Rock relative dating to determine fault

Posted by / 20-Nov-2015 11:22

There are two basic approaches: relative age dating, and absolute age dating.

The age of formations is marked on a geologic calendar known as the geologic time scale.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.With absolute age dating, you get a real age in actual years.Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.

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To determine the relative age of different rocks, geologists start with the assumption that unless something has happened, in a sequence of sedimentary rock layers, the newer rock layers will be on top of older ones. This rule is common sense, but it serves as a powerful reference point.

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