New technology for dating ancient rock paintings

March 11, 2009

A new dating method finally is allowing archaeologists to incorporate rock paintings — some of the most mysterious and personalized remnants of ancient cultures — into the tapestry of evidence used to study life in prehistoric times. That’s the conclusion of a new report in ACS’ Analytical Chemistry.

In the study, Marvin W. Rowe points out that paintings, or , are among the most difficult to date. They lack the high levels of organic material needed to assess a pictograph’s age using , the standard archaeological technique for more than a half-century. Rowe describes a new, highly sensitive dating method, called , that requires only 0.05 milligrams of carbon (the weight of 50 specks of dust). That's much less than the several grams of carbon needed with radiocarbon dating.

The research included analyzing pictographs from numerous countries over a span of 15 years. It validates the method and allows rock painting to join bones, pottery and other artifacts that tell secrets of , Rowe said. “Because of the prior lack of methods for dating rock art, archaeologists had almost completely ignored it before the 1990s,” he explained. “But with the ability to obtain reliable radiocarbon dates on pictographs, archaeologists have now begun to incorporate rock art into a broader study that includes other cultural remains.”

More information: Analytical Chemistry "Radiocarbon Dating of Ancient "

Provided by ACS

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