Archaeologists often seek to understand ancient cultures by studying images left behind on rock faces. While these images vary widely, they're a global phenomenon. In fact, petroglyphs and painted murals created by past societies have so far been found on every continent, except Antarctica.

And, in a new study, researchers say they’ve found evidence of consistent imagery on cliff faces, caverns and natural recesses in 12 sites in the Lower Pecos Canyonlands — an archeological region in southwestern Texas and Northern Mexico — providing evidence of consistent themes in the murals across 175 generations. They say this continuity suggests that, in both regions, hunter-gatherers' conception of the universe — which the team calls their "cosmovision" — stayed largely the same across roughly 4,0

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