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Archaeology is an important field of anthropology, which is the broad study of human culture and biology.Archaeologists concentrate their studies on past societies and changes in those societies over extremely long periods of time.

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Archaeologists have also recorded how primitive forms of humans spread out of Africa into Asia about 1.8 million years ago, then into Europe about 900,000 years ago.

The first physically modern humans, Homo sapiens sapiens, appeared in tropical Africa between 200,000 and 150,000 years agodates determined by molecular biologists and archaeologists working together.

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.

The earliest subjects of archaeological study date from the origins of humanity.

These include fossil remains believed to be of human ancestors who lived 3.5 million to 4.5 million years ago.Today, archaeologists study the great cultural diversity of humanity in every corner of the world.Archaeological study covers an extremely long span of time and a great variety of subjects.The archeological record encompasses every area of the world that has ever been occupied by humans, as well as all of the material remains contained in those areas.Archaeologists study the archaeological record through field surveys and excavations and through the laboratory study of collected materials.Laetoli even reveals footprints of humans from 3.6 million years ago.

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