What are the geological eras?

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From Precambrian eon (between 4560 and 550 million years ago), during which life appeared on Earth, there are three major geologic eras within the Phanerozoic eon, which began 550 million years ago with the emergence of organisms above: the Paleozoic Era, the Mesozoic and Cenozoic. The first lasted from 550 million years ago to 250 million. The second is to say, the Mesozoic, was between 250 and 65 million years ago. Finally, the Cenozoic that began with the end of the Mesozoic and continues today. In turn, the Paleozoic is divided into six periods: the Cambrian (550 to 510 million years ago), Ordovician (510-439000000), the Silurian (439-408000000), the Devonian (408-362000000) the Carboniferous (362-290000000) and Permian (290-250000000). The Mesozoic comprises the Triassic (250 208 million), Jurassic (208-146000000) and Cretaceous (146 to 65 million years ago). Includes the Cenozoic Era Tertiary Period (65 to 1.6 million) and the Quaternary (starting 1.6 million years ago and continues today.

When the continents were formed?

In the Triassic, most of the landmass formed a single supercontinent: Pangaea. In the Jurassic, the continent (as a result of clashes between the plates of the Earth) began to split, and late Cretaceous the continents had taken almost its present form.

What appeared was the first of the continents?

Gondwana continents first appeared during the Paleozoic era, in the Cambrian period, following clashes between the plates of the Earth.

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