Willrd f libby invented carbon dating
Radio carbon dating determines the age of ancient objects by means of measuring the amount of carbon-14 there is left in an object.
A man called Willard F Libby pioneered it at the University of Chicago in the 50's. This is now the most widely used method of age estimation in the field of archaeology.
By contrast, methane created from petroleum showed no radiocarbon activity.
The results were summarized in a paper in Science in 1947, in which the authors commented that their results implied it would be possible to date materials containing carbon of organic origin.
The element carbon exists in several different isotope forms (carbon-12, carbon-13 and carbon-14), depending on the number of neutrons in its atom.