This article reports on new age dates for Clovis sites. It may be of interest to your readers that the dates given (11,050 to 10,900 years ago) are in “radiocarbon years” and are not in real or “calendar years.” As a result of variations in the production of carbon-14 in the atmosphere through time, radiocarbon years have a certain percentage of error, depending on age and type of material. For example, the radiocarbon date of 11,000 years is actually equal to approximately 13,000 calendar years.

Bruce Bartleson
Gunnison, Colo.

From the Nature Index

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