Ale's Stones at Kåseberga, around ten kilometres south east of Ystad, Sweden were dated at 600 AD using the Carbon–14 method on organic material found at the site.

Radiometric dating (often called radioactive dating) is a way to find out how old something is. The method compares the amount of a naturally occurring radioactive isotope and its decay products, in samples. The method uses known decay rates. It is the most used method of geochronology, the main way to learn the age of rocks and other geological features, including the age of the Earth itself.