Dating prehistoric paintings
These calcium carbonate deposits, which can take the form of "cave popcorn" (shown here) contain radioactive uranium.
Dating back to around 40,000 years ago, paintings in Indonesian caves of human hands and pig-deer may be the oldest ever found — or, at the very least, comparable in age to cave art in Europe."Now a lot has been damaged through exfoliation, pieces falling off.And others are covered by calcium carbonate." CREDIT: Screengrab, Nature Video.Photo: Serra da Capivara The Serra da Capivara National Park in northeast Brazil is home to numerous rock shelters that are decorated with cave paintings.The paintings include scenes of rituals and hunting, trees and animals capivaras.