Geological timescale

The geological time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of Earth. The table of geologic periods presented here agrees with the dates and nomenclature proposed by the International Commission on Stratigraphy, and uses the standard color codes of the United States Geological Survey.
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The period between the origin of earth (4,500 Mya) and the beginning of the Cambrian period (540 Mya) is called Precambrian. The last 540 million years are divided into three eras: Palaeozoic (540-245 Mya); Mesozoic (245-65 Mya); Cainozoic. The geological periods are as follows: Vendian (immediately before the Cambrian; 610-540 Mya); Cambrian (540-510 Mya); Ordovician; Silurian; Devonian; Carboniferous; Permian; Triassic / Jurassic / Cretaceous (altogether the Mesozoic Era); Tertiary (65-1.64 Mya) and Quaternary. See the geological table in BBC Education.