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The narrower a range of time that an animal lived, the better it is as an index of a specific time.No bones about it, fossils are important age markers.That’s because zircon is super tough – it resists weathering. Each radioactive isotope works best for particular applications.The half-life of carbon 14, for example, is 5,730 years.
You might have noticed that many of the oldest age dates come from a mineral called zircon.
Pretty obvious that the dike came after the rocks it cuts through, right?
With absolute age dating, you get a real age in actual years.
For example, which is older, the bricks in a building or the building itself?
Are there repairs or cracks in the sidewalk that came after the sidewalk was built?