Phanerozoic

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Phanerozoic
538.8 ± 0.2 – 0 Ma
Chronology

The Phanerozoic

fossil record. The time before the Phanerozoic, collectively called the Precambrian, is now divided into the Hadean, Archaean and Proterozoic
eons.

The time span of the Phanerozoic starts with the

myriapods and tetrapods; and the development of modern fauna dominated by vascular plants. During this time span, tectonic forces which move the continents had collected them into a single landmass known as Pangaea (the most recent supercontinent), which then separated into the current continental
landmasses.

Etymology

The term "Phanerozoic" was coined in 1930 by the American geologist George Halcott Chadwick (1876–1953),

ocean floor during the earlier Archean
eon.

Proterozoic-Phanerozoic boundary

The

Avalon Explosion, have been identified since the systematic study of those forms started in the 1950s.[8][9] The transition from the largely sessile Precambrian biota
to the active mobile Cambrian biota occurred early in the Phanerozoic.

Eras of the Phanerozoic

The Phanerozoic is divided into three

extinction of all non-avian dinosaurs, pterosaurs and marine reptiles, and features the great diversification in birds and mammals. Humans
appeared and evolved during the most recent part of the Cenozoic.

Paleozoic Era

The Paleozoic is a time in Earth's history when active complex life forms evolved, took their first foothold on dry land, and when the forerunners of all multicellular life on Earth began to diversify. There are six periods in the Paleozoic era: Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian.[10]

Cambrian Period