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Precambrian Time: 4600-542.0 mya

Precambrian, meaning being the earliest era of geologic history

Having no plants or animals, only rock, desert, water and ice

Significant events: being latter Precambrian, heat dissipated enough to allow the continental crust to form; crustal rifting, mountain building, and volcanic activity then dominated,

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Paleozoic Era: occurring between 570-240 mya

Paleozoic: meaning ancient life

Animals, life: Included marine life such as trilobites, fish, and sea sponges, Land life also evolved such as amphibians and reptiles.

Significant events: Six periods, the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian

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Mesozoic Era: 251.0-65.5 mya

Mesozoic, means 'middle life' this is the time of the dinosaurs. It ended with a massive meteorite impact that caused a mass extinction, wiping out the dinosaurs and up to 80% of life on Earth.

The early Mesozoic was dominated by ferns, cycads, ginkgophytes, and other unusual plants.

Having dinosaurs, specific types being Triceratops, Stegosaurus, Velociraptor

Significant events: The Appalachians were subjected to erosion, the products of which were deposited along the Atlantic coast. Also Flying reptiles and birds first appeared during the Mesozoic Era.

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Cenozoic Era: 65.5 mya to present

The most recent of the subdivisions of animal history

Having Ferns, horsetails, and shrubby flowering plants

Having mammals, fish, birds

Significant events: mass extinction, the rise of mammals, changes in the climate, and the movements of the continents into their present position.