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Continue Reading Relative dating observes the placement of fossils and rock in layers known as strata.Basically, fossils and rock found in lower strata are older than those found in higher strata because lower objects must have been deposited first, while higher objects were deposited last.There are two basic approaches: relative age dating, and absolute age dating.Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you.Say for example that a volcanic dike, or a fault, cuts across several sedimentary layers, or maybe through another volcanic rock type.

On the other hand, the half-life of the isotope potassium 40 as it decays to argon is 1.26 billion years.

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

It’s based either on fossils which are recognized to represent a particular interval of time, or on radioactive decay of specific isotopes. Based on the Rule of Superposition, certain organisms clearly lived before others, during certain geologic times.

Yet, you’ve heard the news: Earth is 4.6 billion years old. That corn cob found in an ancient Native American fire pit is 1,000 years old. Geologic age dating—assigning an age to materials—is an entire discipline of its own.

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

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    For all you know, a more mature woman could have had the craziest sexual history compared to your very own.

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