Relative dating cross section

In the geologic record , the K—Pg event is marked by a thin layer of sediment called the K—Pg boundary , which can be found throughout the world in marine and terrestrial rocks. The boundary clay shows unusually high levels of the metal iridium , which is more common in asteroids than in the Earth's crust. Other causal or contributing factors to the extinction may have been the Deccan Traps and other volcanic eruptions, [19] [20] climate change , and sea level change. A wide range of species perished in the K—Pg extinction, the best-known being the non-avian dinosaurs.

1. Relative age dating

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Geologic Age Dating Explained

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Chronological dating , or simply dating , is the process of attributing to an object or event a date in the past, allowing such object or event to be located in a previously established chronology. This usually requires what is commonly known as a "dating method". Several dating methods exist, depending on different criteria and techniques, and some very well known examples of disciplines using such techniques are, for example, history , archaeology , geology , paleontology , astronomy and even forensic science , since in the latter it is sometimes necessary to investigate the moment in the past during which the death of a cadaver occurred. Dating methods are most commonly classified following two criteria: relative dating and absolute dating.
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