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    Geologic time relative dating cook from skins dating

    Relative geologic age is established, based on such evidence as the order in which layers of sediment are stacked, with the younger layer originally on top.By using the principles of relative geologic age, the sequence of geologic events -- what happened first, what happened next, what happened last -- can be established.Absolute geologic age refers to how long ago a geologic event occurred or a rock formed, in numeric terms, such as 65.5 million years ago.Some rocks and minerals can have their absolute age directly measured by analyzing the ratios of certain radioactive and non-radioactive isotopes they contain.The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time, and 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, agrees with the nomenclature, dates and standard color codes set forth by the International Commission on Stratigraphy.Within the context of the Phanerozoic Eon, geologists beginning in the late 1700's recognized that fossils appeared in an orderly fashion in stratigraphic units.Moreover, these geologists recognized that the fossilized biota demonstrated rather large changes in overall composition and showed both similarities with, and differences from living taxonomic groups.

    Stratigraphy uses the assumption that higher layers or strata were laid down after lower layers.Evidence from radiometric dating indicates that Earth is about 4.54 billion years old.The geology or deep time of Earth's past has been organized into various units according to events which took place in each period.The majority of fossil organisms, however, did not match with modern groups; this led to the classification of three major eras within the period of time when the Earth's surface was populated with advanced life forms.These eras were referred to as the Paleozoic (meaning ancient life), the Mesozoic (meaning middle life), and the Cenozoic (meaning recent life) based on their relative similarity with modern taxa.

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