Evidence from an archaeological site in Ethiopia suggests ancient humans adapted their diet during a dry spell after the Toba volcano eruption 74,000 years ago
An campsite in what is now Ethiopia may have been used for a few years before, during and after a huge volcanic eruption 74,000 years ago that altered Earth’s climate.
In the middle of the layer of sediment containing the stone chips and bones, the team also found volcanic ash in the form of minuscule pieces of glass known as cryptotephra. “They are just tiny, tiny glass shards,” says Kappelman – and their composition matches others from the Toba super-eruption. The team’s explanation for this is that the Shinfa river is seasonal and dries up, leaving waterholes in the dry season. Immediately after the Toba eruption, the dry season was longer, so the fish in the shrinking waterholes were easier to catch. This made up for the fall in terrestrial prey animals, the researchers suggest.Other researchers have argued that when conditions got drier, early humans moved to places that were wetter, he says.
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