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What would our geologist have thought if the date from the lab had been greater than 200 million years, say 350.5 ± 4.3 million years?Would he have concluded that the fossil date for the sediments was wrong? Would he have thought that the radiometric dating method was flawed? Instead of questioning the method, he would say that the radiometric date was not recording the time that the rock solidified.On his return, he sends his sample to the laboratory for dating, and after a few weeks receives the lab report.

This allowed them to increase the precision of radiocarbon dating of each period to 76, 53, and 24 years, respectively. The New Kingdom, which starts with the reign of Ahmose, began between about 15 B. Previous radiocarbon dating suggests that the eruption took place at least 100 years before the New Kingdom began, which the new dating puts at no earlier than 1570 B. Bietak says that although the new study is a "serious and innovative approach," the team's need to use Bayesian statistics to narrow its radiocarbon date ranges "expose[s] the weakness of radiocarbon chronology." But Sturt Manning, an archaeologist at Cornell University, says that the field must now accept that "there is something wrong" with the stratigraphy and dating of the site of Tell el-Dab'a rather than the chronology as a whole.

Such an interpretation fits nicely into the range of what he already believes the age to be.

In fact, he would have been equally happy with any date a bit less than 200 million years or a bit more than 30 million years.

He may suggest that the rock contained crystals (called xenocrysts) that formed long before the rock solidified and that these crystals gave an older date.

He may suggest that some other very old material had contaminated the lava as it passed through the earth.