Radioactive dating facts

The excavator might employ relative dating, using objects located stratigraphically (read: buried at the same depth) close to each other, or he or she might compare historical styles to see if there were similarities to a previous find.But by using these imprecise methods, archeologists were often way off.It is assumed that the ratio has been constant for a very long time before the industrial revolution.Is this assumption correct (for on it hangs the whole validity of the system)?An examination of sedimentary rocks worldwide shows a striking consistency with the unimaginably massive Flood that wiped out whole environments.

Archaeologists can then measure the amount of carbon-14 compared to the stable isotope carbon-12 and determine how old an item is.

This idea is advanced, for example, in The Young Earth: C ratio was like before the industrial revolution, and all radiocarbon dating is made with this in mind.

How do we know what the ratio was before then, though--say, thousands of years ago?

The resulting rock strata may harbor fossils from a particular habitat area or ecosystem, but do not represent a particular age or era.

Why else do we find marine fossils on the tops of all the major mountain ranges?

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