Although there are two contrasting views presented in the literature,
it is misleading to characterize the opposing views as comparable in
terms of their breadth and volume of research. We have found only
two published papers that specifically interpret data from the Cape
Region as indicating tectonic stability, i.e. Hearty et al. (2007) and
O'Leary et al. (2008a). Both are widely cited, both assert tectonic stability
of the WA coastline, and both conclude that there are two eustatic
MIS 5e highstands (two distinct LIg marine terraces) evident in the
Cape Region. It appears intrinsic to their conclusions that either the
coast is tectonically active or there were two highstands. We do not
agree that these conditions are mutually exclusive.