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Trilobite fossils are found worldwide, with many thousands of known species. Because they appeared quickly in geological time, and moulted like other arthropods, trilobites serve as excellent index fossils, enabling geologists to date the age of the rocks in which they are found.
Model created by [Marissa Dudek](https://sketchfab.com/marissadudek). This model has been used under a [Creative Commons Attribution license](https://creativecommons.org/licenses/by/4.0/legalcode).
