An article posted on Arcaheology.org talked about the ongoing debate over the age and authorships of ancient cave paintings. The Spainish cave paintings are believed to depict a dating technique called U-Th. If this is the correct depiction then researchers would know the minimum age of the cave painting. They also have collected mineral deposits containing trace amounts of uranium, which decays at a uniform steady rate.
Researchers have collected these materials and have set the minimum date of more than 64,000 years ago. Modern homosapiens have entered that region of Spain until about 40,000, then this concluded these paintings were produced by Neanderthals. Concerns have been made however regarding their scholarly work. Questions over the cognitive ability of the Neanderthals to have produced the artwork. It is also a concern that running water of the cave water could have reduced the uranium levels and mineral deposits. This would indicate that the uranium had been decaying longer than it actually would have been. Some speculate that the Spainish cave art could be much more recent and much more into this timeline of modern humans.
You can read the full article at:
https://www.archaeology.org/news/8147-191030-spain-neanderthal-cave-art
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Art & Arch 