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For the history of evolutionary biology, see History Of Evolutionary Thought . This timeline of the evolution of life outlines the major events in the development of Life on the planet Earth . For a thorough explanatory context, see the History Of Earth , and Geologic Time Scale . The dates given in this article are estimates based on scientific evidence. In Biology , Evolution is the process by which populations of organisms acquire and pass on novel Trait s from generation to generation. Its occurrence over large stretches of time explains the origin of New Species and ultimately the vast diversity of the biological world. Contemporary species are related to each other through Common Descent , products of evolution and Speciation over billions of years. BASIC TIMELINE The basic timeline is a 4.6 Billion Year Old Earth , with (very approximately):
DETAILED TIMELINE Note that Ma means "million years ago". Hadean eon 3800 Ma and earlier. Archean eon 3800 Ma - 2500 Ma Proterozoic eon 2500 Ma - 542 Ma Phanerozoic eon 542 Ma - present The Phanerozoic eon, literally the "period of well-displayed life", marks the appearance in the fossil record of abundant, shell-forming organisms. It is subdivided into three eras, the Paleozoic, Mesozoic and Cenozoic, which are divided by major Mass Extinction s. Paleozoic era 542 Ma - 251.0 Ma Mesozoic era Cenozoic era 65.5 Ma - present SEE ALSO
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