Comments on “The coastal ridge sequence at Rio Grande do Sul: A new geoarchive for past climate events of the Atlantic coast of southern Brazil since the mid Holocene” by Milana J.P., Guedes C.C.F. and Buso V.V. 2016 (Quaternary international 438, 187-199

The paper of Milana et al. (2016) presented interesting palaeoclimatic results related to the evolution of a foredune ridge plain of a regressive (prograded) barrier in southern Brazil. Unfortunately, they presented an evolutionary model for a type of wave-dominated delta, and not for a coastal barrier. By not classifying the regressive barrier of Cassino properly, the authors made a succession of incorrect interpretations, such as the nature of littoral drift directions during the progradation of the ridge plain. By using their delta model, they obtained opposite directions than the actual ones. In challenging the barrier model of the area, which has been well-established for more than 50 years, they should have more fully discussed the differences between deltas and barrier systems, in a manner which would have given support to their interpretations.