A prehistoric human skeleton in a cave near Tulúm on the Yucatán peninsula prior to looting by unknown cave divers. | Tom Poole, Liquid Jungle Lab

The Oldest Known Human Remains in the Americas Have Been Found in a Mexican Cave

The find is prompting scientists to rethinking how — and when — people first arrived in the Americas.

Co-author Eugenio Acevez Nuñez of the Institute of American Prehistory examines fossils and other materials in the Chan Hol cave. | Tom Poole, Liquid Jungle Lab
A basalt tool excavated at Monte Verde, Chile | Tom Dillehay