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U/Th data obtained on CaCO 3 layers covering rock art at Nerja Cave (Spain) evidence erroneous ages and an inverse relation between uranium concentration and apparent ages. This open system behavior could be due to a mechanism causing uranium mobility, resulting in apparent ages being too old with respect to their real age. This article also questions recently published U/Th data on samples from Ardales, Maltravieso and La Pasiega caves (Spain) where a few U/Th ages older than 40 ka BP, suggested that cave art could be attributed to Middle Palaeolithic population (Hoffmann et al., 2018). For these caves, U/Th data also display an inverse relation between U content and ages, indicating possible uranium mobility and erroneous ages. • U/Th data were obtained on CaCO 3 layers covering rock art at Nerja cave (Spain). • Inverse relation between U content and ages, suggest U mobility and wrong ages. • An inverse relation between U content and U/Th exists for previously published data. • The validity of old U/Th ages on spanish rock art published previously is questioned. [ABSTRACT FROM AUTHOR]