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The phanerozoic eon is divided into three eras namely the Paleozoic, the Mesozoic, and the Cenozoic. Most of the new-age organisms that emerged from species are now extinct.įirst grasses, grasses started dominating the landįirst plant and fungi begin growing on land

Life steadily became more diversified and new species developed. The phanerozoic timeline given below shows some of the life forms that developed during the phanerozoic era. The phanerozoic eon definition states that it is the interval of geologic time spanning from the appearance of abundant, macroscopic, hard-shelled fossils, approximately 542 million years ago (mya) to the present time. The Phanerozoic eon era includes the instant evolution of several animal phyla, the evolution of terrestrial plants, complex plants, fish, and terrestrial animals, and the development of modern faunas and human beings. The term “ phanerozoic” was first introduced by the American geologist George Halcott Chadwick (1876–1953). The term phanerozoic is derived from the Ancient word φανερός (phanerós) meaning visible and ζωή (zōḗ) meaning life, as it was once believed that the life began in Cambrian, the first period of the phanerozoic eon. During the phanerozoic eon, the tectonic force which moved into the continent had collected them into a single landmass known as the Pangea (the most latest continent) which then further divided into current continental landmasses. The plant life on land appeared early in the phanerozoic era. The period of the phanerozoic eon starts with the instant appearance of the fossilized evidence of several animals phyla, the evolution of those phyla into different forms, the development and emergence of complex plants, the evolution of fish, insects, and tetrapods, and also the development of modern fauna. The time before the phanerozoic era is known as the Precambrian and is divided into Haiden, Arches, and Proterozoic eras. The phanerozoic era begins with the Cambrian period when animals initially developed hard shells preserved in the fossil record. The phanerozoic period covered 541 million years to the present. The phanerozoic eon is the present geological eon in the geological time scale and the era during which abundant plant and animal life have existed. Phanerozoic eon means the eon comprising the Paleozoic, Mesozoic, and Cenozoic eras.