Name the four eras of the history of life on earth. give one defining piece of information about each.

Progressing from the oldest to the current, the four major eras of Earth's geological history are Precambrian, Paleozoic, Mesozoic and Cenozoic.

Precambrian: Highlights include the formation of the oceans, the development of the atmosphere and, of course, the evolution of life.

Paleozoic: Highlights include the colonization of the land by plants and animals and the evolution of sharks, fish, insects, spiders, amphibians, ancestral reptiles, ferns and early conifers.

Mesozoic: Mesozoic covers the reign of Dinosaurs. Other new life forms of this Era include turtles, crocodiles, ancestral birds, primitive mammals, flowering plants, snakes, lizards and social bees.

Cenozoic: The Cenozoic Era, which continues today, began 65 million years ago. This Age of Mammals has been characterized by the spread and diversification of mammals, including the appearance of bats, whales and primates. Man belongs to the latter group but did not appear until 140,000 years ago.

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