The Phanerozoic Eon

(Paleozoic Era, Mesozoic Era, and the Cenozoic Era)

By Rachel Greif and Alyssa McCandlish

Earth's Atmosphere

The Earth's atmosphere during the Phanerozoic Eon was full of free oxygen that had been produced by plants during photosynthesis. This free oxygen in the air allowed animals and other plants to exist.

The Paleozoic Era

Major Events:

During the Paleozoic Era, the Appalachian Mountains were formed and coal swamps were developed.

Life Forms:

During the Paleozoic Era, insects, amphibians, fish, land plants, and reptiles existed. Some specific examples of these life forms are the Brachiopod and Trilobites.

The Mesozoic Era

Major Events:

During the Mesozoic Era, the Rocky Mountains were formed.

Life Forms:

During the Mesozoic Era, dinosaurs, flowering plants, birds, and mammals all existed. Some specific examples are Pterosaurs, Cycads, and conifers.

The Cenozoic Era

Major Events:

During the Cenozoic Era, the Ice Age occurred, the Great Lakes formed, the Grand Canyon was shaped and the Dinosaurs became extinct.

Life Forms:

During the Cenozoic Era, huge rhinoceroses, three-toed horses, diatrymas, mammoths, saber-toothed tigers, and humans roamed the earth.


* These are all of the citations for every part of the project

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