Natural Processes in the Degradation of Open-Air Rock-Art Sites: An urgency intervention scale to inform conservation

Open-air rock-art forms one of the most widely distributed categories of prehistoric culture with examples recognized across the Old and New Worlds. It is also one of the most threatened features of human heritage and is susceptible to accelerated decay as a result of natural processes. Considering the specific case of the Côa Valley rock-art complex in Portugal, but also analysing case studies originating from other countries (Norway, Brazil, Southern USA and South Korea), this richly illu...