Why Are Dinosaurs and Trilobites Considered Index Fossils?
Aug 2025 · GM Kids Series 576 Book 369 · GOS Education Inc.
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35
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About this ebook
Index fossils help determine the age of strata where they are found.
These fossils come from creatures that lived only during certain periods in Earth's history.
So, when scientists find index fossils, they also learn about the environment those creatures lived in.
If they find dinosaur fossils, they know the rock is from the Mesozoic Era.
Index fossils help determine the age of strata where they are found.
These fossils come from creatures that lived only during certain periods in Earth's history.
So, when scientists find index fossils, they also learn about the environment those creatures lived in.
If they find dinosaur fossils, ...
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