A gomphothere jawbone as it was found in place, upside down, at the El Fin del Mundo site in Mexico.
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Credit: Joaquin Arroyo-Cabrales/Instituto Nacional de Antropología e Historia
This gomphothere jawbone was unearthed at a Clovis hunting site in Sonora, Mexico.
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Credit: Sergio de la Rosa
Sculptures by artist Sergio de la Rosa show three elephant ancestors, from left to right: the mastodon, the mammoth and the gomphothere.
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Credit: INAH Sonora
A quartz Clovis point from El Fin del Mundo, an archaeological site in Sonora, Mexico.
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Credit: Center for the Study of the First Americans/Texas A&M University
The Clovis blade technology spread rapidly across North America. Here are Clovis points from various sites in the United States.
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Becky Oskin is a senior writer for Live Science. She covers earth science, climate change and space, as well as general science topics. Becky was a science reporter at The Pasadena Star-News and has freelanced for New Scientist and the American Institute of Physics. She earned a master's degree in geology from Caltech, a bachelor's degree from Washington State University, and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what her latest project is, you can follow Becky on Google+.