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Radioactive dating problems

Optical dating, also known as optically stimulated luminescence (OSL), dates the last time mineral sediments (usually quartz or feldspar grains ) were exposed to sunlight.

It is most useful for minerals older than 100,000 years and can reach way back into the geological past.

The measurement is based on an isotope of potassium that radioactively decays at a known rate into argon.

K-Ar dating has been used to date lava flows above and below archaeological deposits that contain important hominid fossils in Africa's Olduvai Gorge.

Dates above and below a location provide minimum and maximum age determinations according to the law of superimposition.