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Such unadulterated crystals can be dated using a technique called potassium-argon dating."By dating the crystals held in the pumice, you can say with a high level of confidence that everything in that member [group of sediment layers] is nearly the same date," Brown said.

This term means that older artefacts are usually found below younger items.

When an archaeological site is excavated the sides of the unexcavated baulk reveals layering of subsequent settlements and activity.

From an analysis of DNA of thousands of men around the world, Wells says he has discovered that all humans alive today can be traced back to a small tribe of hunter-gatherers who lived in Africa 60,000 years ago.

"Many anthropologists, myself included, believe that what makes us truly human is our modern behavior, enabled by a modern brain," Wells said.

"Modern behavior starts to show up sporadically around 70,000 to 80,000 years ago but doesn't really take off until around 50,000 years ago—the "Great Leap Forward" and dawn of the Upper Paleolithic [early Stone Age]." The human population appears to have crashed to around 2,000 individuals around 70,000 years ago, at the same time they were headed into the worst part of the last ice age.

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