Geological time scale used by geologists and scientists to explain time and relationships between events that occurred throughout the history of Earth. Table geological periods are shown on this page are adapted to time and nomenclature proposed by the International Commission on Stratigraphy, and uses a standard color code of the United States Geological Survey.Evidence from radiometric dating indicates that Earth was about 4570 million years. Geologic time the Earth organized into several units according to events that occurred in each period. Each day on the time scale is usually marked with large geological or paleontological events, such as mass extinctions. For example, the boundary between the Cretaceous and Paleogene extinction event is defined by baerbagai dinosaurs and marine species. Period of older, fossil relic that has no reliable estimate of age, defined by absolute age.
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