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We'll even visit the Grand Canyon to solve the mystery of the Great Unconformity!

Learn how inclusions and unconformities can tell us stories about the geologic past.Geologists establish the age of rocks in two ways: numerical dating and relative dating.Numerical dating determines the actual ages of rocks through the study of radioactive decay.Since certain species of animals existed on Earth at specific times in history, the fossils or remains of such animals embedded within those successive layers of rock also help scientists determine the age of the layers.Similarly, pollen grains released by seed-bearing plants became fossilized in rock layers.It only sequences the age of things or determines if something is older or younger than other things.