Toluquilla ash sample

Toluquilla ash sample

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Credit: PAUL AVIS/SCIENCE PHOTO LIBRARY

Caption: Toluquilla ash sample. This sample of ash is from a deposit known as Xalnene Ash, found at the Cerro Toluquilla site in the Valsequillo Basin, Central Mexico. The ash is thought to have been formed from the eruption of an underwater volcano, and is heterogeneous (coarse) in composition. In 2003, a large collection of prehistoric footprints (animal and human) were discovered in this ash deposit. In 2005, the ash was dated to about 40,000 years ago, challenging previously accepted theories about when the Americas were colonised.

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