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Potassium argon is a radiometric dating method that involves
However, because of severe dating problems which are seldom mentioned, this alleged sequence cannot be maintained.
However, the real seriousness of this problem seems to elude them, even when they occasionally refer to it in their writings. In the past 15 years, the major focus of human evolution has shifted from the origin of "all" humans to the origin of "modern" humans, and the very time during which modern humans are alleged to have evolved from their more primitive human ancestors is the period covered by this gap.
At least 406 human-fossil individuals are placed by evolutionists in this 40,000-to-200,000 ya time-period gap and hence are questionably dated. The inability of the radiocarbon and the K-Ar methods to cover this time period explains why many alternate dating methods have been devised to attempt to give coverage in this area.
Twenty-eight of them (44%) fall within this time gap.
Nineteen of the 222 Homo erectus fossil individuals (9% of the total) likewise fall into this time gap.
In all, 406 human-fossil individuals which evolutionists feel are crucial in documenting the evolution of modern humans fall into the gap between radiocarbon and K-Ar dating and hence have uncertain ages.
Creationists have noted an interesting pattern in evolutionist writings regarding the dating of fossils.(Anatomically modern Homo sapiens fossils that are dated more recently than 40,000 years of age are not of great significance for evolutionary purposes and are not under consideration here.) There are four Neanderthal fossil individuals that are dated more recently than 40,000 years.They are the Amud I and Shukbah remains from Israel and the Saint-Cesaire and Arcy-sur-Cure remains from France.It covers roughly the period known as the Middle Stone Age (MSA).This coverage gap lies beyond what is considered the effective range for radiocarbon and prior to what is considered the effective range for potassium-argon.Evolution places severe demands upon fossils used to support it.A fossil in an evolutionary sequence must have both the proper morphology (shape) to fit that sequence and an appropriate date to justify its position in that sequence.Popular presentations of human evolution show a rather smooth transition of fossils leading to modern humans.The impression given is that the dating of the individual fossils in that sequence is accurate enough to establish human evolution as a fact.This new method, announced in the journal, Science, involves racemization of amino acids in ostrich eggshell.The amino-acid method was developed some time ago for dating bone material at archaeological sites.