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Their logic (which is wrong) goes like this: Fossils are x millions of years old because they are in this rock layer.
In fact, he specifically states that if you use age to define the fossils, you can’t use them for dating the rock. This is just the latest in another long line creationist misrepresentation. First, you need a type of fossil that is common, widely distributed, and easily identified at the species level.An isotope is a particular type of atom of a chemical element, which differs from other isotopes of that element.The different numbers of neutrons possible in the atoms of a given element correspond to the different possible isotopes of that element. Carbon-12 is the isotope of carbon that has 6 neutrons.Creationists have long insisted that the main evidence for evolution — the fossil record — involves a serious case of circular reasoning.That is, the fossil evidence that life has evolved from simple to complex forms over the geological ages depends on the geological ages of the specific rocks in which these fossils are found.
They no longer ignore it or pass it off with a sarcastic denial, but admit that it is a real problem which deserves a serious answer. which starts from a chronology of index fossils, and imposes them on the rocks.