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We also have fair agreement between our radiocarbon dates and historical dates for the Middle Kingdom.

We then compared our results with the mid-point dates of the kings to whom the monuments belonged (Cambridge Ancient History, 3rd ed.).

The average radiocarbon dates were 374 years earlier than expected.

By measuring how much C14 remains in a sample of organic material, we can estimate its age within a range of dates.

Samples older than 50,000 to 60,000 years are not useful for radiocarbon testing because by then, the amount of C14 remaining is too small to be dated.

The number of dates from the two projects was only large enough to allow for statistical comparisons for the pyramids of Djoser, Khufu, Khafre, and Menkaure. First, there are significant discrepancies between the 19 dates for Khufu and Khafre, but not for Djoser and Menkaure.

Second, the 1995 dates vary widely even for a single monument.

Archaeologists believe Egypt’s large pyramids are the work of the Old Kingdom society that rose to prominence in the Nile Valley after 3000 B. Historical analysis tells us that the Egyptians built the Giza Pyramids in a span of 85 years between 25 BC.

Interest in Egyptian chronology is widespread in both popular and scholarly circles.

But material from the time of the pyramids lends itself well to radiocarbon dating because they fall into the 2575-1640 date range.

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