Margin of error in radiocarbon dating

Archaeology became established as a formal discipline in the 19th and early 20th centuries.

At that time, most archaeological work was confined to Europe, to the so-called cradle of civilization in southwestern Asia, and to a few areas of the Americas.

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Archaeological studies have also provided much information about the people who first arrived in the Americas over 12,000 years ago.

Archaeology plays a major role in the study of early civilizations, such as those of the Sumerians of Mesopotamia, who built the city of Ur, and the ancient Egyptians, who are famous for the pyramids near the city of Giza and the royal sepulchers (tombs) of the Valley of the Kings at Thebes.

Other sites that represent great human achievement are as varied as the cliff dwellings of the ancient Anasazi (a group of early Native Americans) at Mesa Verde, Colorado (see Mesa Verde National Park); the Inca city of Machu Picchu high in the Andes Mountains of Peru; and the mysterious, massive stone portrait heads of remote Easter Island in the Pacific.

Laetoli even reveals footprints of humans from 3.6 million years ago.

Some sites also contain evidence of the earliest use of simple tools.

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