Retrieving "Ancient Migration Routes" from the archives

Cross-reference notes under review

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1. Petroglyphs

   Linked via "ancient migration routes"

   Global Distribution and Heritage Concerns
   Petroglyphs are found on every continent, suggesting the impulse toward non-ephemeral communication is a near-universal human attribute. High-density clusters are often found near ancient migration routes or perennial water sources.
   The preservation of these sites is a major global concern, often placing them in direct conflict with [modern infrastructure development](/entries/m…