Richard Lease and Steven Andrews, Princeton University (IMAGE)

Princeton University

Richard Lease and Steven Andrews, Princeton University

Caption

Much of the new data comes from a trench dug out of low-lying hills in northeastern Mexico at a site called El Peñon. A group of Princeton undergraduates, including Richard Lease (left) and Steven Andrews (right), accompanying Princeton Professor Gerta Keller on a field trip to Mexico in 2004 excavated the area and uncovered the new evidence. Keller and her team have been analyzing that evidence for the last several years.

Credit

Photo: Courtesy of Gerta Keller

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