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The earth formed about 4.54 billion years ago.
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Earth's crust cooled down enough to allow the formation of continents and life began its development. During this period of time, the moon also collided with the earth, the collision made a huge impact on the climate, oceans, and life on Earth.
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During this eon, oxygen appeared and which made the earth suitable for complex life.
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At the start of the era, the first supercontinent broke up, and throughout this period of time, plants became very widespread and the first kind of vertebrate animal colonized land.
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This era starts and ends with two mass-distinctions. This era also includes 3 more specific periods called the Triassic, Jurassic, and Cretaceous periods.
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The start of this era was the demise of the dinosaurs caused by the hit of the6-miles wide asteroid. This caused the temperature to drop extremely.