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A number of methods are used, all of which have their advantages, limitations and level of accuracy.
Complex dating problems often use a variety of techniques and information to arrive at the best answer.
The unusual relationship and age gap isn't making waves in France, but it's getting a lot of attention in other parts of the world.Optical dating, also known as optically stimulated luminescence (OSL), dates the last time mineral sediments (usually quartz or feldspar grains ) were exposed to sunlight.In the Willandra area it is typically used on quartz sand grains which have been buried and have not been exposed to sunlight since burial.The method also assumes a 'zeroing' event in the life of the material, when it was either last heated or exposed to sunlight.
Editor's note: Emmanuel Macron is a favorite to win the French presidential election this Sunday, but he's making headlines for more than his political success.Four main methods have been used in Willandra archaeology.