Four names scratched into a metre-wide Texas rock face damaged abstract petroglyphs or rock drawings — swirls and lines — etched into the desert rock up to 8,500 years ago, according to Big Bend National Park officials.
source https://www.cbc.ca/radio/asithappens/as-it-happens-monday-edition-1.6309540/archeologists-struggle-to-repair-vandals-damage-to-ancient-petroglyphs-in-texas-1.6309751?cmp=rss
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