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The fact that geologists had determined that the earth was more than "thousands" of years old well before Origin of the Species was published is inconvenient to creationists, so they ignore it. As far as they are concerned, the "more than 6000 (or 10000) year-old universe" worldview came about specifically to accomidate the theory of evolution, and no amount of "fact" or "reality" is going to change that.