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Given a framework of absolute dates, they could move on to compare the cultural sequences in different areas, to investigate the cause of variation in the rates of cultural development.”“In ways that past generations of archaeologists could never have imagined, we are able to refine our knowledge not just of what happened, but when it happened.These new insights, some subtle, and some dramatic, will continue to clarify our human past.” Fossil fuels which are millions of years old are putting carbon into the atmosphere which contains no radioactive carbon and this carbon is absorbed into organic materials.There was lots of speculation about the age of these sites, but very little hard data regarding their antiquity.During the twentieth century, however, this changed with the development of a number of scientific methods for determining the age of an archaeological site.Radiocarbon dates are not as precise as those obtained through dendrochronology and are given in archaeological reports as estimates.Radiocarbon dates are often accompanied with a or – estimate showing the accuracy of the dated material.

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With this, materials up to 100,000 years old can be dated.Archaeology in the United States is often said to have started in 1764 when amateur archaeologist Thomas Jefferson had his African slaves dig up hundreds of Monacan skeletons so that he could learn more about their mortuary customs.During the next century and a half, many ancient American Indian sites would be dug up by archaeologists, both amateur and professional, who were unable to determine the actual age of these sites.First, only materials which were once alive—wood, plant matter, bones, etc.—can be used. Second, it is generally used to date materials less than 40,000 years old.Beyond this time, the amount of remaining radioactive carbon is so small that it is difficult to measure.

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