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Geologic age dating methods

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About

Geochronology

In Context Earth Science: Geologists divide this age into major and minor units of time that describe the kinds of geological processes and life forms that existed in them. Earth's geologic record was formed by constant change, just like those that occur routinely today. Though some events were catastrophic, much of Earth's geology was influenced by normal weather, erosion, and other processes spread over very long geologic ages. Accurate dating of the geologic ages is fundamental to the study of geology and paleontology, and provides important context to the life sciences, meteorology, oceanography, geophysics, and hydrology. Historical Background and Scientific Foundations In the mid-seventeenth century, James Ussher — , the Archbishop of Ireland, compiled a chronology of Earth by adding up the generations named in the Bible. He determined that Earth was created the night before October 23, BC.

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Dinosaurs disappeared about 65 million years ago. That corn cob found in an ancient Native American fire pit is 1, years old. How do scientists actually know these ages? Geologic age dating—assigning an age to materials—is an entire discipline of its own. In a way this field, called geochronology, is some of the purest detective work earth scientists do.

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Radioactive decay[ edit ] Example of a radioactive decay chain from lead Pb to lead Pb. The final decay product, lead Pb , is stable and can no longer undergo spontaneous radioactive decay. All ordinary matter is made up of combinations of chemical elements , each with its own atomic number , indicating the number of protons in the atomic nucleus. Additionally, elements may exist in different isotopes , with each isotope of an element differing in the number of neutrons in the nucleus. A particular isotope of a particular element is called a nuclide.

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Geologic Age Dating Explained

Paleomagnetic dating[ edit ] A sequence of paleomagnetic poles usually called virtual geomagnetic poles , which are already well defined in age, constitutes an apparent polar wander path APWP. Such a path is constructed for a large continental block. APWPs for different continents can be used as a reference for newly obtained poles for the rocks with unknown age. For paleomagnetic dating, it is suggested to use the APWP in order to date a pole obtained from rocks or sediments of unknown age by linking the paleopole to the nearest point on the APWP.

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