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The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time

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n geology and related fields, a stratum (plural: strata) is a layer of sedimentary rock or soil, or igneous rockthat were formed at the earth's surface, with internally consistent characteristics that distinguish it from other layers.

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1. an idealized cycle of processes undergone by rocks in the earth's crust, involving igneous intrusion, uplift, erosion, transportation, deposition as sedimentary rock, metamorphism, remelting, and further igneous intrusion.

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the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock

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the time required for any specified property (e.g., the concentration of a substance in the body) to decrease by half.

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Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.

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Radiocarbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.

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Radioactive decay (also known as nuclear decay of radioactivity) is the process by which an unstable atomic nucleus loses energy