Abstract
In recent years, Uranium-thorium dating of the calcite crusts covering prehistoric cave drawings has yielded increasingly older dates. However, this method suffers from a bias that tends to overestimate the age of the samples and is difficult to detect, so many researchers are inclined to accept these very old dates without questioning their validity. It is imperative to exercise the utmost caution by conducting a physicochemical analysis of the samples and performing cross-dating using the carbon-14 method (or another method) on the same samples.