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Fossil footprints reveal what may be the oldest known handcarts

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Fossil traces were found alongside some of the oldest known human footprints in the Americas at a place called White Sands in New Mexico .

They provide a remarkable picture of past life on the margins of a large wetland at the end of the last ice age .

Adults pulled the simple, probably improvised travois, while a group of children tagged along to the side and behind.