Age dating the Earth Geochronology is the scientific study of the age of the Earth and the temporal sequence of events related to the formation of the planet and the history of life on Earth. The word is derived from Geo meaning Earth , and chronology , which is the study of time, or a record of events in the order of their occurrence timeline. It is from this field of study that fossils and artifacts are dated based on the perceived age of the geological layers in which they are located. Geologists determine the age of rocks , fossils , and sediments using a variety of methods including relative and absolute dating. When dating an object, a geologist measures some physical property of the object, which is believed to provide evidence regarding its age. All dating methods rely upon assumptions about the past.
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Dating On Earth
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The age of the Earth is estimated to be 4. Following the development of radiometric age-dating in the early 20th century, measurements of lead in uranium-rich minerals showed that some were in excess of a billion years old. It is hypothesised that the accretion of Earth began soon after the formation of the calcium-aluminium-rich inclusions and the meteorites.