History of radiocarbon dating
Archaeology became established as a formal discipline in the 19th and early 20th centuries.
Archaeological studies have also provided much information about the people who first arrived in the Americas over 12,000 years ago.
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.
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