1. Geophysics and Remote Sensing Unit, Council for Geoscience Western Cape regional office, South Africa African Centre for Coastal Palaeoscience, Nelson Mandela University, Gqeberha (Port Elizabeth), South Africa e-mail: hcawthra@geoscience.org.za
2. Research Department, Iziko South African Museum, Cape Town, South Africa Department of Environmental and Geographical Sciences, University of Cape Town, South Africa e-mail: eugene.bergh@alumni.uct.ac.za
3. South African Institute for Aquatic Biodiversity, Makhanda, South Africa Institute for Coastal and Marine Research, Nelson Mandela University, Gqeberha, South Africa e-mail: EA.Wiles@saiab.nrf.ac.za
4. Department of Geological Sciences and the Marine Research Institute, University of Cape Town, South Africa e-mail: john.compton@uct.ac.za