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1-16 (emphasis added).] It is questionable whether there is any reliable way to determine the speed at which many sediments were deposited.

A number of anomalous isochrons have been reported in the literature and various terms have been invented, such as apparent isochron, mantle isochron and pseudoisochron, secondary isochron, inherited isochron, source isochron, erupted isochron, mixing line, and mixing isochron.

Examples of recent downscales: John Horgan, “Blame It on the Moon: Australian ‘Solar Varves’ Turn Out to be Mostly Lunar,” Scientific American, Vol.

The isochron method, which was thought by many to be quite reliable, has come under increasing suspicion.

The basic theory of radiometric dating is briefly reviewed.