Earth's History Timeline

What happened and when did it happen.

Earth’s history started 4600 million years ago with the formation of planet Earth from the accretion disc revolving around the young Sun. About 500 million years after Earth cools and the surface solidified. Then about 3.8 billion years ago, prokaryotes or group of organisms that comprehend bacteria and archaea. This period of time is known as Hadean Eon, which is the period of start of the Earth. Then, Archean Eon comes, which is the beginning of the Earth. About 3500 million years ago, the split between bacteria and archaea occurred and about 500 million years later, Cyanobacteria, or a phylum of bacteria that obtain their energy through photosynthesis, evolved. Proterozoic Eon, or the early life occurred after. In this period, Eukaryote, or the cells contain complex structures enclosed within membranes evolve about 1850 million years ago. Then, sexual reproduction occurred about 500 million years after and the earliest fungi evolve about 700 million years later.

Then, we step into Phanerozoic Eon, or the period of well-displayed life. There are 3 Eons under Phanerozoic Eon, including Paleozoic Era, Mesozoic Era, and Cenozoic Era. During Phanerozoic Eon, about 530 million years ago, living organisms started to evolve in the oceans and the first known footprints on land were dated. First signs of teeth in fish were discovered about 410 million years ago and for 200 million more years, sharks, crabs, beetles and many other creatures evolve. During Mesozoic Era, earliest dinosaurs were found 225 million years ago and first mammals, ants, and other cells and creatures evolve. Lastly, Cenozoic Era, which is the time period between 65.5 million years ago to present, animals and plants that we know today evolve and about 2 million years ago, the first evidence of homo evolve.

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