Volcanic ash layer dating

About the same time the eruption took place, the number of modern humans apparently dropped cataclysmically, as shown by genetic research.

People today evolved from the few thousand survivors of whatever befell humans in Africa at the time.

"Whilst from this we can hypothesize that the global climatic impact was not as dramatic as some have suggested, we will need to find similarly high-resolution records of past climate from other regions that also contain Youngest Toba Tuff in order to definitively test this," Lane said. Choi is a contributing writer for Live Science and

He covers all things human origins and astronomy as well as physics, animals and general science topics.

The layer is so small that if we leave any gaps in our search, we could miss it completely." Their analysis discovered that a thin layer of ash in this sediment about 90 feet (27 m) below the lake floor was from the last of the Toba eruptions, known as Youngest Toba Tuff.

Nevertheless, in a lot of records I have worked on previously, even within just a few hundreds of miles of an eruption center, we sometimes only find less than 100 shards of glass within a gram of sediment.

For instance, prehistoric artifacts discovered in India and dating from after the eruption hinted that people coped fairly well with any effects of the eruption.

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