Stepping out across the Karoo retro-foreland basin : Improved constraints on the Ecca-Beaufort shoreline along the northern margin - Groenewald, David (Institut Català de Paleontologia Miquel Crusafont) ; Day, Michael Oliver (Natural History Museum. Department of Earth Sciences) ; Penn-Clarke, Cameron (Council for Geoscience (South Africa)) ; Rubidge, Bruce (University of the Witwatersrand. Evolutionary Studies Institute)