Dating archeological eras

As a member, you'll also get unlimited access to over 70,000 lessons in math, English, science, history, and more.Plus, get practice tests, quizzes, and personalized coaching to help you succeed.But fossil evidence isn't the only information we rely on.As you'll see in other lessons, the geologic time scale arises from an in-depth study of the trends in rock strata, like how the layers are arranged and how they are composed of certain chemicals.The Precambrian goes from the formation of the earth to the time when multicellular organisms first appeared - that's a really long time - from 4,500 million years ago to just about 543 million years ago.Then begins the Phanerozoic eon, which continues up to today.

Our current epoch is the Holocene epoch; it only started about 12,000 years ago.Okay, now let's go ahead and check out the major divisions of the geologic time scale. An eon, the largest division of the geologic time scale, spans hundreds to thousands of millions of years.Geologists generally agree that there are two major eons: the Precambrian eon and the Phanerozoic eon.The geologic time scale is broken up into larger and smaller subdivisions, which help us get a better sense of how historical events fit together.So, in this lesson, we're going to learn how the time scale was created and how its major subdivisions fit together to tell the story of Earth's history.

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