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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.
This problem period may be even larger because: (1) some dating authorities believe that the effective range for K-Ar doesn't begin until about 400,000 ya, and (2) many of the older fossils are found at sites that lack the volcanic rocks necessary for K-Ar dating and hence cannot be dated by this method at all.
Although young-earth creationists challenge the legitimacy of all of the dates obtained by the long-term radiometric methods, even evolutionists are beginning to admit that this dating gap presents a problem for them.
However, these alternative methods have serious problems of their own.
Of the 84 anatomically modern Homo sapiens fossil individuals dated by evolutionists beyond 40,000 years, 59 of them (70%) fall into this 40,000-to-200,000 ya gap.
All other Neanderthal remains, some 300 fossil individuals, or approximately 98.6% of all of the Neanderthals, fall into the period covered by this gap.
Only when they feel they have devised a better method for a specific time period, do they publicly admit the weaknesses of the method they had been using previously.
Anyone familiar with the paleoanthropological literature knows that this is not the way most of the dates for fossil discoveries in that time period have been presented.
This time period is critical for human evolution, and evolutionists have consistently claimed a degree of certainty in their dating which now appears to be unjustified.
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.