Ancient Footprints Found in Mexico ValleyOctober 26th, 2006 in Other Sciences / Archaeology & Fossils
(AP) -- A trail of 13 fossilized footprints running through a valley in a desert in northern Mexico could be among the oldest in the Americas, Mexican archeologists said.
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"Ancient Footprints Found in Mexico Valley." October 26th, 2006. http://phys.org/news/2006-10-ancient-footprints-mexico-valley.html