newscientist.com

Cave art pigments show how ancient technology changed over 4500 years (www.newscientist.com)

A huge stash of reddish minerals from a cave in Ethiopia shows how Stone Age people gradually adapted their technologies and practices over a 4500-year period. This material included 4213 pieces of “ochre” – an umbrella term for minerals that are rich in iron and consequently have vivid colours, typically red. Prehistoric...

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