Dating inscriptions is difficult because you usually can't directly date the removed material. The typical method is to start constraining when the carvings cou

Dating inscriptions is difficult because you usually can't directly date the removed material. The typical method is to start constraining when the carvings could possibly have been made. The Winnemucca lake petroglyphs are a good example of this process [0]. I'm unable to find a public field report for the site, but my guess is that the 9kya date is a terminus ante quem for when the site was flooded and the stones submerged. [0] https://en.wikipedia.org/wiki/Winnemucca_Lake#Petroglyphs https://en.wikipedia.org/wiki/Winnemucca_Lake#Petroglyphs