How to determine the relative ages of rocks through evidence from rock formations and fossil evidence in the Earth's history.
How to determine the relative ages of rocks.
A video lesson on the law of superposition, which is used to determine the relative ages of rocks. Courtesy of bozemanbiology.
Students take an informational tour to gain a basic understanding of geologic time, the evidence for events in Earth’s history, relative and absolute dating techniques, and the significance of the Geologic Time Scale.
Reviews how to determine the relative ages of rocks.
A list of student-submitted discussion questions for Determining Relative Ages.
The John Day Fossil Beds in eastern Oregon have a weath of fossils that span a long period of time. The relative ages are well constrained becauase a volcanic ash has been radiometrically dated.
Explores the rock units of the Grand Staircase and the geologic history they reveal.
Learn about the Precambrian rocks of the Grand Canyon Supergroup and what they reveal about the ancient Earth.
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