Photo: Valley of Fire
Rock Art = Human-made markings placed on natural stone
Please do not touch the rock art because contact with the oils in skin will damage them. You may take photographs and sketches, but rubbings are not permitted. Avoid climbing near rock art sites.
Aboriginal rock art may depict first sea arrivals
Push on to protect Australia’s rare rock art
Rock art at risk
Aboriginal rock art at risk from mining – interactive map
Google Art Project
Rock art goes digital – The Djulirri rock art complex in the north of Australia contains some extraordinary ancient works. And new technologies have allowed them to be digitised and available to the world for the first time.
Rough ride to rock etchings worth the trip
Nevada petroglyphs the oldest in North America
Dating North America’s Oldest Petroglyphs
CU-Boulder led research effort dates oldest petroglyphs known in North America
https://www.texasobserver.org/if-these-walls-could-talk – @bradtyer