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Ancient history has been divided up into eras, which are periods of time identified by the fossilized forms of life from that period. The oldest era, called the Paleozoic, contains fossils ranging from many primitive life forms up to some of the earliest land-dwelling animals.

During this era, fishes, amphibians and early reptiles appeared. The Mesozoic era was the age of giant reptiles, when dinosaurs stalked the world.

The Cenozoic era in which we still live is the age of mammals and b read more...

Tags: ancient, fossils, age

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