Earth's geological history: the Phanerozoic eon

Earth's geological history: the Phanerozoic eon


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The Phanerozoic eon it is a division of the geological timescale that spans 541 million years to the present, characterized by abundant plant and animal life.

Its beginning occurs in Cambrian period, when the first hard-shelled animals appear, and their name derives from the ancient Greek words φανερός (phanerós), which means "visible", and ζῷον (zôon), which means "living being", and which together mean "Visible life".

The term "Phanerozoic" was adopted in 1930 by the American geologist George Halcott Chadwick (1876-1953), being the successor to the Precambrian supereon, which includes the Hadic, Archaic and Proterozoic eons.

The length of time the Phanerozoic eon begins with what would be the rapid appearance of a series of phyla (type of organization located between the kingdom and the class used in the animal kingdoms) of animals, their own evolution in various forms, the development of complex plants, the evolution of the fish, the appearance of insects and tetrapods and the development of modern fauna.

During this period of time, tectonic forces caused the continents to move and eventually coalesce into a single landmass: the supercontinent Pangea, which separated into today's continental masses.

You were of the Phanerozoic eon

The Phanerozoic eon is divided into three epochs, Paleozoic, Mesozoic and Cenozoic, which in turn are subdivided into 12 periods:

Paleozoic era

  • Cambrian
  • Ordovician
  • Silurian
  • Devonian
  • Carboniferous (Mississippian and Pennsylvania)
  • Permian

Mesozoic era

  • Triassic
  • Jurassic
  • Cretaceous

Cenozoic era

  • Paleogene
  • Neogene
  • Quaternary

Image: Shutterstock

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