stability of the region allowed shorelines to reoccupy similar positions on multiple occasions with sediment deflated from beaches building large stacked dunes. Local variation in the off-shore topography controlled when and where these stacked dunes formed. As global sea-levels rose during non-glacial times so pre-existing dunes were eroded and recycled into new on-shore dunes. As global sea-levels fell during glacial times so dune construction moved out onto what is currently the off-shore platform. Thus whilst the preserved on-shore dune and archaeological record looks fragmented this reflects the big changes in coastline position which have occurred in the past. When sea-levels were high, people occupied caves in the aeolianite and utilised both marine resources and the diverse flora and fauna found on the shifting dunes. When sea-levels were lower they followed the coast-line and dunefields onto the newly exposed coastal plain.
Mark Bateman was appointed at the University of Sheffield in 1995 as a post-doctoral researcher to set up and run the Sheffield Luminescence Laboratory and in 1998 was appointed as a lecturer. He was promoted to senior lecturer in 2004, reader in 2007 and became a Professor in 2011. He is a world-leading expert on research on sediments as an archive for better understanding past depositional processes and environmental changes. In particular, he has applied and developed luminescence dating as a tool for understanding the ages of sediments but also post-depositional disturbance they may have undergone since burial. His work has spanned from understanding coastal dunes, coastline changes and Middle Stone Age archaeology in South Africa to dating the retreat sequence of the Last British and Irish Icesheet. He has also undertaken research in Arctic Canada on cold-climate aeolian systems and periglacial sediments. He has over 180 research publications including in Nature and recently published the Handbook of Luminescence Dating (2019, Whittles Publishing).
Professor Mark Bateman
Fox Lecture Theatre, Arts Building, UWA
Dr Ingrid Ward
Thu, 12 Sep 2019 18:00
Thu, 12 Sep 2019 19:00
Karen Eichorn <email@example.com>
Thu, 15 Aug 2019 11:51
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