
© Boyd et al., 2025, Science Advances
Archaeologists working in the canyonlands of southwest
Texas have
discovered that some of North America's most iconic cave paintings are far older than previously believed. According to new scientific dating, Pecos River-style murals found along the U.S.-Mexico border may have been first created nearly 6,000 years ago, revealing a remarkably
long and continuous artistic tradition among ancient hunter-gatherer societies.The findings come from a large interdisciplinary study led by Dr. Carolyn E. Boyd of Texas State University, published in
Science Advances. The research redefines what is known about early ritual art in North America and challenges outdated assumptions about the complexity of forager cultures.
A Sacred Landscape Along the Rio GrandeThe Lower Pecos Canyonlands, located near the Rio Grande, contain hundreds of rock shelters formed by limestone overhangs. These natural alcoves provided smooth, protected wall surfaces — ideal conditions for painting. Many murals remain in the same locations where rituals and ceremonies likely took place thousands of years ago.
The paintings themselves are visually striking. Artists used red ochre, black pigments, and yellow mineral tones to create dense scenes filled with human-like figures, animals, and abstract symbols. Some murals stretch across large rock faces and contain dozens of carefully arranged elements, suggesting deliberate composition rather than spontaneous decoration.
Why Dating Cave Paintings Is So DifficultDating ancient rock art has long been one of archaeology's greatest challenges. Mineral pigments alone cannot be radiocarbon dated because they contain no organic material. However, prehistoric artists often mixed pigments with organic binders, such as plant resins or animal fats, to help paint adhere to stone.
These binders left behind microscopic traces of carbon. By isolating and dating this carbon, researchers can estimate when the paint was originally applied.
To avoid contamination from soot, groundwater, or later human activity, the research team carefully sampled organic residue embedded within specific paint layers, rather than scraping the rock surface itself.