lower pecos cave paintings radiocarbon date 2723015

Three Texas-based researchers have successfully radiocarbon dated ancient cave paintings in the Lower Pecos Canyonlands along the Rio Grande border between Mexico and West Texas, using a novel combination of technologies. By dating the deer bone marrow used as a paint binder—rather than the mineral pigments themselves—and employing plasma oxidation to extract carbon, the team analyzed 53 figures across 12 sites. Their findings, published in *Science Advances*, reveal that individual murals were created in single painting events, not accumulated over centuries, and that the paintings span four millennia, from about 5,760 to 1,035 years ago.