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Dating geological formations

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Republish our articles for free, online or in print, under Creative Commons licence. Covering two thirds of South Africa the Karoo Basin , visually, is a beautiful space. When looking more deeply into its rock layers, like leafing through the pages of a book, one can read about a wealth of palaeoevinromental and biological processes. The Karoo Basin is an invaluable archive of information over its million year depositional history. Rich in fossils, both plants and animals, the Karoo Basin records crisis periods — mass extinction events — in the distant past when many species became extinct.
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Radiometric Dating and the Geological Time Scale

They are a feature of stratified rocks, and are therefore usually found in sediments but may also occur in stratified volcanics. They are surfaces between two rock bodies that constitute a substantial break hiatus in the geologic record sometimes people say inaccurately that "time" is missing. Unconformities represent times when deposition stopped, an interval of erosion removed some of the previously deposited rock, and finally deposition was resumed. The sequence of events is summarized in the pictures at left. First: subsidence and sediment deposition occurs; Second: rocks are uplifted and tilted deformation ; Third: erosion removes the uplifted mountain range; Fourth: subsidence occurs, the sea covers the land surface, and new sediments deposition occurs on top the previous land surface.
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Telling Time at Grand Canyon National Park

It is not about the theory behind radiometric dating methods, it is about their application , and it therefore assumes the reader has some familiarity with the technique already refer to "Other Sources" for more information. As an example of how they are used, radiometric dates from geologically simple, fossiliferous Cretaceous rocks in western North America are compared to the geological time scale. To get to that point, there is also a historical discussion and description of non-radiometric dating methods.
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Geologists do not use carbon-based radiometric dating to determine the age of rocks. Carbon dating only works for objects that are younger than about 50, years, and most rocks of interest are older than that. Carbon dating is used by archeologists to date trees, plants, and animal remains; as well as human artifacts made from wood and leather; because these items are generally younger than 50, years. Carbon is found in different forms in the environment — mainly in the stable form of carbon and the unstable form of carbon Over time, carbon decays radioactively and turns into nitrogen.
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