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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.

With absolute age dating, you get a real age in actual years.

Trying to date vintage Shalimar and navigating e Bay to find a bottle of the version that you prefer might seem, at first glance, to be an exhausting, frustrating, and complicated ordeal.

However, there are some basic guidelines to make things much simpler.

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.

In a way this field, called geochronology, is some of the purest detective work earth scientists do.