UR 501 jawbone is the oldest known fossil in the world. Its estimated to be 2.5 - 2.3 million years old. A new study researcher examined the ancient footprint in white sand national park in Mexico around 2500 year old. The footprint formed in soft mud most of track belonged to children may be youngstar played in the area while adult hunted and gathered. According to researchers, they would have had to settle near the artic because in covered canada. made it impossible for them to go south. Later once this glacier melted around 13000 - 16,000 years ago the migration toward south america Began.
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