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The deeper you dig, the older the fossils get
The oldest fossils are on the bottom--the newest are on top.
Each rock layer holds a group of fossil that's different from those
in every other layer. We use those fossils to organize rocks
into a time scale. No matter where in the world we find them, rocks with
matching groups of fossils are the same age.
Snail 15 million years old
Triceratops 66 million years old
Dimetrodon 270 million years old
Trilobite 570 million years old
