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400 BCE
Hedean Eon
4.5 billion years ago, Earth was formed. This period of 600 million years of time is called the Hedean Eon. The Moon was also formed on this era -
300 BCE
Archean Era
Archean Era, which is the period form 4-2.5 billion years ago, is when life first arise on Earth. The Earth's temperature did not reach extreme because although there's large amount of CO2 in the atmosphere, the sun was fainter. -
200 BCE
Proterozoic Era
The Proterozoic Era was from 2.5 billion-541 million years ago. In this period, oxygen had started to dramatically increase in Earth's atmosphere, and this is the era before complexed life form started to appear on Earth -
100 BCE
Paleozoic Era
The Paleozoic Era is between 540-254 million years ago. Most invertebrate groups were developed back then. The Cambrian explosion also happened back then, where most modern phyla were developed. -
50 BCE
Mesozoic Era
The Mesozoic Era was between 250-66 million years ago. During this era the supercontinent Pangaea begin to separate and eventually become individual continents. Dinosaurs also start to appear in this era, but they became extinct at the end of this era. -
1 BCE
Cenozoic Era
The Cenozoic Era was between 66 million years ago-now. The continents moved into their current positions, and mammals starts to appear and develop, human begin to appear, too.
