Jasper Knight first expresses his disappointment that my article—in his eyes—does not answer the question of whether beachrock is a sea-level indicator and that I do not consider the age of beachrocks and the cementation style and process. In particular, he is disappointed that I have not referred to the recent literature on beachrock cementation. He then continues that beachrock near sea level may well be pre-Holocene in age and that the cementation process has been clarified by many recent articles, and he argues on the use of beachrock as a sea-level indicator. A case study from SE Spain follows. In his outlook, Knight concludes that beach-rock is formed with the interaction of marine and ground-water, is thick, is formed in phases, is linked to sediment supply, and is forming at the present time at depths within the beach itself.
Reading his comment gives the impression that all open questions...
