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Geologic time scale dating

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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. A common form of criticism is to cite geologically complicated situations where the application of radiometric dating is very challenging.

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Radiometric age dating techniques were used to establish the relative geologic time scale

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Geologic Time: Radiometric Time Scale

September 30, by Beth Geiger. 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?
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Divisions of Geologic Time

The geologic time scale GTS is a system of chronological dating that relates geological strata stratigraphy to time. It is used by geologists , paleontologists , and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history. The table of geologic time spans, presented here, agree with the nomenclature , dates and standard color codes set forth by the International Commission on Stratigraphy ICS. The primary defined divisions of time are eons , in sequence the Hadean , the Archean , the Proterozoic and the Phanerozoic.
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We often express time in hours or days, and 10 or 20 years certainly feels like a long time. Imagine if you needed to think about one million, million, or even several billion years. These exceptional lengths of time seem unbelievable, but they are exactly the spans of times that scientists use to describe the Earth. Have places like the Grand Canyon and the Mississippi River been around for all of those years, or were they formed more recently?
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