Neandertal in origin. Emma Woolacott writes:
Such paintings can't be dated using standard radiocarbon dating, as they contain no organic pigment. But an international team used a new method to examine 50 paintings in 11 caves in Northern Spain, including the UNESCO World Heritage sites of Altamira, El Castillo and Tito Bustillo.It would be really neat if they were hand prints of Neandertals and would give us another window into their thought processes, which seem more like ours every day.
They dated the formation of tiny stalactites on top of the paintings using the radioactive decay of uranium, giving a minimum age for the pictures.
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