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

Morton Hovind's YEC Arguments: A Close Look - Dave Matson Isochron Dating - Chris Stassen OEC Refutes YECs - Matt Tiscareno Radio Carbon Laboratory Info-Web - Oxford University and the University of Waikato Radiometric Dating - Robert Williams Radiometric Dating: A Christian Perspective - Roger C.

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.

Geologists draw on it and other basic principles ( to determine the relative ages of rocks or features such as faults.

Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you.

Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.