Comments on “Gravity Fault Subsidence and Beach Ridges Progradation in Quinta Cassino (RS) Coastal Plain, Brazil” by Bruno Silva da Fontoura, Adelir José Strieder, Iran Carlos Stalliviere Corrêa, Paulo Rogério Mendes, Alexandre Felipe Bruch, Angélica Ciro

The paper of Fontoura et al. (2024) presented results based on the interpretation of GPR records of good quality. However, after reviewing and analyzing their paper, we concluded that Fontoura et al. (2024) failed to show that gravity-driven large-scale faults control the mechanical subsidence and sedimentation of the prograding beach ridges in the Quinta-Cassino strandplain in southern Brazil. In this comments, the paper of Fontoura et al. (2024) is criticized due to: 1- the lack of presentation of appropriate data supporting the occurrence of potential recent tectonic events in the study area, 2- both a lack of criteria and wrong interpretations of GPR records, 3- disregard for the existence of direct data from 15 drill holes that could have been used to validate their solely indirect data, 4- a very poor discussion (in fact, no discussion at all) of their results with previous studies, and 5- a flawed and entirely incorrect interpretation of a wave-dominated coastal barrier as a deltaic depositional system.