Zambia

Sand Origin

Riverbank of Mulungushi River, 18 m north of Kabwe

Random Sand Fact

Imagine uncovering a 500,000-year-old campfire: The presence of sand at Kalambo Falls in Zambia places vivid stories of prehistoric human life on a timeline.

Fine layers of sand have preserved remains, tools, and artifacts in a neat chronological sequence. But there’s more.

Untouched layers of sand are archaeologists’ dreams, especially when combined with optically stimulated luminescence (OSL) dating.

OSL acts like a sand timer. When sunlight hits the sand, the timer starts, running as long as it stays dark. With OSL, scientists can see how long it’s been dark, placing findings with near-exact years in historical time.

Sand spills secrets!

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